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Luttinger liquid physics in the spin ladder material CuBr 4 (C 5 H 12 N) 2
Author(s) -
Klanjšek M.,
Mayaffre H.,
Berthier C.,
Horvatić M.,
Chiari B.,
Piovesana O.,
Bouillot P.,
Kollath C.,
Orignac E.,
Citro R.,
Giamarchi T.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200983048
Subject(s) - condensed matter physics , antiferromagnetism , luttinger liquid , physics , gapless playback , quantum spin liquid , spin (aerodynamics) , critical field , phase transition , magnetic field , lattice (music) , quantum , superconductivity , spin polarization , quantum mechanics , electron , thermodynamics , acoustics
We present a 14 N nuclear magnetic resonance study of a single crystal of CuBr 4 (C 5 H 12 N) 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 $T_1^{ - 1}$ , and for (ii) the phase transition to a 3D ordered phase occurring below 110 mK due to the weak interladder coupling.