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research article
Thermodynamics of the Spin Luttinger Liquid in a Model Ladder Material
The phase diagram in temperature and magnetic field of the metal-organic, two-leg, spin-ladder compound (C5H12N)(2)CuBr4 is studied by measurements of the specific heat and the magnetocaloric effect. We demonstrate the presence of an extended spin Luttinger-liquid phase between two field-induced quantum critical points and over a broad range of temperature. Based on an ideal spin-ladder Hamiltonian, comprehensive numerical modeling of the ladder specific heat yields excellent quantitative agreement with the experimental data across the entire phase diagram.
Type
research article
Web of Science ID
WOS:000261704100058
Authors
Rueegg, Ch.
•
Kiefer, K.
•
Thielemann, B.
•
McMorrow, D. F.
•
Zapf, V.
•
Normand, B.
•
Zvonarev, M. B.
•
Bouillot, P.
•
Kollath, C.
•
Giamarchi, T.
Publication date
2008
Published in
Volume
101
Article Number
247202
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
November 30, 2010
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