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Title: Evolution of magnetism in single-crystal C a 2 R u 1 - x I r x O 4 ( 0 x 0.65 )

Abstract

In this paper, we report structural, magnetic, transport, and thermal properties of single-crystal Ca 2Ru 1-xIr xO 4(0≤x≤0.65). Ca 2RuO 4 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/IrO 6 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.

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:
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); China Scholarship Council
Contributing Org.:
Renmin Univ. of China, Beijing (China); Chinese Academy of Sciences (CAS), Hefei (China)
OSTI Identifier:
1324139
Grant/Contract Number:  
DMR-1265162
Resource Type:
Journal Article: 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)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Yuan, S. J., Terzic, J., Wang, J. C., Li, L., Aswartham, S., Song, W. H., Ye, Feng, and Cao, Gang. Evolution of magnetism in single-crystal Ca2Ru1-xIrxO4(0≤x≤0.65). United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.024425.
Yuan, S. J., Terzic, J., Wang, J. C., Li, L., Aswartham, S., Song, W. H., Ye, Feng, & Cao, Gang. Evolution of magnetism in single-crystal Ca2Ru1-xIrxO4(0≤x≤0.65). United States. doi:10.1103/PhysRevB.92.024425.
Yuan, S. J., Terzic, J., Wang, J. C., Li, L., Aswartham, S., Song, W. H., Ye, Feng, and Cao, Gang. Fri . "Evolution of magnetism in single-crystal Ca2Ru1-xIrxO4(0≤x≤0.65)". United States. doi:10.1103/PhysRevB.92.024425. https://www.osti.gov/servlets/purl/1324139.
@article{osti_1324139,
title = {Evolution of magnetism in single-crystal Ca2Ru1-xIrxO4(0≤x≤0.65)},
author = {Yuan, S. J. and Terzic, J. and Wang, J. C. and Li, L. and Aswartham, S. and Song, W. H. and Ye, Feng and Cao, Gang},
abstractNote = {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.},
doi = {10.1103/PhysRevB.92.024425},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 2,
volume = 92,
place = {United States},
year = {2015},
month = {7}
}

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