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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : PARLINSKI K., CURRAT R., VETTIER C., ALEKSANDROVA I. P., ECKOLD G.
Заглавие : Effect of hydrostatic-pressure on modulated phases in Rb2ZnBr4
Разночтения заглавия :авие SCOPUS: Effect of hydrostatic pressure on modulated phases in Rb2ZnBr4
Место публикации : Phys. Rev. B. - 1992. - Vol. 46, Is. 1. - P.106-114. - ISSN 0163-1829, DOI 10.1103/PhysRevB.46.106
Примечания : Cited References: 36
Предметные рубрики: INCOMMENSURATE PHASES
NEUTRON-SCATTERING
X-RAY
COMMENSURATE
TRANSITIONS
EVOLUTION
MODEL
WAVE
Аннотация: Neutron-diffraction studies on modulated Rb2ZnBr4, carried out under hydrostatic pressure, revealed two new commensurate phases characterized by wave vectors q = 2/7b* and q = 1/4b*, respectively. The first order phase transition between them is revealed by the coexistence of two distinct peaks in the diffraction pattern. The observed pressure-temperature phase diagram contains: the above-mentioned phases, the ferroelectric commensurate phase q = 1/3, and a region characterized by wave-vector values in the interval q = 2/7-1/3. In this region the modulation wave vector exhibits stepwise behavior as a function of pressure, but remains nearly constant iii temperature runs. We have found in this region a characteristic memory effect in which two temperature runs performed at the same pressure lead to two different modulation wave-vector values, while only the thermal history of the sample is different in the two runs. At ambient pressure we confirm the presence of a multipeaked diffraction pattern just above the lock-in transition to the commensurate q = 1/3 phase. At 122 K the phase transition from the 1/3 phase to the 1/4 phase is detected in pressure scans. The transition mechanism involves the q = 2/7 phase, at least as a metastable intermediate phase.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : PANKRATS A. I., PETRAKOVSKII G. A., SABLINA K. A.
Заглавие : MICROWAVE RESONANCE-ABSORPTION IN ANTIFERROMAGNET BI2CUO4
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1994. - Vol. 91, Is. 2. - P121-124. - ISSN 0038-1098, DOI 10.1016/0038-1098(94)90267-4
Примечания : Cited References: 13
Предметные рубрики: SINGLE-CRYSTAL
NEUTRON-SCATTERING
RANGE
Аннотация: The resonance absorption in Bi2CuO4 single crystals was found in the frequency range 35-80 GHz for H(perpendicular-to)C4 Case and it was absent for H(parallel-to)C4 case. The frequency-field dependence for H(perpendicular-to)C4 case at 4.2 K is typical for easy-plane antiferromagnets with weak magnetic anisotropy in this plane. In contrast to the sublattice magnetization of Bi2CuO4 the resonance parameters depend strongly on the temperature below 20 K. Besides, the resonance field has a considerable jump at TN which ls not typical for second order phase transitions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Vorotynov A. M., Szymczak H., Gladczuk L.
Заглавие : Magnetostriction of the spin-Peierls magnet CuGeO3
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1998. - Vol. 40, Is. 9. - P1520-1522. - ISSN 1063-7834, DOI 10.1134/1.1130590
Примечания : Cited References: 12
Предметные рубрики: NEUTRON-SCATTERING
CUPRATE CUGEO3
Аннотация: The temperature dependence of the longitudinal magnetostriction of a CuGeO3 single crystal is measured within the temperature range 4.2-20 K in a magnetic field of 10 T. As the temperature is raised above 4.2 K, the magnetostriction at first increases from vanishingly small values, attains a maximum at a temperature of approximately 12 K, and then abruptly drops as the temperature approaches the spin-Peierls transition. The results are interpreted on the basis of a simple model utilizing the real pattern of magnetic excitations in the spin system. (C) 1998 American Institute of Physics. [S1063-7834(98)02309-0].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrova I. P., Ivanov Y. N., Sukhovskii A. A., Vakhrushev S. B.
Заглавие : Na-23 NMR in the relaxor ferroelectric Na1/2Bi1/2TiO3
Разночтения заглавия :авие SCOPUS: 23Na NMR in the relaxor ferroelectric Na1/2Bi 1/2TiO3
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48: 17th All-Russia Conference on the Physics of Ferroelectrics (VKS-XVII) (JUN 26-JUL 01, 2005, Penza, RUSSIA), Is. 6. - P1120-1123. - ISSN 1063-7834, DOI 10.1134/S106378340606031X
Примечания : Cited References: 8
Предметные рубрики: NEUTRON-SCATTERING
PHASE-TRANSITION
NA0.5BI0.5TIO3
Аннотация: The Na-23 NMR spectra of a Na1/2Bi1/2TiO3 crystal are studied at frequencies of 79.4 and 15.7 MHz in the temperature range 150-720 K. It is revealed that, at all temperatures, the crystal contains regions with a nearly cubic matrix and polar clusters. The temperature dependence of the local distortion of the Na environment in the clusters is determined. The dynamics of the reorientation of the local cluster polarization in the tetragonal and trigonal NBT phases is analyzed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Eremin I.
Заглавие : Theory of magnetic excitations in iron-based layered superconductors
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2008. - Vol. 78, Is. 14. - Ст.140509. - ISSN 1098-0121, DOI 10.1103/PhysRevB.78.140509
Примечания : Cited References: 31
Предметные рубрики: NEUTRON-SCATTERING
INSTABILITY
STATE
ORDER
MODEL
Аннотация: Based on the effective four-band model we analyze the spin response in the normal and superconducting states of the Fe-pnictide superconductors. While the normal-state spin excitations are dominated by the continuum of the interorbital antiferromagnetic fluctuations and the intraband spin-density wave fluctuations, the unconventional superconductivity yields different feedback. The resonance peak in the form of the well-defined spin exciton occurs only for the interband scattering at the antiferromagnetic momentum Q(AFM) for the s(+/-) (extended s wave) superconducting order parameter and it disappears rapidly for q Q(AFM). The resonance feature is extremely weak for the d(x)(2)-y(2)-wave order parameter due to the specific Fermi-surface topology of these compounds. The essential difference between s(+/-)-wave and d(x)(2)-y(2)-wave symmetries for the magnetic excitations can be used for experimental determination of the superconducting wave-function symmetry.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Argyriou D. N., Hiess A., Akbari A., Eremin I., Korshunov M. M., Hu J., Qian B., Mao Z. Q., Qiu Y. M., Broholm C., Bao W.
Заглавие : Incommensurate itinerant antiferromagnetic excitations and spin resonance in the FeTe0.6Se0.4 superconductor
Коллективы :
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 81, Is. 22. - Ст.220503. - ISSN 1098-0121, DOI 10.1103/PhysRevB.81.220503
Примечания : Cited References: 34. - Work at Tulane was supported by the NSF under Grant No. DMR-0645305 (for materials) and the DOE under Grant No. DE-FG02-07ER46358 (for graduate students). Work at JHU was funded by the DOE under Grant No. DE-FG02-08ER46544. D.N.A. benefited from helpful discussions with Jan Zaanen and Alan Goldman and thanks the DFG for support under SPP 1458. M.M.K. is grateful to P. J. Hirschfeld for useful discussions and acknowledges support from RFBR (Grant No. 09-02-00127 ), OFN RAS program on strong electronic correlations, and the Russian FCP (Grant No. NK-589P/46).
Предметные рубрики: NEUTRON-SCATTERING
Аннотация: We report on inelastic neutron-scattering measurements that find itinerantlike incommensurate magnetic excitations in the normal state of superconducting FeTe0.6Se0.4 (T-c=14 K) at wave vector Q(inc) = (1/2 +/- epsilon, 1/2 -/+ epsilon) with epsilon = 0.09(1). In the superconducting state only the lower energy part of the spectrum shows significant changes by the formation of a gap and a magnetic resonance that follows the dispersion of the normal-state excitations. We use a four band model to describe the Fermi-surface topology of this iron-based superconductors with the extended s(+/-) symmetry and find that it qualitatively captures the salient features of these data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Goryainov S. V., Laptash N. M., Vtyurin A. N., Mel'nikova S. V., Krylova S. N.
Заглавие : Influence of the molecular groups ordering on structural phase transitions in (NH4)2WO2F4 crystal
Место публикации : Cryst. Growth Des.: American Chemical Society, 2014. - Vol. 14, Is. 1. - P.374-380. - ISSN 1528-7483, DOI 10.1021/cg400899m. - ISSN 1528-7505
Примечания : Cited References: 27. - This work was partly supported by the Russian Foundation for the Basic Research project no. 12-02-00056, no. 13-02-00825, and integration project SB RAS no. 28, SS-4828.2012.2.Published as part of the Crystal Growth & Design virtual special issue Anion-controlled New Inorganic Materials.
Предметные рубрики: RAMAN-SCATTERING
NEUTRON-SCATTERING
SOLID-STATE
OXYFLUORIDES
DISORDER
POLAR
ANION
Аннотация: Phase transitions of the (NH4)2WO2F 4 crystal were studied by Raman spectroscopy in the range from 10 to 350 K. The mechanism of two phase transitions at T1 = 201 and T 2 = 160 K was proposed. The significant spectra changes occur in the range corresponding to the W-O vibrations. The first temperature phase transition is due to the ordering of the quasi-octahedral groups [WO 2F4]2- and partial ordering of ammonium groups. Experimental data allow for attributing the first (T1 = 201 K) phase transition to the first order close to the tricritical point. The noticeable changes of the Raman spectrum have been found in the range corresponding to the ammonium vibrations below the temperature T2. The second phase transition is associated with the further ordering of ammonium groups. Room temperature (296 K) experiments have been carried out under high hydrostatic pressure up to 10 GPa. Above 2 GPa, new spectral features appear, allowing for the assumption of the existence of a new high-pressure phase of (NH 4)2WO2F4, which is mainly connected with ordering of the [WO2F4]2- quasi-octahedral groups.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nikitin S. E., Wu L. S., Sefat A. S., Shaykhutdinov K. A., Lu Z., Meng S., Pomjakushina, E., V, Conder K., Ehlers G., Lumsden M. D., Kolesnikov, A., I, Barilo S., Guretskii S. A., Inosov D. S., Podlesnyak A.
Заглавие : Decoupled spin dynamics in the rare-earth orthoferrite YbFeO3: Evolution of magnetic excitations through the spin-reorientation transition
Коллективы : US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division; German Research Foundation (DFG) [SFB 1143]; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM); Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; BFFR [F18KI-022]
Место публикации : Phys. Rev. B. - 2018. - Vol. 98, Is. 6. - Ст.064424. - ISSN 2469-9950, DOI 10.1103/PhysRevB.98.064424. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 70. - We would like to thank A. Sukhanov, O. Stockert, and P. Thalmeier for useful discussions. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. Part of this work was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. D.S.I. acknowledges funding by the German Research Foundation (DFG) through the Collaborative Research Center SFB 1143 at the TU Dresden (project C03). S.E.N. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). L.S.W. was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US DOE. S.B. and S.A.G. are supported by BFFR, Grant No. F18KI-022
Предметные рубрики: MAGNON BOUND-STATES
ANTIFERROMAGNETIC CHAIN
NEUTRON-SCATTERING
Аннотация: In this paper, we present a comprehensive study of magnetic dynamics in the rare-earth orthoferrite YbFeO3 at temperatures below and above the spin-reorientation (SR) transition TSR=7.6K, in magnetic fields applied along the a,b, and c axes. Using single-crystal inelastic neutron scattering, we observed that the spectrum of magnetic excitations consists of two collective modes well separated in energy: 3D gapped magnons with a bandwidth of ∼60meV, associated with the antiferromagnetically (AFM) ordered Fe subsystem, and quasi-1D AFM fluctuations of ∼1meV within the Yb subsystem, with no hybridization of those modes. The spin dynamics of the Fe subsystem changes very little through the SR transition and could be well described in the frame of semiclassical linear spin-wave theory. On the other hand, the rotation of the net moment of the Fe subsystem at TSR drastically changes the excitation spectrum of the Yb subsystem, inducing the transition between two regimes with magnon and spinonlike fluctuations. At TTSR, the Yb spin chains have a well defined field-induced ferromagnetic (FM) ground state, and the spectrum consists of a sharp single-magnon mode, a two-magnon bound state, and a two-magnon continuum, whereas at TTSR only a gapped broad spinonlike continuum dominates the spectrum. In this work we show that a weak quasi-1D coupling within the Yb subsystem JYb-Yb, mainly neglected in previous studies, creates unusual quantum spin dynamics on the low-energy scales. The results of our work may stimulate further experimental search for similar compounds with several magnetic subsystems and energy scales, where low-energy fluctuations and underlying physics could be “hidden” by a dominating interaction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O. B., Sitnikov M. N., Kretinin V. V., Galyas, A., I, Yanushkevich, K., I
Заглавие : The alternating-sign magnetoresistance of polycrystalline manganese chalcogenide films
Коллективы : Russian Foundation for Basic Research (RFBR) [18-52-00009 Bel_a, 18-32-00079 mol_a, 18-42-240001 r_a]; [3.5743.2017/6.7]
Место публикации : Semicond. Sci. Technol. - 2018. - Vol. 33, Is. 8. - Ст.085006. - ISSN 0268-1242, DOI 10.1088/1361-6641/aace44. - ISSN 1361-6641(eISSN)
Примечания : Cited References: 33. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the research project No 18-52-00009 Bel_a; No 18-32-00079 mol_a; No 18-42-240001 r_a; the state order No 3.5743.2017/6.7.
Предметные рубрики: NEUTRON-SCATTERING
SURFACE-STATES
MNTE
CONDUCTIVITY
MECHANISM
Ключевые слова (''Своб.индексиров.''): polycrystalline films--magnetoresistance--impedance--polaron--magnetic--properties--thermoelectric
Аннотация: The correlation between the dc and ac electrical resistance and the structural, magnetic, and thermoelectric properties of polycrystalline MnSe1−X Te Х (0.3 ≤ X ≤ 0.4) manganese chalcogenide films in the temperature range of 80–400 K has been investigated. Inhomogeneous electronic states and transitions between them accompanied by structural lattice deformations have been found at temperatures including the Neel temperature region. The magnetic susceptibility maximum above the Neel temperature in a magnetic field of 8.6 kOe has been observed. Temperature ranges of the coexistence of two types of electrically inhomogeneous states have been established by impedance spectroscopy in the frequency range of 0.1–1000 kHz and the change of the hopping conductivity for diffusion one accompanied by the magnetic susceptibility minimum has been found. The magnetoresistance in magnetic fields of up to 12 kОе has been established. It has been revealed that the thermopower and magnetoresistance change its sign upon heating. The experimental data are explained using a spin polaron model with the localization of polarons and formation of the electron phase-separation. The alternation of magnetoresistance in sign is attributed to the ferromagnetic orbital ordering of electrons and the negative magnetoresistance is explained by suppression of spin fluctuations in a magnetic field.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Skorobogatov S. A., Nikitin S. E., Shaykhutdinov K. A., Balaev A. D., Terentjev K. Yu., Ehlers G., Sala G., Pomjakushina, E., V, Conder K., Podlesnyak A.
Заглавие : Low-temperature spin dynamics in the TmFeO3 orthoferrite with a non-Kramers ion
Коллективы : International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM)
Место публикации : Phys. Rev. B. - 2020. - Vol. 101, Is. 1. - Ст.014432. - ISSN 2469-9950, DOI 10.1103/PhysRevB.101.014432. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 41. - We thank A. Sukhanov for stimulating discussions and D. Abernathy for support with data acquisition. This research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. S.E.N. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). Laue x-ray diffraction measurements were conducted at the Center for Nanophase Materials Sciences (CNMS) (CNMS2019-R18) at Oak Ridge National Laboratory (ORNL), which is a DOE Office of Science User Facility
Предметные рубрики: NEUTRON-SCATTERING
REORIENTATION
VISUALIZATION
EXCITATIONS
SOFTWARE
Аннотация: We investigate the magnetic dynamics of the orthorhombic perovskite TmFeO3 at low temperatures, below the spin reorientation transition at TSR≈80 K, by means of time-of-flight neutron spectroscopy. We find that the magnetic excitation spectrum combines two emergent collective modes associated with different magnetic sublattices. The Fe subsystem orders below TN∼632 K into a canted antiferromagnetic structure and exhibits sharp, high-energy magnon excitations. We describe them using linear spin-wave theory, and reveal a pronounced anisotropy between in- and out-of-plane exchange interactions, which was mainly neglected in previous reports on the spin dynamics in orthoferrites. At lower energies, we find two crystalline electrical field (CEF) excitations of Tm3+ ions at energies of ∼2 and 5 meV. In contrast to the sister compound YbFeO3, where the Yb3+ ions form quasi-one-dimensional chains along the c axis, the Tm excitations show dispersion along both directions in the (0KL) scattering plane. Analysis of the neutron scattering polarization factor reveals a longitudinal polarization of the 2 meV excitation. To evaluate the effect of the CEF on the Tm3+ ions, we perform point-charge model calculations, and their results quantitatively capture the main features of Tm single-ion physics, such as energies, intensities, and polarization of the CEF transitions, and the type of magnetic anisotropy.
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