NMR evidence for the spin gap behavior in Cu2PO4OH

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Abstract

We report on the results of a P 31 nuclear-magnetic-resonance (NMR) study on Cu2PO4OH at temperatures between 4 and 300 K. This material has been a subject of current interest due to indications of spin gap behavior. The temperature-dependent NMR shift exhibits a character of low-dimensional magnetism with a broad maximum at Tmax ≃ 110 K. Below Tmax, the NMR shifts and spin-lattice relaxation rates clearly indicate activated responses, confirming the existence of a spin gap in Cu 2PO4OH. The experimental NMR data can be well fitted to the square spin tetramer (SQST) model, yielding a spin gap size of about 140 K. It thus points out that the nearly isolated SQST picture is proper for the understanding of the spin gap nature in Cu2PO4OH.

Original languageEnglish
Article number212407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number21
DOIs
Publication statusPublished - 2008 Dec 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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