Naslov
Probing the spin-gap in the HFM systems by thermal conductivity

Autori
Smontara, Ana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Izvornik
School and Workshop on Highly Frustrated Magnets and Strongly Correlated Systems: From Non-Pertubative Approaches to Experiments / - , 2007

Skup
School and Workshop on Highly Frustrated Magnets and Strongly Correlated Systems: From Non-Pertubative Approaches to Experiments

Mjesto i datum
Trst, Italija, 30.07.2007. - 17.08.2007

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
spin-gap antiferomagnets; thermal conductivity; spin excitations; spin-phonon interaction.

Sažetak
The spin-gap antiferomagnets have a discrete spin-energy spectrum due to the existence of only short-range spin correlations. The thermal conductivity is a tool that probes the spin excitations and spin-phonon interaction. A variety of phenomena are observed: for example, in various strontium-cuprates thermal conductivity is strongly enhanced due to the opening of the heat channel carried by either magnons or spinons ; in spin-Peierls compounds the heat transport exhibits rather unusual double peak at low temperatures, explained as a fingerprint of the spin-phonon resonance scattering. The thermal conductivity of strongly frustrated systems also shows the existence of spin-phonon resonance at low temperatures. We present the study of the thermal transport of several spin-gap antiferomagnets: (i) copper-tellurides, quasi-1D geomatrically frustrated compounds with S=1/2, (b) a "zig-zag"frustrated spin ladder system LiCu2O2 (S=1/2), and (c) quasi-2D S=1 system nickel-telluride. We find that the thermal conductivity of these systems exhibit behaviour typical for spin-phonon resonance coupling, and it gradually decreases as the dimensionality of the systems increase.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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