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Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters


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.
Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters // Physical Review Letters, 102 (2009), 17; 177202-1 doi:10.1103/PhysRevLett.102.177202 (međunarodna recenzija, pismo, znanstveni)


Naslov
Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters

Autori
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.

Izvornik
Physical Review Letters (0031-9007) 102 (2009), 17; 177202-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, pismo, znanstveni

Ključne riječi
Inelastic neutron scattering; magnetic order; spin excitations

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
035-0352843-2845 - Kvantni magneti: Osnovna stanja u kompeticiji (Mladen Prester, )

Ustanove
Institut za fiziku, Zagreb

Autor s matičnim brojem:
Mladen Prester, (68441)

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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