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Diverging thermal expansion of the spin-ladder system (C5H12N)(2)CuBr4

Lorenz, T; Heyer, O; Garst, M; Anfuso, F; Rosch, A; Ruegg, C; Kramer, K; (2008) Diverging thermal expansion of the spin-ladder system (C5H12N)(2)CuBr4. PHYS REV LETT , 100 (6) , Article 067208. 10.1103/PhysRevLett.100.067208. Green open access

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Abstract

We present high-resolution measurements of the c(star)-axis thermal expansion and magnetostriction of piperidinium copper bromide (C5H12N)(2)CuBr4. The experimental data at low temperatures are well accounted for by a two-leg spin-ladder Hamiltonian. The thermal expansion shows a complex behavior with various sign changes and approaches a 1 root T divergence at the critical fields. All low-temperature features are semiquantitatively explained within a free-fermion model; full quantitative agreement is obtained with quantum Monte Carlo simulations.

Type: Article
Title: Diverging thermal expansion of the spin-ladder system (C5H12N)(2)CuBr4
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.100.067208
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.100.067208
Language: English
Additional information: © 2008 The American Physical Society
Keywords: MAGNETIC-FIELD, ANTIFERROMAGNETS, TLCUCL3
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/150046
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