Luttinger liquid physics in the spin ladder material CuBr4(C5H12N)2

Abstract : We present a 14N nuclear magnetic resonance study of a single crystal of CuBr4(C5H12N)2 consisting of weakly coupled spin-1/2 Heisenberg antiferromagnetic ladders. When placed in a magnetic field, such a ladder is theoretically predicted to exhibit a quantum critical Luttinger liquid (LL) behaviour in the gapless phase, i.e. between the two critical fields. Treating ladders as LLs and interaction between them as a perturbation, we are indeed able to fully account for (i) the spin dynamics accessed by measuring the spin–lattice relaxation rate equation image, and for (ii) the phase transition to a 3D ordered phase occurring below 110 mK due to the weak interladder coupling.
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Submitted on : Thursday, February 10, 2011 - 8:04:47 PM
Last modification on : Friday, October 11, 2019 - 8:22:56 PM

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M. Klanjšek, H. Mayaffre, C. Berthier, M. Horvatić, B. Chiari, et al.. Luttinger liquid physics in the spin ladder material CuBr4(C5H12N)2. Quantum Criticality and Novel Phases (QCNP 2009), Frank Steglich, Oliver Stockert and Steffen Wirth, Aug 2009, Dresden, Germany. pp.656, ⟨10.1002/pssb.200983048⟩. ⟨ensl-00565064⟩

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