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Title: Fragile singlet ground-state magnetism in the pyrochlore osmates R 2 Os 2 O 7 ( R = Y and Ho)

Abstract

The singlet ground state magnetism in pyrochlore osmates Y 2Os 2O 7 and Ho 2Os 2O 7 is studied by DC and AC susceptibility, specific heat, and neutron powder diffraction measurements. Despite the expected non-magnetic singlet in the strong spin-orbit coupling (SOC) limit for Os 4+ (5d 4), Y 2Os 2O 7 exhibits a spin-glass (SG) ground state below 4 K with weak magnetism, suggesting possible proximity to a quantum phase transition between the non-magnetic state in the strong SOC limit and the magnetic state in the strong superexchange limit. Ho 2Os 2O 7 has the same structural distortion as occurs in Y 2Os 2O 7. However, the Os sublattice in Ho 2Os 2O 7 shows long- range magnetic ordering below 36 K. We find that the sharp difference of the magnetic ground state between Y 2Os 2O 7 and Ho 2Os 2O 7 signals the singlet ground state magnetism in R 2 Os 2 O 7 is fragile and can be disturbed by the weak 4f—5d interactions.

Authors:
 [1];  [2];  [2];  [3];  [3];  [4];  [5];  [6];  [7];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  5. Fudan Univ., Shanghai (China). Collaborative Innovation Center of Advanced Microstructures and Dept. of Physics and Center for Field Theory and Particle Physics
  6. The Ohio State Univ., Columbus, OH (United States). Dept. of Physics
  7. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1248765
Alternate Identifier(s):
OSTI ID: 1249711
Grant/Contract Number:  
AC05-00OR22725; DMR-1420451; NSF-DMR-1350002; GBMF4416
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 13; Journal ID: ISSN 2469-9950
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

Zhao, Z. Y., Calder, S., Aczel, A. A., McGuire, M. A., Sales, B. C., Mandrus, D. G., Chen, G., Trivedi, N., Zhou, H. D., and Yan, J. -Q. Fragile singlet ground-state magnetism in the pyrochlore osmates R2Os2O7 ( R=Y and Ho). United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.134426.
Zhao, Z. Y., Calder, S., Aczel, A. A., McGuire, M. A., Sales, B. C., Mandrus, D. G., Chen, G., Trivedi, N., Zhou, H. D., & Yan, J. -Q. Fragile singlet ground-state magnetism in the pyrochlore osmates R2Os2O7 ( R=Y and Ho). United States. doi:10.1103/PhysRevB.93.134426.
Zhao, Z. Y., Calder, S., Aczel, A. A., McGuire, M. A., Sales, B. C., Mandrus, D. G., Chen, G., Trivedi, N., Zhou, H. D., and Yan, J. -Q. Mon . "Fragile singlet ground-state magnetism in the pyrochlore osmates R2Os2O7 ( R=Y and Ho)". United States. doi:10.1103/PhysRevB.93.134426. https://www.osti.gov/servlets/purl/1248765.
@article{osti_1248765,
title = {Fragile singlet ground-state magnetism in the pyrochlore osmates R2Os2O7 ( R=Y and Ho)},
author = {Zhao, Z. Y. and Calder, S. and Aczel, A. A. and McGuire, M. A. and Sales, B. C. and Mandrus, D. G. and Chen, G. and Trivedi, N. and Zhou, H. D. and Yan, J. -Q.},
abstractNote = {The singlet ground state magnetism in pyrochlore osmates Y2Os2O7 and Ho2Os2O7 is studied by DC and AC susceptibility, specific heat, and neutron powder diffraction measurements. Despite the expected non-magnetic singlet in the strong spin-orbit coupling (SOC) limit for Os4+ (5d4), Y2Os2O7 exhibits a spin-glass (SG) ground state below 4 K with weak magnetism, suggesting possible proximity to a quantum phase transition between the non-magnetic state in the strong SOC limit and the magnetic state in the strong superexchange limit. Ho2Os2O7 has the same structural distortion as occurs in Y2Os2O7. However, the Os sublattice in Ho2Os2O7 shows long- range magnetic ordering below 36 K. We find that the sharp difference of the magnetic ground state between Y2Os2O7 and Ho2Os2O7 signals the singlet ground state magnetism in R2 Os2 O7 is fragile and can be disturbed by the weak 4f—5d interactions.},
doi = {10.1103/PhysRevB.93.134426},
journal = {Physical Review B},
number = 13,
volume = 93,
place = {United States},
year = {2016},
month = {4}
}

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    Works referencing / citing this record:

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    journal, July 2017

    • Pedersen, Kasper S.; Woodruff, Daniel N.; Singh, Saurabh Kumar
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    [OsF 6 ] x : Molecular Models for Spin-Orbit Entangled Phenomena
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    • Pedersen, Kasper S.; Woodruff, Daniel N.; Singh, Saurabh Kumar
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