Phys. Rev. Lett. 100, 067208 (2008) [4 pages]Diverging Thermal Expansion of the Spin-Ladder System (C5H12N)2CuBr4See Also: Publisher's Note Received 9 November 2007; published 15 February 2008; publisher error corrected 19 February 2008 We present high-resolution measurements of the c⋆-axis thermal expansion and magnetostriction of piperidinium copper bromide (C5H12N)2CuBr4. 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/√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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.067208
DOI:
10.1103/PhysRevLett.100.067208
PACS:
75.10.Jm, 75.40.Cx, 75.80.+q
See AlsoPublisher's Note: T. Lorenz, O. Heyer, M. Garst, F. Anfuso, A. Rosch, Ch. Rüegg, and K. Krämer, Publisher’s Note: Diverging Thermal Expansion of the Spin-Ladder System (C5H12N)2CuBr4 [Phys. Rev. Lett. 100, 067208 (2008)], Phys. Rev. Lett. 100, 089902 (2008). |
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