Neutron scattering study of Sr2Cu3O4Cl2

Y. J. Kim; R. J. Birgeneau; F. C. Chou; M. Greven; M. A. Kastner; Y. S. Lee; B. O. Wells; A. Aharony; O. Entin-Wohlman; I. Ya Korenblit; A. B. Harris; R. W. Erwin; G. Shirane

doi:10.1103/PhysRevB.64.024435

Neutron scattering study of Sr₂Cu₃O₄Cl₂

Y. J. Kim, R. J. Birgeneau, F. C. Chou, M. Greven, M. A. Kastner, Y. S. Lee, B. O. Wells, A. Aharony, O. Entin-Wohlman, I. Ya Korenblit, A. B. Harris, R. W. Erwin, G. Shirane

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Abstract

We report a neutron scattering study on the tetragonal compound Sr₂Cu₃O₄Cl₂, which has two-dimensional (2D) interpenetrating Cu_I and Cu_II subsystems, each forming a S = 1/2 square lattice quantum Heisenberg antiferromagnet (SLQHA). The mean-field ground state is degenerate, since the intersubsystem interactions are geometrically frustrated. Magnetic neutron scattering experiments show that quantum fluctuations lift the degeneracy and cause a 2D Ising ordering of the Cu_II subsystem. Due to quantum fluctuations a dramatic increase of the Cu_I out-of-plane spin-wave gap is also observed. The temperature dependence and the dispersion of the spin-wave energy are quantitatively explained by spin-wave calculations which include quantum fluctuations explicitly. The values for the nearest-neighbor superexchange interactions between the Cu_I and Cu_II ions and between the Cu_II ions are determined experimentally to be J_I-II= -10(2) meV and J_II = 10.5(5) meV, respectively. Due to its small exchange interaction J_II, the 2D dispersion of the Cu_II SLQHA can be measured over the whole Brillouin zone with thermal neutrons, and a dispersion at the zone boundary, predicted by theory, is confirmed. The instantaneous magnetic correlation length of the Cu_II SLQHA is obtained up to a very high temperature, T/J_II≈0.75. This result is compared with several theoretical predictions as well as recent experiments on the S = 1/2 SLQHA.

Original language	English
Article number	024435
Pages (from-to)	244351-2443519
Number of pages	2199169
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	64
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.64.024435
State	Published - 1 Jan 2001
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Kim, Y. J., Birgeneau, R. J., Chou, F. C., Greven, M., Kastner, M. A., Lee, Y. S., Wells, B. O., Aharony, A., Entin-Wohlman, O., Korenblit, I. Y., Harris, A. B., Erwin, R. W., & Shirane, G. (2001). Neutron scattering study of Sr₂Cu₃O₄Cl₂. Physical Review B - Condensed Matter and Materials Physics, 64(2), 244351-2443519. [024435]. https://doi.org/10.1103/PhysRevB.64.024435

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title = "Neutron scattering study of Sr2Cu3O4Cl2",

abstract = "We report a neutron scattering study on the tetragonal compound Sr2Cu3O4Cl2, which has two-dimensional (2D) interpenetrating CuI and CuII subsystems, each forming a S = 1/2 square lattice quantum Heisenberg antiferromagnet (SLQHA). The mean-field ground state is degenerate, since the intersubsystem interactions are geometrically frustrated. Magnetic neutron scattering experiments show that quantum fluctuations lift the degeneracy and cause a 2D Ising ordering of the CuII subsystem. Due to quantum fluctuations a dramatic increase of the CuI out-of-plane spin-wave gap is also observed. The temperature dependence and the dispersion of the spin-wave energy are quantitatively explained by spin-wave calculations which include quantum fluctuations explicitly. The values for the nearest-neighbor superexchange interactions between the CuI and CuII ions and between the CuII ions are determined experimentally to be JI-II= -10(2) meV and JII = 10.5(5) meV, respectively. Due to its small exchange interaction JII, the 2D dispersion of the CuII SLQHA can be measured over the whole Brillouin zone with thermal neutrons, and a dispersion at the zone boundary, predicted by theory, is confirmed. The instantaneous magnetic correlation length of the CuII SLQHA is obtained up to a very high temperature, T/JII≈0.75. This result is compared with several theoretical predictions as well as recent experiments on the S = 1/2 SLQHA.",

author = "Kim, {Y. J.} and Birgeneau, {R. J.} and Chou, {F. C.} and M. Greven and Kastner, {M. A.} and Lee, {Y. S.} and Wells, {B. O.} and A. Aharony and O. Entin-Wohlman and Korenblit, {I. Ya} and Harris, {A. B.} and Erwin, {R. W.} and G. Shirane",

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doi = "10.1103/PhysRevB.64.024435",

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AU - Kim, Y. J.

AU - Birgeneau, R. J.

AU - Chou, F. C.

AU - Greven, M.

AU - Kastner, M. A.

AU - Lee, Y. S.

AU - Wells, B. O.

AU - Aharony, A.

AU - Entin-Wohlman, O.

AU - Korenblit, I. Ya

AU - Harris, A. B.

AU - Erwin, R. W.

AU - Shirane, G.

PY - 2001/1/1

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N2 - We report a neutron scattering study on the tetragonal compound Sr2Cu3O4Cl2, which has two-dimensional (2D) interpenetrating CuI and CuII subsystems, each forming a S = 1/2 square lattice quantum Heisenberg antiferromagnet (SLQHA). The mean-field ground state is degenerate, since the intersubsystem interactions are geometrically frustrated. Magnetic neutron scattering experiments show that quantum fluctuations lift the degeneracy and cause a 2D Ising ordering of the CuII subsystem. Due to quantum fluctuations a dramatic increase of the CuI out-of-plane spin-wave gap is also observed. The temperature dependence and the dispersion of the spin-wave energy are quantitatively explained by spin-wave calculations which include quantum fluctuations explicitly. The values for the nearest-neighbor superexchange interactions between the CuI and CuII ions and between the CuII ions are determined experimentally to be JI-II= -10(2) meV and JII = 10.5(5) meV, respectively. Due to its small exchange interaction JII, the 2D dispersion of the CuII SLQHA can be measured over the whole Brillouin zone with thermal neutrons, and a dispersion at the zone boundary, predicted by theory, is confirmed. The instantaneous magnetic correlation length of the CuII SLQHA is obtained up to a very high temperature, T/JII≈0.75. This result is compared with several theoretical predictions as well as recent experiments on the S = 1/2 SLQHA.

AB - We report a neutron scattering study on the tetragonal compound Sr2Cu3O4Cl2, which has two-dimensional (2D) interpenetrating CuI and CuII subsystems, each forming a S = 1/2 square lattice quantum Heisenberg antiferromagnet (SLQHA). The mean-field ground state is degenerate, since the intersubsystem interactions are geometrically frustrated. Magnetic neutron scattering experiments show that quantum fluctuations lift the degeneracy and cause a 2D Ising ordering of the CuII subsystem. Due to quantum fluctuations a dramatic increase of the CuI out-of-plane spin-wave gap is also observed. The temperature dependence and the dispersion of the spin-wave energy are quantitatively explained by spin-wave calculations which include quantum fluctuations explicitly. The values for the nearest-neighbor superexchange interactions between the CuI and CuII ions and between the CuII ions are determined experimentally to be JI-II= -10(2) meV and JII = 10.5(5) meV, respectively. Due to its small exchange interaction JII, the 2D dispersion of the CuII SLQHA can be measured over the whole Brillouin zone with thermal neutrons, and a dispersion at the zone boundary, predicted by theory, is confirmed. The instantaneous magnetic correlation length of the CuII SLQHA is obtained up to a very high temperature, T/JII≈0.75. This result is compared with several theoretical predictions as well as recent experiments on the S = 1/2 SLQHA.

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JO - Physical Review B

JF - Physical Review B

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ER -

Neutron scattering study of Sr₂Cu₃O₄Cl₂

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