Please use this identifier to cite or link to this item: http://hdl.handle.net/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://hdl.handle.net/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, проиндексированные в SCOPUS и WoS CC

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