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http://elar.urfu.ru/handle/10995/101759
Title: | Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements |
Authors: | Herrero, A. Oleaga, A. Gubkin, A. F. Frontzek, M. D. Salazar, A. Baranov, N. V. |
Issue Date: | 2019 |
Publisher: | Elsevier Ltd |
Citation: | Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements / A. Herrero, A. Oleaga, A. F. Gubkin, et al. — DOI 10.1016/j.intermet.2019.106519 // Intermetallics. — 2019. — Vol. 111. — 106519. |
Abstract: | A comprehensive study of the magnetic phase transitions in Tb3Co has been undertaken combining different techniques. Using single crystal neutron diffraction in the paramagnetic state a weak crystal structure distortion from the room temperature orthorhombic structure of the Fe3C type described with the Pnma space group toward structure with lower symmetry has been observed with cooling below 100 K. At 81 K there is a second order phase transition to an antiferromagnetic incommensurate phase with the propagation vector k = (0.155, 0, 0). As derived from thermal diffusivity measurements, the critical exponents for this transition are very close to the 3D-Heisenberg universality class, proving that the magnetic interactions are short-range but with a deviation from perfect isotropy due to crystal field effects. At T2 ≈ 70 K there is another magnetic phase transition to a ferromagnetic state whose character is shown to be weakly first order. The low temperature magnetic state has a non-coplanar ferromagnetic structure with strong ferromagnetic components of Tb magnetic moments along the crystallographic c-axis. The application of an external magnetic field B = 2 T along the c crystallographic axis suppresses the incommensurate antiferromagnetic phase and gives rise to the ferromagnetic phase. The magnetic entropy peak change as well as the refrigerant capacity indicate that Tb3Co is a competitive magnetocaloric material in this temperature range. © 2019 Elsevier Ltd |
Keywords: | CRITICAL BEHAVIOR MAGNETOCALORIC EFFECT NEUTRON DIFFRACTION SPIN-ORDERING TB3CO THERMAL DIFFUSIVITY ANTIFERROMAGNETISM BINARY ALLOYS COBALT ALLOYS CRYSTAL SYMMETRY FERROMAGNETIC MATERIALS FERROMAGNETISM IRON COMPOUNDS MAGNETIC MOMENTS MAGNETOCALORIC EFFECTS NEUTRON DIFFRACTION NEUTRONS SINGLE CRYSTALS TEMPERATURE THERMAL DIFFUSIVITY VECTOR SPACES CRITICAL BEHAVIOR FERROMAGNETIC STRUCTURES MAGNETIC PHASE TRANSITIONS NEUTRON DIFFRACTION MEASUREMENTS SECOND-ORDER PHASE TRANSITION SINGLE-CRYSTAL NEUTRON DIFFRACTION SPIN ORDER TB3CO TERBIUM ALLOYS |
URI: | http://elar.urfu.ru/handle/10995/101759 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 85065863888 |
PURE ID: | 9815469 396902c9-f851-430a-a1bf-75ed00b7aed8 |
ISSN: | 9669795 |
DOI: | 10.1016/j.intermet.2019.106519 |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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