Heat transport in quantum spin system Cu2Te2O5Cl2-xBrx (CROSBI ID 507889)
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Bilušić, Ante
engleski
Heat transport in quantum spin system Cu2Te2O5Cl2-xBrx
Insulating copper-tellurides (of the general formula Cu2Te205(Cl2_xBrx)) belong to the class of geometrically frustrated systems due to the tetrahedral arrangement of Cu2+ ions. Between 11.4 K and 18.2 K (depending on the Br content) coppertellurides exhibit a magnetic phase transition with the formation of the long-range spin-ordered state. We present the thermal conductivity data of copper-tellurides. For temperatures higher than the transition temperature, a resonant magneto-elastic coupling takes part in the phonon scattering. At the transition temperatures thermal conductivity increases for an order of magnitude, indicating that spin long-range ordered state switches off the phonon resonance scattering in the spin subsystem.
spin frustration; magnetic ordering; thermal conductivity
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Workshop of the CRO-HU bilateral cooperation "Complex Systems of Strongly correlated Electrons"
pozvano predavanje
05.09.2005-06.09.2005
Zagreb, Hrvatska