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High field mangetization, field-dependent specific heat measurements, andzero field inelastic magnetic neutron scattering have been used to explore themagnetic properties of copper pyrazine dinitrate (Cu(C4H4N2)(NO3)2). Thematerial is an ideal one-dimensional spin-1/2 Heisenberg antiferromagnet withnearest neighbor exchange constant J=0.90(1) meV and chains extending along theorthorhombic a-direction. As opposed to previosly studied molecular-basedspin-1/2 magnetic systems, coppyer pyrazine dinitrate remains gapless andparamagnetic for g mu_B H/J at least up to 1.4 and for k_B T/J at least down to0.03 this makes the material an excellent model system for exploring the T=0critical line which is expected in the H - T phase diagram on theone-dimensional spin-1/2 Heisenberg antiferromagnet. As a first example of sucha study we present accurate measurements of the Sommerfeld constant of thespinon gas versus g mu_B H/J < 1.4 which reveal a decrease of the averagesspinon velocity by 32% in that field range. The results are in excellentagreement with numerical calculations based on the Bethe ansatz with noadjustable parameters.Comment: 9 pages with figures included, 9 figures, Submitted to Phys. Rev. B  (8/31/98), email comments to dhr@pha.jhu.ed

physical review. b, condensed matter

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Characterization of a quasi-one-dimensional spin-1/2 magnet which is gapless and paramagnetic forgμBH≲Jandk