Naslov
The role of magnetic excitations in the thermal conductivity of Cu2Te2O5Cl2 and Cu2Te2O5Br2

Autori
Bilušić, Ante ; Smontara, Ana ; Berger, H.

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

Izvornik
From Solid State To BioPhysics II, Role of Inhomogenities in Solid, Soft and Bio-Matter / Forro, Laszlo ; Pavuna, Davor - Lausanne : IPMC-FSB-EPFL, 2004, 77-77

Skup
From Solid State To BioPhysics II

Mjesto i datum
Cavtat, Hrvatska, 26.06.2004. - 02.07.2004

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
nonelectronic thermal conductivity and heat-pulse propagation in solids including thermal waves; spin diffusion

Sažetak
We present the thermal conductivity data of spin-tetrahedra copper-tellurides Cu2Te2O5Cl2 and Cu2Te2O5Br2. The thermal conductivity is enhanced in both compounds below magnetic ordering temperatures as observed in the ac-susceptibility measurements [1], with the larger enhancement in the case of Cl sample. For temperatures above the transition temperature, the suppression of the thermal conductivity is originated in a spin-phonon coupling which causes the resonance effects in the spin subsystem. In the case of Br sample, the result of our analysis supports the intertetrahedra mean-field coupling model [2]. The origin of the thermal conductivity enhancement below the transition temperature is not completely understood. It might be caused by the change of spin-phonon coupling constant ; in that case, one can conclude that the coupling is stronger on the Cl sample. The other explanation includes the heat conduction of magnon modes, which are observed by Raman scattering experiments [3]. [1] M. Prester et al., Phys. Rev. B 69 (2004) 024512. [2] C. Gros et al., Phys. Rev. B 67 (2003) 174405. [3] J. Jensen et al., Europhys. Lett. 64 (2003) 689.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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