Evolution of magnetism in single-crystal Ca2Ru1xIrxO4(0x0.65)

S. J. Yuan, J. Terzic, J. C. Wang, L. Li, S. Aswartham, W. H. Song, F. Ye, and G. Cao
Phys. Rev. B 92, 024425 – Published 24 July 2015
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Abstract

We report structural, magnetic, transport, and thermal properties of single-crystal Ca2Ru1xIrxO4(0x0.65). Ca2RuO4 is a structurally driven Mott insulator with a metal-insulator transition at TMI=357K, which is well separated from antiferromagnetic order at TN=110K. Substitution of a 5d element, Ir, for Ru enhances spin-orbit coupling and locking between the structural distortions and magnetic moment canting. Ir doping intensifies the distortion or rotation of Ru/IrO6 octahedra and induces weak ferromagnetic behavior along the c axis. In particular, Ir doping suppresses TN but concurrently causes an additional magnetic ordering TN2 at a higher temperature up to 210 K for x=0.65. The effect of Ir doping sharply contrasts with that of 3d-element doping such as Cr, Mn, and Fe, which suppresses TN and induces unusual negative volume thermal expansion. The stark difference between 3d- and 5d-element doping underlines a strong magnetoelastic coupling inherent in the Ir-rich oxides.

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  • Received 7 April 2015

DOI:https://doi.org/10.1103/PhysRevB.92.024425

©2015 American Physical Society

Authors & Affiliations

S. J. Yuan1,*, J. Terzic1, J. C. Wang1,2,3, L. Li1, S. Aswartham1, W. H. Song1,4, F. Ye2, and G. Cao1,†

  • 1Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA
  • 2Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Department of Physics, Renmin University of China, Beijing 100872, China
  • 4Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

  • *shujuan.yuan@uky.edu
  • cao@uky.edu

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Issue

Vol. 92, Iss. 2 — 1 July 2015

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