Cu nuclear spin-spin coupling in the dimer singlet state in SrCu2(BO3)2
- 18 April 2002
- journal article
- letter
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 14 (17) , L319-L325
- https://doi.org/10.1088/0953-8984/14/17/101
Abstract
We report results of nuclear magnetic resonance 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 π/2 and π 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 provide direct evidence for the dimer singlet ground state in this material.Keywords
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