Ba8CoNb6O24: A spin-1/2 triangular-lattice Heisenberg antiferromagnet in the two-dimensional limit

被引：50

作者：

Rawl, R. ^{[1
]}

Ge, L. ^{[2
]}

Agrawal, H. ^{[3
]}

Kamiya, Y. ^{[4
]}

Dela Cruz, C. R. ^{[3
]}

Butch, N. P. ^{[5
]}

Sun, X. F. ^{[6
,7
,8
]}

Lee, M. ^{[9
,10
]}

Choi, E. S. ^{[10
]}

Oitmaa, J. ^{[11
]}

Batista, C. D. ^{[1
,3
,12
]}

Mourigal, M. ^{[2
]}

Zhou, H. D. ^{[1
,10
]}

Ma, J. ^{[1
,8
,13
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

[3] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37381 USA

[4] RIKEN, Condensed Matter Theory Lab, Wako, Saitama 3510198, Japan

[5] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[6] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[7] Chinese Acad Sci, Key Lab Strongly Coupled Quantum Matter Phys, Anhua 230026, Peoples R China

[8] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[9] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[10] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[11] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

[12] Oak Ridge Natl Lab, Shull Wollan Ctr, Oak Ridge, TN 37831 USA

[13] Shanghai Jiao Tong Univ, Dept Phys & Astron, Key Lab Artificial Struct & Quantum Control, Shanghai 200240, Peoples R China

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 06期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

CHAIN; WAVE;

D O I：

10.1103/PhysRevB.95.060412

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The perovskite Ba8CoNb6O24 comprises equilateral effective spin-1/2 Co2+ triangular layers separated by six nonmagnetic layers. Susceptibility, specific heat, and neutron scattering measurements combined with high-temperature series expansions and spin-wave calculations confirm that Ba8CoNb6O24 is basically a two-dimensional magnet with no detectable spin anisotropy and no long-range magnetic ordering down to 0.06 K. In other words, Ba8CoNb6O24 is very close to be a realization of the paradigmatic spin-1/2 triangular Heisenberg model, which is not expected to exhibit symmetry breaking at finite temperatures according to the Mermin and Wagner theorem.

引用

页数：5

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