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Title: Anomalous magnetic behavior of Ba 2 CoO 4 with isolated CoO 4 tetrahedra

Abstract

The dimensionality of the electronic and magnetic structure of a given material is generally predetermined by its crystal structure. Here, using elastic and inelastic neutron scattering combined with magnetization measurements, we discover unusual magnetic behavior in three-dimensional (3D) Ba 2CoO 4. In spite of isolated CoO 4 tetrahedra, the system exhibits a 3D noncollinear antiferromagnetic order in the ground state with an anomalously large Curie-Weiss temperature of 110 K compared to T N=26 K. More unexpectedly, spin dynamics displays quasi-two-dimensional spin-wave dispersion with an unusually large spin gap, and one-dimensional magnetoelastic coupling. Our results postulate that Ba 2CoO 4 is a unique system for exploring the interplay between isolated polyhedra, low-dimensional magnetism, and spin states in oxides.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3];  [2];  [2];  [2];  [2]
  1. Louisiana State Univ., Baton Rouge, LA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Louisiana State Univ., Baton Rouge, LA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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:
1505312
Alternate Identifier(s):
OSTI ID: 1499835
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Inelastic neutron scattering; Magnetization measurements; Neutron scattering

Citation Formats

Zhang, Qiang, Cao, Guixin, Ye, Feng, Cao, Huibo, Matsuda, Masaaki, Tennant, D. A., Chi, Songxue, Nagler, S. E., Shelton, W. A., Jin, Rongying, Plummer, E. W., and Zhang, Jiandi. Anomalous magnetic behavior of Ba2CoO4 with isolated CoO4 tetrahedra. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.094416.
Zhang, Qiang, Cao, Guixin, Ye, Feng, Cao, Huibo, Matsuda, Masaaki, Tennant, D. A., Chi, Songxue, Nagler, S. E., Shelton, W. A., Jin, Rongying, Plummer, E. W., & Zhang, Jiandi. Anomalous magnetic behavior of Ba2CoO4 with isolated CoO4 tetrahedra. United States. doi:10.1103/PhysRevB.99.094416.
Zhang, Qiang, Cao, Guixin, Ye, Feng, Cao, Huibo, Matsuda, Masaaki, Tennant, D. A., Chi, Songxue, Nagler, S. E., Shelton, W. A., Jin, Rongying, Plummer, E. W., and Zhang, Jiandi. Thu . "Anomalous magnetic behavior of Ba2CoO4 with isolated CoO4 tetrahedra". United States. doi:10.1103/PhysRevB.99.094416.
@article{osti_1505312,
title = {Anomalous magnetic behavior of Ba2CoO4 with isolated CoO4 tetrahedra},
author = {Zhang, Qiang and Cao, Guixin and Ye, Feng and Cao, Huibo and Matsuda, Masaaki and Tennant, D. A. and Chi, Songxue and Nagler, S. E. and Shelton, W. A. and Jin, Rongying and Plummer, E. W. and Zhang, Jiandi},
abstractNote = {The dimensionality of the electronic and magnetic structure of a given material is generally predetermined by its crystal structure. Here, using elastic and inelastic neutron scattering combined with magnetization measurements, we discover unusual magnetic behavior in three-dimensional (3D) Ba2CoO4. In spite of isolated CoO4 tetrahedra, the system exhibits a 3D noncollinear antiferromagnetic order in the ground state with an anomalously large Curie-Weiss temperature of 110 K compared to TN=26 K. More unexpectedly, spin dynamics displays quasi-two-dimensional spin-wave dispersion with an unusually large spin gap, and one-dimensional magnetoelastic coupling. Our results postulate that Ba2CoO4 is a unique system for exploring the interplay between isolated polyhedra, low-dimensional magnetism, and spin states in oxides.},
doi = {10.1103/PhysRevB.99.094416},
journal = {Physical Review B},
number = 9,
volume = 99,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
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This content will become publicly available on March 14, 2020
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