Evidence for an Unconventional Magnetic Instability in the Spin-Tetrahedra System Cu2Te2O5Br2

P. Lemmens; K. Y. Choi; E. E. Kaul; C. Geibel; K. Becker; W. Brenig; M. Johnsson; P. Millet; F. Mila

doi:10.1103/PhysRevLett.87.227201

Evidence for an Unconventional Magnetic Instability in the Spin-Tetrahedra System Cu₂Te₂O₅Br₂

P. Lemmens
, K. Y. Choi
, E. E. Kaul
, C. Geibel
, K. Becker
, W. Brenig
, M. Johnsson
, P. Millet
, F. Mila

RWTH Aachen University
Max Planck Institute for Chemical Physics of Solids
Technische Universität Dresden
Saarland University
Technical University of Braunschweig
Stockholm University
CEMES-CNRS
University of Lausanne

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Thermodynamic experiments as well as Raman scattering have been used to study the magnetic instabilities in the spin-tetrahedra systems Cu₂Te₂O₅X₂, X =Cl and Br. While the phase transition observed in the Cl system at T_N = 18.2K is consistent with 3D antiferromagnetic ordering, the phase transition at T_o = 11.4K in the Br system has several unusual features. We propose an explanation in terms of weakly coupled tetrahedra with a singlet-triplet gap and low-lying singlets.

Original language	English
Pages (from-to)	227201-227201-4
Journal	Physical Review Letters
Volume	87
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevLett.87.227201
State	Published - 26 Nov 2001
Externally published	Yes

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10.1103/PhysRevLett.87.227201

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title = "Evidence for an Unconventional Magnetic Instability in the Spin-Tetrahedra System Cu2Te2O5Br2",

abstract = "Thermodynamic experiments as well as Raman scattering have been used to study the magnetic instabilities in the spin-tetrahedra systems Cu2Te2O5X2, X =Cl and Br. While the phase transition observed in the Cl system at TN = 18.2K is consistent with 3D antiferromagnetic ordering, the phase transition at To = 11.4K in the Br system has several unusual features. We propose an explanation in terms of weakly coupled tetrahedra with a singlet-triplet gap and low-lying singlets.",

author = "P. Lemmens and Choi, \{K. Y.\} and Kaul, \{E. E.\} and C. Geibel and K. Becker and W. Brenig and M. Johnsson and P. Millet and F. Mila",

year = "2001",

month = nov,

day = "26",

doi = "10.1103/PhysRevLett.87.227201",

language = "English",

volume = "87",

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journal = "Physical Review Letters",

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T1 - Evidence for an Unconventional Magnetic Instability in the Spin-Tetrahedra System Cu2Te2O5Br2

AU - Lemmens, P.

AU - Choi, K. Y.

AU - Kaul, E. E.

AU - Geibel, C.

AU - Becker, K.

AU - Brenig, W.

AU - Johnsson, M.

AU - Millet, P.

AU - Mila, F.

PY - 2001/11/26

Y1 - 2001/11/26

N2 - Thermodynamic experiments as well as Raman scattering have been used to study the magnetic instabilities in the spin-tetrahedra systems Cu2Te2O5X2, X =Cl and Br. While the phase transition observed in the Cl system at TN = 18.2K is consistent with 3D antiferromagnetic ordering, the phase transition at To = 11.4K in the Br system has several unusual features. We propose an explanation in terms of weakly coupled tetrahedra with a singlet-triplet gap and low-lying singlets.

AB - Thermodynamic experiments as well as Raman scattering have been used to study the magnetic instabilities in the spin-tetrahedra systems Cu2Te2O5X2, X =Cl and Br. While the phase transition observed in the Cl system at TN = 18.2K is consistent with 3D antiferromagnetic ordering, the phase transition at To = 11.4K in the Br system has several unusual features. We propose an explanation in terms of weakly coupled tetrahedra with a singlet-triplet gap and low-lying singlets.

UR - https://www.scopus.com/pages/publications/84904595986

U2 - 10.1103/PhysRevLett.87.227201

DO - 10.1103/PhysRevLett.87.227201

M3 - Article

AN - SCOPUS:84904595986

SN - 0031-9007

VL - 87

SP - 227201-227201-4

JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

ER -

Evidence for an Unconventional Magnetic Instability in the Spin-Tetrahedra System Cu₂Te₂O₅Br₂

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