Cu nuclear spin-spin coupling in the dimer singlet state in SrCu2(BO3)2

Details Cu nuclear spin-spin coupling in the dimer singlet state in SrCu2(BO3)2 Cu nuclear spin-spin coupling in the dimer singlet state in SrCu2(BO3)2

2002-03-21

arxiv.org/abs/cond-mat/0203426v1

Physics

Condensed Matter

Strongly Correlated Electrons

7pages, 6 figures, submitted to J. Phys.:condens. matter

Scientific paper

10.1088/0953-8984/14/17/101

We report results of nuclear magnetic resonance (NMR) experiments in SrCu2(BO3)2, a quasi two-dimensional spin system with a singlet ground state. When magnetic field is applied along the c-axis, each of the quadrupole split Cu resonance lines splits further into four lines. The spin-echo intensity for some of the split lines oscillates against the separation time between the pai/2 and the pai rf-pulses. These phenomena are due to strong nuclear spin-spin coupling mediated by the electronic spin system, which exists only within a pair of nuclei. Thus the results provides direct evidence for the dimer singlet gorund state in this material.

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