Magnetoelastic phenomena in antiferromagnetic uranium intermetallics: The UAu2Si2 case

M. Vališka, H. Saito, T. Yanagisawa, C. Tabata, H. Amitsuka, K. Uhlířová, J. Prokleška, P. Proschek, J. Valenta, M. Míšek, D. I. Gorbunov, J. Wosnitza, and V. Sechovský
Phys. Rev. B 98, 174439 – Published 28 November 2018

Abstract

Thermal expansion, magnetostriction, and magnetization measurements under magnetic field and hydrostatic pressure were performed on a UAu2Si2 single crystal. They revealed a large anisotropy of magnetoelastic properties manifested by prominent length changes, leading to a collapse of the unit-cell volume accompanied by breaking the fourfold symmetry (similar to that in URu2Si2 in the hidden-order state) in the antiferromagnetic state as consequences of strong magnetoelastic coupling. The magnetostriction curves measured at higher temperatures confirm a bulk character of the 50K weak ferromagnetic phase. The large positive pressure change of the ordering temperature predicted from Ehrenfest relation contradicts the more than an order of magnitude smaller pressure dependence observed by the magnetization and specific heat measured under hydrostatic pressure. A comprehensive magnetic phase diagram of UAu2Si2 in magnetic field applied along the c axis is presented. The ground-state antiferromagnetic phase is suppressed by a field-induced metamagnetic transition that changes its character from second to first order at the tricritical point.

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  • Received 1 May 2018
  • Revised 1 November 2018

DOI:https://doi.org/10.1103/PhysRevB.98.174439

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Vališka1,2,*, H. Saito3, T. Yanagisawa3, C. Tabata4, H. Amitsuka3, K. Uhlířová1, J. Prokleška1, P. Proschek1, J. Valenta1, M. Míšek5, D. I. Gorbunov6, J. Wosnitza6,7, and V. Sechovský1

  • 1Faculty of Mathematics and Physics, Charles University, DCMP, Ke Karlovu 5, CZ-12116 Praha 2, Czech Republic
  • 2Institut Laue Langevin, 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
  • 3Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • 4Institute of Materials Structure Science, High Energy Accelerator Organization, Tsukuba 305-0801, Japan
  • 5Institute of Physics, ASCR v.v.i, Na Slovance 2, 182 21, Prague, Czech Republic
  • 6Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 7Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany

  • *michal.valiska@gmail.com

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Issue

Vol. 98, Iss. 17 — 1 November 2018

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