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Title: Evolution of magnetism in single-crystal Ca2Ru1-xIrxO4(0x0.65)

In this paper, we report structural, magnetic, transport, and thermal properties of single-crystal Ca2Ru1-xIrxO4(0≤x≤0.65). 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. Finally, the stark difference between 3d- and 5d-element doping underlines a strong magnetoelastic coupling inherent in the Ir-rich oxides.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4] ;  [1]
  1. Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials. Dept. of Physics and Astronomy
  2. Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials. Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Renmin Univ. of China, Beijing (China). Dept. of Physics
  3. Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials. Dept. of Physics and Astronomy; Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Solid State Physics
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Publication Date:
OSTI Identifier:
1324139
Grant/Contract Number:
DMR-1265162
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 2; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Kentucky, Lexington, KY (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF) (United States); China Scholarship Council
Contributing Orgs:
Renmin Univ. of China, Beijing (China); Chinese Academy of Sciences (CAS), Hefei (China)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY