Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.21: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Specific heat of a Cu₃ spin tube — •Juergen Schnack¹ and Roman Schnalle² — ¹Universität Bielefeld, Fakultät für Physik, Postfach 100131, D-33501 Bielefeld — ²Universität Osnabrück, Fachbereich Physik, D-49069 Osnabrück

[(CuCl₂tachH)₃Cl]Cl₂ is a frustrated three-leg spin tube of antiferromagnetically coupled Cu spins with s=1/2 [1,2]. The T=0 phase diagram (gaps, plateaus) was discussed in e.g. [3,4]. Here we report on the specific heat of the spin tube which was determined experimentally. For low temperatures the specific heat is linear in temperature – reminiscent of a one-dimensional gapless spin chain – followed by a pronounced peak at higher temperatures. This behavior is discussed theoretically.

[1] J. Schnack et al., Phys. Rev. B 70, 174420 (2004).

[2] J. Schnack, C. R. Chimie 10, 15 (2007).

[3] A. Lüscher et al., Phys. Rev. B 70, 060405(R) (2004).

[4] J.-B. Fouet et al., Phys. Rev. B 73, 014409 (2006).