Pregled bibliografske jedinice broj: 249378
Magnetic Ordering and Ergodicity in the Cu_2Te_2O_5X_2 Frustrated Spin System
Magnetic Ordering and Ergodicity in the Cu_2Te_2O_5X_2 Frustrated Spin System // From Solid State To BioPhysics III. Conference Proceedings / Forró, László ; Pavuna, Davor (ur.).
Lausanne: École Polytéchnique Fédérale de Lausanne (EPFL), 2006. (predavanje, međunarodna recenzija, sažetak, znanstveni)
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Naslov
Magnetic Ordering and Ergodicity in the Cu_2Te_2O_5X_2 Frustrated Spin System
Autori
Jagličić Z. ; El Shawish, S. ; Jeromen, A. ; Bilušić, Ante ; Smontara, Ana ; Trontelj, Z. ; Bonča, J. ; Dolinšek, J. ; Berger, H.
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
From Solid State To BioPhysics III. Conference Proceedings
/ Forró, László ; Pavuna, Davor - Lausanne : École Polytéchnique Fédérale de Lausanne (EPFL), 2006
Skup
From Solid State To BioPhysics III. International Conference
Mjesto i datum
Dubrovnik, Hrvatska; Cavtat, Hrvatska, 24.06.2006. - 01.07.2006
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
magnetically frustrated spin system; Cu_2Te_2O_5X_2; magnetic susceptibility; specific heat
Sažetak
We present an experimental and theoretical study of the magnetically frustrated spin system in pure and substitutionally disordered compounds from the Cu_2Te_2O_5X_2 family. Experimental magnetic susceptibilities and specific heats were analyzed simultaneously using models of (i) isolated tetrahedra of four antiferromagnetically coupled Cu^2+ spins and (ii) coupled tetrahedra within one-dimensional chains, in both cases involving mean-field coupling to other chains. The results show that the intracluster interactions are stronger than those between clusters, but the inter-cluster interactions are strong enough to suppress the intra-cluster singlet formation, so that Cu_2Te_2O_5X_2 compounds are true 3D systems of coupled spins. We found no clear evidence on the existence of a spin gap in the excitation spectrum. Though Cu^2+ spins are arranged in a geometrically frustrated tetrahedral antiferromagnetic configuration and spin correlation length ξ extends beyond the single tetrahedral cluster dimension, Cu_2Te_2O_5X_2 compounds do not exhibit ergodicity breaking at low temperatures, in contrast to the related geometrically frustrated kagomé and pyrochlore antiferromagnets.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
POVEZANOST RADA
Ustanove:
Institut za fiziku, Zagreb,
Prirodoslovno-matematički fakultet, Split
