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APS » Journals » Phys. Rev. Lett. » Volume 101 » Issue 13
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Phys. Rev. Lett. 101, 137207 (2008) [4 pages]

Controlling Luttinger Liquid Physics in Spin Ladders under a Magnetic Field

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M. Klanjšek1, H. Mayaffre2, C. Berthier1, M. Horvatić1, B. Chiari3, O. Piovesana3, P. Bouillot4, C. Kollath5, E. Orignac6, R. Citro7, and T. Giamarchi4
1Grenoble High Magnetic Field Laboratory, CNRS, F-38042 Grenoble Cedex 09, France
2Laboratoire de Spectrométrie Physique, Université J. Fourier and UMR5588 CNRS, F-38402 Saint Martin d’Hères, France
3Dipartimento di Chimica, Universitá di Perugia, I-06100 Perugia, Italy
4DPMC-MaNEP, University of Geneva, CH-1211 Geneva, Switzerland
5Centre de Physique Théorique, Ecole Polytechnique, CNRS, F-91128 Palaiseau Cedex, France
6LPENSL CNRS UMR 5672, F-69364 Lyon Cedex 07, France
7Dipartimento di Fisica “E. R. Caianiello” and CNISM, Università di Salerno, I-84100 Salerno, Italy

Received 10 June 2008; revised 28 July 2008; published 26 September 2008

We present a 14N nuclear magnetic resonance study of a single crystal of CuBr4(C5H12N)2 (BPCB) consisting of weakly coupled spin-1/2 Heisenberg antiferromagnetic ladders. Treating ladders in the gapless phase as Luttinger liquids, we are able to fully account for (i) the magnetic field dependence of the nuclear spin-lattice relaxation rate T1-1 at 250 mK and for (ii) the phase transition to a 3D ordered phase occurring below 110 mK due to weak interladder exchange coupling. BPCB is thus an excellent model system where the possibility to control Luttinger liquid parameters in a continuous manner is demonstrated and the Luttinger liquid model tested in detail over the whole fermion band.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.137207
DOI:
10.1103/PhysRevLett.101.137207
PACS:
75.10.Jm, 75.40.Cx, 76.60.−k
 
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