Attractive Tomonaga-Luttinger Liquid in a Quantum Spin Ladder

M. Jeong; H. Mayaffre; C. Berthier; D. Schmidiger; A. Zheludev; M. Horvatić

doi:10.1103/PhysRevLett.111.106404

Attractive Tomonaga-Luttinger Liquid in a Quantum Spin Ladder

Strongly Correlated Electrons 2013-09-06 v1

Authors: M. Jeong , H. Mayaffre , C. Berthier , D. Schmidiger , A. Zheludev , M. Horvatić

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Abstract

We present NMR measurements of a strong-leg spin-1/2 Heisenberg antiferromagnetic ladder compound (C7H10N)2CuBr4 under magnetic fields up to 15 T in the temperature range from 1.2 K down to 50 mK. From the splitting of NMR lines we determine the phase boundary and the order parameter of the low-temperature (3-dimensional) long-range-ordered phase. In the Tomonaga-Luttinger regime above the ordered phase, NMR relaxation reflects characteristic power-law decay of spin correlation functions as 1/T1 T^(1/2K-1), which allows us to determine the interaction parameter K as a function of field. We find that field-dependent K varies within the 1<K<2 range which signifies attractive interaction between the spinless fermions in the Tomonaga-Luttinger liquid.

Keywords

Tomonaga-Luttinger liquid quantum spin ladder NMR measurements Heisenberg antiferromagnet spin correlation functions attractive interaction spinless fermions

Cite

@article{arxiv.1307.0103,
  title  = {Attractive Tomonaga-Luttinger Liquid in a Quantum Spin Ladder},
  author = {M. Jeong and H. Mayaffre and C. Berthier and D. Schmidiger and A. Zheludev and M. Horvatić},
  journal= {arXiv preprint arXiv:1307.0103},
  year   = {2013}
}

Attractive Tomonaga-Luttinger Liquid in a Quantum Spin Ladder

Abstract

Keywords

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