Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters

K. Prsa; H.M. Rønnow; O. Zaharko; Niels Bech Christensen; J. Jensen; J. Chang; S. Streule; M. Jimenez-Ruiz; H. Berger; M. Prester; J. Mesot

doi:10.1103/PhysRevLett.102.177202

Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters

K. Prsa, H.M. Rønnow, O. Zaharko, Niels Bech Christensen, J. Jensen, J. Chang, S. Streule, M. Jimenez-Ruiz, H. Berger, M. Prester, J. Mesot

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Abstract

An inelastic neutron scattering study of Cu2Te2O5X2 (X=Cl, Br) shows strong dispersive modes with large energy gaps persisting far above T-N, notably in Cu2Te2O5Br2. The anomalous features: a coexisting unusually weak Goldstone-like mode observed in Cu2Te2O5Cl2 and the size of the energy gaps cannot be explained by existing theories, such as our mean-field or random-phase approximation. We argue that our findings represent a new general type of behavior due to intercluster quantum fluctuations and call for development of a new theoretical approach.

Original language	English
Journal	Physical Review Letters
Volume	102
Issue number	17
Pages (from-to)	177202
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.102.177202
Publication status	Published - 2009

Bibliographical note

Copyright (2009) by the American Physical Society.

Keywords

Materials characterization and modelling
Materials research

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title = "Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters",

abstract = "An inelastic neutron scattering study of Cu2Te2O5X2 (X=Cl, Br) shows strong dispersive modes with large energy gaps persisting far above T-N, notably in Cu2Te2O5Br2. The anomalous features: a coexisting unusually weak Goldstone-like mode observed in Cu2Te2O5Cl2 and the size of the energy gaps cannot be explained by existing theories, such as our mean-field or random-phase approximation. We argue that our findings represent a new general type of behavior due to intercluster quantum fluctuations and call for development of a new theoretical approach.",

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doi = "10.1103/PhysRevLett.102.177202",

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pages = "177202",

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T1 - Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters

AU - Prsa, K.

AU - Rønnow, H.M.

AU - Zaharko, O.

AU - Christensen, Niels Bech

AU - Jensen, J.

AU - Chang, J.

AU - Streule, S.

AU - Jimenez-Ruiz, M.

AU - Berger, H.

AU - Prester, M.

AU - Mesot, J.

PY - 2009

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N2 - An inelastic neutron scattering study of Cu2Te2O5X2 (X=Cl, Br) shows strong dispersive modes with large energy gaps persisting far above T-N, notably in Cu2Te2O5Br2. The anomalous features: a coexisting unusually weak Goldstone-like mode observed in Cu2Te2O5Cl2 and the size of the energy gaps cannot be explained by existing theories, such as our mean-field or random-phase approximation. We argue that our findings represent a new general type of behavior due to intercluster quantum fluctuations and call for development of a new theoretical approach.

AB - An inelastic neutron scattering study of Cu2Te2O5X2 (X=Cl, Br) shows strong dispersive modes with large energy gaps persisting far above T-N, notably in Cu2Te2O5Br2. The anomalous features: a coexisting unusually weak Goldstone-like mode observed in Cu2Te2O5Cl2 and the size of the energy gaps cannot be explained by existing theories, such as our mean-field or random-phase approximation. We argue that our findings represent a new general type of behavior due to intercluster quantum fluctuations and call for development of a new theoretical approach.

KW - Materials characterization and modelling

KW - Materials research

KW - Materialeforskning

KW - Materialekarakterisering og materialemodellering

U2 - 10.1103/PhysRevLett.102.177202

DO - 10.1103/PhysRevLett.102.177202

M3 - Journal article

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SP - 177202

JO - Physical Review Letters

JF - Physical Review Letters

IS - 17

ER -

Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters

Abstract

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