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Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters (CROSBI ID 150482)

Prilog u časopisu | Pismo (znanstveno) | međunarodna recenzija

Prša, Krunoslav ; Ronnow, H. M. ; Zaharko, O. ; Christensen, N. B. ; Jensen, J. ; Chang, J. ; Streule, S. ; Jime´nez-Ruiz, M. ; Berger, H. ; Prester, Mladen et al. Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters // Physical review letters, 102 (2009), 17; 177202-1-177202-4. doi: 10.1103/PhysRevLett.102.177202

Podaci o odgovornosti

Prša, Krunoslav ; Ronnow, H. M. ; Zaharko, O. ; Christensen, N. B. ; Jensen, J. ; Chang, J. ; Streule, S. ; Jime´nez-Ruiz, M. ; Berger, H. ; Prester, Mladen ; Mesot, J.

engleski

Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters

An inelastic neutron scattering study of Cu2Te2O5X2 (X=Cl, Br) shows strong dispersive modes with large energy gaps persisting far above TN, 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.

inelastic neutron scattering; magnetic order; spin excitations

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Podaci o izdanju

102 (17)

2009.

177202-1-177202-4

objavljeno

0031-9007

10.1103/PhysRevLett.102.177202

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Fizika

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