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Magnetic ground state of the Ising-like antiferromagnet DyScO3 / L. S. Wu [et al.] // Phys. Rev. B. - 2017. - Vol. 96, Is. 14. - Ст. 144407, DOI 10.1103/PhysRevB.96.144407. - Cited References:37. - We thank J. M. Sheng and Q. Zhang for the help with the neutron data refinement. We would like to thank A. Christianson, I. Zaliznyak, M. Mourigal, Z. T. Wang, and C. Batista for useful discussions. The research at the Spallation Neutron Source (ORNL) is supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (DOE). Research supported in part by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. This work was partly supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Science and Engineering Division. . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Physics, Condensed Matter
Рубрики:
THIN-FILMS
   FERROELECTRICITY
   VISUALIZATION
   EXCITATIONS
Аннотация: We report on the low-temperature magnetic properties of the DyScO3 perovskite, which were characterized by means of single crystal and powder neutron scattering, and by magnetization measurements. Below TN = 3.15 K, Dy3+ moments form an antiferromagnetic structure with an easy axis of magnetization lying in the ab plane. The magnetic moments are inclined at an angle of ∼ +/- 28 degrees to the b axis. We show that the ground-state Kramers doublet of Dy3+ is made up of primarily |+/- 15/2 ⟩ eigenvectors and well separated by a crystal field from the first excited state at E1 = 24.9 meV. This leads to an extreme Ising single-ion anisotropy, M⊥/M∥∼ 0.05. The transverse magnetic fluctuations, which are proportional to M⊥2/M∥2, are suppressed, and only moment fluctuations along the local Ising direction are allowed. We also found that the Dy-Dy dipolar interactions along the crystallographic c axis are two to four times larger than in-plane interactions.

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Держатели документа:
Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA.
Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany.
Tech Univ Dresden, Inst Festkorper & Mat Phys, D-01069 Dresden, Germany.
Oak Ridge Natl Lab, Chem & Engn Mat Div, Oak Ridge, TN 37831 USA.
Fed Res Ctr SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Oak Ridge Natl Lab, Neutron Data Anal & Visualizat Div, Oak Ridge, TN 37831 USA.
Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
Oak Ridge Natl Lab, Chem Sci Div, Oak Ridge, TN 37831 USA.
Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA.

Доп.точки доступа:
Wu, L. S.; Nikitin, S. E.; Frontzek, M.; Kolesnikov, A. I.; Ehlers, G.; Lumsden, M. D.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Guo, E. -J.; Savici, A. T.; Gai, Z.; Sefat, A. S.; Podlesnyak, A.; Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (DOE); Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Science and Engineering Division
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Low-temperature spin dynamics in the TmFeO3 orthoferrite with a non-Kramers ion / S. A. Skorobogatov, S. E. Nikitin, K. A. Shaykhutdinov [et al.] // Phys. Rev. B. - 2020. - Vol. 101, Is. 1. - Ст. 014432, DOI 10.1103/PhysRevB.101.014432. - 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 . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
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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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Dept Solid State Phys & Nanotechnol, Krasnoyarsk 660041, Russia.
Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany.
Tech Univ Dresden, Inst Festkorper & Mat Phys, D-01069 Dresden, Germany.
Oak Ridge Natl Lab, Neutron Technol Div, POB 2009, Oak Ridge, TN 37831 USA.
Oak Ridge Natl Lab, Neutron Scattering Div, POB 2009, Oak Ridge, TN 37831 USA.
Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland.

Доп.точки доступа:
Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Nikitin, S. E.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Balaev, A. D.; Балаев, Александр Дмитриевич; Terentjev, K. Yu.; Терентьев, Константин Юрьевич; Ehlers, G.; Sala, G.; Pomjakushina, E., V; Conder, K.; Podlesnyak, A.; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM)
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