Evolution of magnetism in single-crystal Ca2Ru1-xIrxO4(0≤x≤0.65)

Yuan, S. J.; Terzic, J.; Wang, J. C.; Li, L.; Aswartham, S.; Song, W. H.; Ye, Feng; Cao, Gang

doi:10.1103/PhysRevB.92.024425

Evolution of magnetism in single-crystal $C a_{2} R u_{1 - x} I r_{x} O_{4} (0 \leq x \leq 0.65)$

Journal Article · Fri Jul 24 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.024425· OSTI ID:1324139

Yuan, S. J. ^[1]; Terzic, J. ^[1]; Wang, J. C. ^[2]; Li, L. ^[1]; Aswartham, S. ^[1]; Song, W. H. ^[3]; Ye, Feng ^[4]; Cao, Gang ^[1]

Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials. Dept. of Physics and Astronomy
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
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
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division

In this paper, we report structural, magnetic, transport, and thermal properties of single-crystal Ca₂Ru_1-xIr_xO₄(0≤x≤0.65). Ca₂RuO₄ is a structurally driven Mott insulator with a metal-insulator transition at T_MI=357K, which is well separated from antiferromagnetic order at T_N=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 T_N but concurrently causes an additional magnetic ordering T_N2 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 T_N 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Kentucky, Lexington, KY (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF) (United States); China Scholarship Council

Contributing Organization:: Renmin Univ. of China, Beijing (China); Chinese Academy of Sciences (CAS), Hefei (China)

OSTI ID:: 1324139

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 2 Vol. 92; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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