Magnetic ordering effects on thermal conductivity of geometrically frustrated system cu2Te2O5(Cl2-xBrx) (CROSBI ID 507886)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Bilušić, Ante ; Smontara, Ana ; Jagličić, Zvonko ; Dolinšek, Janez ; Berger, Helmuth
engleski
Magnetic ordering effects on thermal conductivity of geometrically frustrated system cu2Te2O5(Cl2-xBrx)
Spin frustrated systems are characterized by a specific interaction among spins by which none of the spin arrangements can satisfy all the bonds and simultaneously minimize the energy. There are two types of spin frustration: site (with quenched disorder, like in spin-glasses) and geometrical-based frustration, where triangular or tetrahedral distribution of antiferromagnetically ordered spins frustrates the system. 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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x-x-x.
2005.
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Podaci o matičnoj publikaciji
Abstract
Zlatić, Veljko
Zagreb: Institut za fiziku
Podaci o skupu
Workshop on Correlated Thermolectric Materials
poster
01.01.2005-01.01.2005
Hvar, Hrvatska