Peculiar magnetism of UAu2Si2

Chihiro Tabata, Naoyuki Miura, Klára Uhlířová, Michal Vališka, Hiraku Saito, Hiroyuki Hidaka, Tatsuya Yanagisawa, Vladimír Sechovský, and Hiroshi Amitsuka
Phys. Rev. B 94, 214414 – Published 14 December 2016

Abstract

Single-crystalline UAu2Si2 has been grown by a floating-zone melting method, and its magnetic, thermal, and transport properties have been investigated through measurements of magnetization, specific heat, and electrical resistivity to reveal its peculiar magnetism. It is shown that UAu2Si2 undergoes a second-order phase transition at Tm = 19 K, which had been believed to be ferromagnetic ordering in the literature, from a paramagnetic phase to an uncompensated antiferromagnetic phase with spontaneous magnetization along the tetragonal c axis (the easy magnetization direction). The magnetic entropy analysis points to the itinerant character of 5f electrons in the magnetic ordered state of UAu2Si2 with large enhancement of the electronic specific heat coefficient of γ150 mJ/K2mol at 2 K. It also reveals the relatively isotropic crystalline electric field effect of this compound, with contrast to the other relative isostructural compounds. The observed magnetization curves strongly suggest that there is a parasitic ferromagnetic component developing below 50 K in high coercivity with the easy axis along the tetragonal c axis. The results are discussed in the context of evolution of magnetism within the entire family of isostructural UT2Si2 compounds.

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  • Received 19 August 2016
  • Revised 18 November 2016

DOI:https://doi.org/10.1103/PhysRevB.94.214414

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Chihiro Tabata1,*, Naoyuki Miura1, Klára Uhlířová2, Michal Vališka2, Hiraku Saito1, Hiroyuki Hidaka1, Tatsuya Yanagisawa1, Vladimír Sechovský2, and Hiroshi Amitsuka1

  • 1Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • 2Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

  • *Present address: Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba Japan; ctabata@post.kek.jp

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Issue

Vol. 94, Iss. 21 — 1 December 2016

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