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We present an extensive NMR study of the spin-1/2 antiferromagneticHeisenberg ladder Cu2(C5H12N2)2Cl4 in a magnetic field range 4.5 - 16.7 T. Bymeasuring the proton NMR relaxation rate 1/T_1 and varying the magnetic fieldaround the critical field H_c1 = Delta / g\mu_B = 7.5 T, we have studied thetransition from a gapped spin liquid ground state to a gapless magnetic regimewhich can be described as a Luttinger liquid. We identify an intermediateregime T > |H-H_c1|, where the spin dynamics is (possibly) only controlled bythe T=0 critical point H_c1.Comment: 4 pages, 3 eps figures, submitted to Phys. Rev. Let

physical review letters

Nuclear Magnetic Resonance Study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">S</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn><mml:mn /></mml:math>Heisenberg Ladder<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml…

Nuclear Magnetic Resonance Study of theS=1/2Heisenberg LadderCu2(