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Attractive Tomonaga-Luttinger liquid in a quantum spin ladder
M Jeong1, H Mayaffre1, C Berthier1
1Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UJF, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France.
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 (three-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
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