Ba8CoNb6 O24: A spin- 12 triangular-lattice Heisenberg antiferromagnet in the two-dimensional limit

R. Rawl; L. Ge; H. Agrawal; Y. Kamiya; C. R. Dela Cruz; N. P. Butch; X. F. Sun; M. Lee; E. S. Choi; J. Oitmaa; C. D. Batista; M. Mourigal; H. D. Zhou; J. Ma

doi:10.1103/PhysRevB.95.060412

Ba8CoNb6 O24: A spin- 12 triangular-lattice Heisenberg antiferromagnet in the two-dimensional limit

R. Rawl, L. Ge, H. Agrawal, Y. Kamiya, C. R. Dela Cruz, N. P. Butch, X. F. Sun, M. Lee, E. S. Choi, J. Oitmaa, C. D. Batista, M. Mourigal, H. D. Zhou, J. Ma

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Abstract

The perovskite Ba8CoNb6O24 comprises equilateral effective spin-12 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-12 triangular Heisenberg model, which is not expected to exhibit symmetry breaking at finite temperatures according to the Mermin and Wagner theorem.

Original language	English
Article number	060412
Journal	Physical Review B
Volume	95
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.95.060412
State	Published - Feb 17 2017

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title = "Ba8CoNb6 O24: A spin- 12 triangular-lattice Heisenberg antiferromagnet in the two-dimensional limit",

abstract = "The perovskite Ba8CoNb6O24 comprises equilateral effective spin-12 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-12 triangular Heisenberg model, which is not expected to exhibit symmetry breaking at finite temperatures according to the Mermin and Wagner theorem.",

author = "R. Rawl and L. Ge and H. Agrawal and Y. Kamiya and {Dela Cruz}, {C. R.} and Butch, {N. P.} and Sun, {X. F.} and M. Lee and Choi, {E. S.} and J. Oitmaa and Batista, {C. D.} and M. Mourigal and Zhou, {H. D.} and J. Ma",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = feb,

day = "17",

doi = "10.1103/PhysRevB.95.060412",

language = "English",

volume = "95",

journal = "Physical Review B",

issn = "2469-9950",

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TY - JOUR

T1 - Ba8CoNb6 O24

T2 - A spin- 12 triangular-lattice Heisenberg antiferromagnet in the two-dimensional limit

AU - Rawl, R.

AU - Ge, L.

AU - Agrawal, H.

AU - Kamiya, Y.

AU - Dela Cruz, C. R.

AU - Butch, N. P.

AU - Sun, X. F.

AU - Lee, M.

AU - Choi, E. S.

AU - Oitmaa, J.

AU - Batista, C. D.

AU - Mourigal, M.

AU - Zhou, H. D.

AU - Ma, J.

PY - 2017/2/17

Y1 - 2017/2/17

N2 - The perovskite Ba8CoNb6O24 comprises equilateral effective spin-12 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-12 triangular Heisenberg model, which is not expected to exhibit symmetry breaking at finite temperatures according to the Mermin and Wagner theorem.

AB - The perovskite Ba8CoNb6O24 comprises equilateral effective spin-12 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-12 triangular Heisenberg model, which is not expected to exhibit symmetry breaking at finite temperatures according to the Mermin and Wagner theorem.

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U2 - 10.1103/PhysRevB.95.060412

DO - 10.1103/PhysRevB.95.060412

M3 - Article

AN - SCOPUS:85013046181

SN - 2469-9950

VL - 95

JO - Physical Review B

JF - Physical Review B

IS - 6

M1 - 060412

ER -

Ba8CoNb6 O24: A spin- 12 triangular-lattice Heisenberg antiferromagnet in the two-dimensional limit

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