Naslov
Magnetic ordering effects on thermal conductivity of geometrically frustrated system cu2Te2O5(Cl2-xBrx)

Autori
Bilušić, Ante ; Smontara, Ana ; Jagličić, Zvonko ; Dolinšek, Janez ; Berger, Helmuth

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstract / Zlatić, Veljko - Zagreb : Institut za fiziku, 2005, X-x

Skup
Workshop on Correlated Thermolectric Materials

Mjesto i datum
Hvar, Hrvatska, 25.09.2005. - 30.09.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
spin frustration; magnetic ordering; thermal conductivity

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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