Phys. Rev. Lett. 80, 2713–2716 (1998)Nuclear Magnetic Resonance Study of the S = 1/2 Heisenberg Ladder Cu2(C5H12N2)2Cl4: Quantum Phase Transition and Critical DynamicsReceived 12 August 1997; published in the issue dated 23 March 1998 We present an extensive NMR study of the spin-1/2 antiferromagnetic Heisenberg ladder Cu2(C5H12N2)2Cl4 in a magnetic field range 4.5–16.7 T. By measuring the proton NMR relaxation rate 1/T1 and varying the magnetic field around the critical field Hc1 = Δ/gμB≈7.5T, we have studied the transition from a gapped spin liquid ground state to a gapless magnetic regime which can be described as a Luttinger liquid. We identify an intermediate regime T≥|H-Hc1|, where the spin dynamics is (possibly) only controlled by the T = 0 critical point Hc1. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.2713
DOI:
10.1103/PhysRevLett.80.2713
PACS:
75.10.Jm, 75.40.Cx, 76.60.-k
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