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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Eremin E. V., Velikanov D. A., Kartashev A. V., Vasil'ev A. D., Gudim I. A.
Заглавие : Magnetic properties of the Nd0.5Gd0.5Fe3(BO3)(4) single crystal
Разночтения заглавия :авие SCOPUS: Magnetic properties of the Nd 0.5Gd 0.5Fe 3(BO 3) 4 single crystal
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 10. - P2032-2037. - ISSN 1063-7834, DOI 10.1134/S1063783411100180
Примечания : Cited References: 19. - This study was supported by the Russian Foundation for Basic Research, project no. 09-02-00171-a.
Предметные рубрики: GDFE3(BO3)(4)
NDFE3(BO3)(4)
Аннотация: The magnetic properties of the Nd0.5Gd0.5Fe3(BO3)(4) single crystal have been studied in principal crystallographic directions in magnetic fields to 90 kG in the temperature range 2-300 K; in addition, the heat capacity has been measured in the range 2-300 K. It has been found that, below the N,el temperature T (N) = 32 K down to 2 K, the single crystal exhibits an easy-plane antiferromagnetic structure. A hysteresis has been detected during magnetization of the crystal in the easy plane in fields of 1.0-3.5 kG, and a singularity has been found in the temperature dependence of the magnetic susceptibility in the easy plane at a temperature of 11 K in fields B 1 kG. It has been shown that the singularity is due to appearance of the hysteresis. The origin of the magnetic properties of the crystal near the hysteresis has been discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hamann-Borrero J. E., Philipp M., Kataeva O., Zimmermann M. V., Geck J., Klingeler R., Vasiliev A., Bezmaternykh L. N., Buchner B., Hess C.
Заглавие : Nonresonant x-ray magnetic scattering on rare-earth iron borates RFe3(BO3)(4)
Коллективы :
Разночтения заглавия :авие SCOPUS: Nonresonant x-ray magnetic scattering on rare-earth iron borates R Fe 3(BO3)4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 82, Is. 9. - Ст.94411. - ISSN 1098-0121, DOI 10.1103/PhysRevB.82.094411
Примечания : Cited References: 38. - This work was supported by the Deustche Forschungsgemeinschaft, through the Forschergruppe FOR520 (Grant No. HE3439/6) and HASYLAB at the Feyerherm from HMI Berlin and specially to Jorg Strempfer from HASYLAB at DESY in Hamburg for valuable discussions.
Предметные рубрики: SINGLE-CRYSTALS
CROSS-SECTION
GDFE3(BO3)(4)
NDFE3(BO3)(4)
DIFFRACTION
MNF2
Аннотация: Hard x-ray scattering experiments with a photon energy of 100 keV were performed as a function of temperature and applied magnetic field on selected compounds of the RFe3(BO3)4 family. The results show the presence of several diffraction features, in particular, nonresonant magnetic reflections in the magnetically ordered phase and structural reflections that violate the diffraction conditions for the low-temperature phase P3(1)21 of the rare-earth iron borates. The temperature and field dependence of the magnetic superlattice reflections corroborate the magnetic structures of the borate compounds obtained by neutron diffraction. The detailed analysis of the intensity and scattering cross section of the magnetic reflection reveals details of the magnetic structure of these materials such as the spin domain structure of NdFe3(BO3)(4) and GdFe3(BO3)(4). Furthermore we find that the correlation length of the magnetic domains is around 100 angstrom for all the compounds and that the Fe moments are rotated 53 degrees +/- 3 degrees off from the hexagonal basal plane in GdFe3(BO3)(4).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Janoschek M., Fischer P., Schefer J., Roessli B., Pomjakushin V., Meven M., Petricek V., Petrakovskii G. A., Bezmaternykh L. N.
Заглавие : Single magnetic chirality in the magnetoelectric NdFe3((BO3)-B-11)(4)
Разночтения заглавия :авие SCOPUS: Single magnetic chirality in the magnetoelectric NdFe3( 11BO3 )4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 81, Is. 9. - Ст.94429. - ISSN 1098-0121, DOI 10.1103/PhysRevB.81.094429
Примечания : Cited References: 55
Предметные рубрики: NEUTRON-DIFFRACTION
PHASE-TRANSITIONS
SLOW-NEUTRONS
CRYSTAL
NDFE3(BO3)(4)
EXTINCTION
NUCLEAR
ORDER
MNSI
ANTIFERROMAGNETS
Аннотация: We have performed an extensive study of single crystals of the magnetoelectric NdFe3 ((BO3)-B-11)(4) by means of a combination of single-crystal neutron diffraction and spherical neutron polarimetry. Our investigation did not detect significant deviations at low temperatures from space group R32 concerning the chemical structure. With respect to magnetic ordering our combined results demonstrate that in the commensurate magnetic phase below T-N approximate to 30 K all three magnetic Fe moments and the magnetic Nd moment are aligned ferromagnetically in the basal hexagonal plane but align antiferromagnetically between adjacent planes. The phase transition to the low-temperature incommensurate (IC) magnetic structure observed at T-IC approximate to 13.5 K appears to be continuous. By means of polarized neutron studies it could be shown that in the incommensurate magnetic phase the magnetic structure of NdFe3((BO3)-B-11)(4) is transformed into a long-period antiferromagnetic helix with single chirality. Close to the commensurate-incommensurate phase transition third-order harmonics were observed, which in addition indicate the formation of magnetic solitons.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova E. A., Tristan N., Vasiliev A. N., Temerov V. L., Bezmaternykh L. N., Leps N., Buechner B., Klingeler R.
Заглавие : Magnetization and specific heat of DyFe3(BO3)(4) single crystal
Разночтения заглавия :авие SCOPUS: Magnetization and specific heat of DyFe 3(BO 3) 4 single crystal
Место публикации : Eur. Phys. J. B: SPRINGER, 2008. - Vol. 62, Is. 2. - P123-128. - ISSN 1434-6028, DOI 10.1140/epjb/e2008-00146-5
Примечания : Cited References: 18
Предметные рубрики: IRON
NDFE3(BO3)(4)
GDFE3(BO3)(4)
Ключевые слова (''Своб.индексиров.''): antiferromagnetic orders--iron subsystems--antiferromagnetic materials--dysprosium compounds--magnetic field effects--magnetization--specific heat--thermodynamics--single crystals
Аннотация: We present thermodynamic and magnetic studies of single crystalline DyFe3(BO3)(4). The data indicate an easy axis antiferromagnetic order below T-N similar to 38 K which we attribute to the Fe subsystem. The Dy subsystem remains paramagnetic down to the lowest investigated temperatures of 2 K, but it is polarized by the Fe spins due to a f-d interaction. External magnetic field leads to a spin-flop transition in the iron subsystem as well as to superposed magnetization in the Dy subsystem. The repopulation of two low-lying Kramers doublets in Dy3+ ions results in well defined Schottky anomalies in specific heat and magnetization.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Stanislavchuk T. N., Malkin B. Z., Bezmaternykh L. N.
Заглавие : Optical spectroscopy of PrFe3(BO3)(4): Crystal-field and anisotropic Pr-Fe exchange interactions
Коллективы : Russian Foundation for Basic Research [07-02-01185, 09-02-00930]; Russian Academy of Sciences under the Programs for Basic Research
Разночтения заглавия :авие SCOPUS: Optical spectroscopy of PrFe3 (BO3) 4: Crystal-field and anisotropic Pr-Fe exchange interactions
Место публикации : Phys. Rev. B. - 2009. - Vol. 80, Is. 19. - Ст.195101. - ISSN 1098-0121, DOI 10.1103/PhysRevB.80.195101
Примечания : Cited References: 36. - We thank S. Klimin for useful information concerning the structure of PrFeINF3/INF(BOINF3/INF)INF4/INF and E. Chukalina for participating in some measurements. This work was supported in part by the Russian Foundation for Basic Research (Grants No. 07-02-01185 and No. 09-02-00930) and by the Russian Academy of Sciences under the Programs for Basic Research.
Предметные рубрики: TRIGONAL GDFE3(BO3)(4)
NDFE3(BO3)(4)
DYFE3(BO3)(4)
TRANSITIONS
BORATE
ION
ND
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--crystal field interactions--exchange interactions (electron)--infrared spectra--iron compounds--magnetic susceptibility--magneto-optical effects--paramagnetic materials--praseodymium compounds--spin hamiltonians--visible spectra
Аннотация: High-resolution polarized optical absorption spectra of PrFe3(BO3)(4) in the paramagnetic and antiferromagnetic phases are reported. The measured energies of the crystal-field (CF) levels within the 4f(2) configuration of Pr3+ in the paramagnetic PrFe3(BO3)(4) are described by the CF model that involves the 4f(2)/4f5d and 4f(2)/4f6p configuration interactions. Ordering of Fe spins along the crystalline c axis below T-N=32 K is confirmed by the analysis of the spectra of Er3+ introduced as a probe into PrFe3(BO3)(4). To account for the observed changes in the optical spectra of Pr3+ at temperatures below T-N, in particular, for the shift of the CF levels, splitting of the CF doublets, and the appearance of forbidden lines, the Pr-Fe exchange Hamiltonian defined by seven parameters is considered. The theoretical approach has been tested by calculating the temperature dependence of the magnetic susceptibility. A good agreement between theory and optical and magnetic experimental data is found demonstrating the validity of the model used. The obtained results confirm that the model of the iron dimers inside the spiral chains of Fe3+(O2-)(6) octahedrons introduced by us earlier for NdFe3(BO3)(4) and modified in the present work may serve as a basis for analyzing the low-temperature properties of other rare-earth iron borates.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chaudhury R. P., Yen F., Lorenz B., Sun Y. Y., Bezmaternykh L. N., Temerov V. L., Chu C. W.
Заглавие : Magnetoelectric effect and spontaneous polarization in HoFe3(BO3)(4) and Ho0.5Nd0.5Fe3(BO3)(4)
Коллективы : NSF [DMR9804325]; Temple Foundation; State of Texas through the TC-SUH; DoE
Разночтения заглавия :авие SCOPUS: Magnetoelectric effect and spontaneous polarization in HoFe3 (BO3) 4 and Ho0.5 Nd0.5 Fe3 (BO 3) 4
Место публикации : Phys. Rev. B. - 2009. - Vol. 80, Is. 10. - Ст.104424. - ISSN 1098-0121, DOI 10.1103/PhysRevB.80.104424
Примечания : Cited References: 35. - This work is supported in part by NSF Grant No. DMR9804325, the T. L. L. Temple Foundation, the J.J. and R. Moores Endowment, and the State of Texas through the TC-SUH and at LBNL by the DoE.
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
PHASE-TRANSITIONS
NDFE3(BO3)(4)
MULTIFERROICS
Аннотация: The thermodynamic, magnetic, dielectric, and magnetoelectric properties of HoFe3(BO3)(4) and Ho0.5Nd0.5Fe3(BO3)(4) are investigated. Both compounds show a second order Neel transition above 30 K and a first-order spin reorientation transition below 10 K. HoFe3(BO3)(4) develops a spontaneous electrical polarization below the Neel temperature (T-N) which is diminished in external magnetic fields. No magnetic-field induced increase of the polarization could be observed in HoFe3(BO3)(4). In contrast, the solid solution Ho0.5Nd0.5Fe3(BO3)(4) exhibits both, a spontaneous polarization below T-N and a positive magnetoelectric effect at higher fields that extends to high temperatures. The superposition of spontaneous polarization, induced by the internal magnetic field in the ordered state, and the magnetoelectric polarizations due to the external field results in a complex behavior of the total polarization measured as a function of temperature and field.
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