Anomalous dynamical spin susceptibility in the SU(N) Heisenberg spin-glass model and SrCr9xGa12-9xO19
We solve the SU(N) Heisenberg spin-glass model in the limit of large N focusing on the dynamical spin susceptibility. We show that the results for the model at S = 3/2, which is appropriate for the SrCr9xGa 12-9xO19 compound, have a qualitative behavior in close agreement with neutron-scattering dat...
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| Autores principales: | , |
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2004
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v69_n2_p204041_Camjayi http://hdl.handle.net/20.500.12110/paper_01631829_v69_n2_p204041_Camjayi |
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| Sumario: | We solve the SU(N) Heisenberg spin-glass model in the limit of large N focusing on the dynamical spin susceptibility. We show that the results for the model at S = 3/2, which is appropriate for the SrCr9xGa 12-9xO19 compound, have a qualitative behavior in close agreement with neutron-scattering data. Quantum fluctuations produce a significant transfer of spectral weight to higher frequencies, while thermal fluctuations are responsible for a dramatic change in the low-frequency part of the dynamical spin susceptibility where T becomes comparable to the spin-glass transition temperature. |
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