TY - JOUR
T1 - NMR evidence for the spin gap behavior in Cu2PO4OH
AU - Kuo, C. N.
AU - Lue, C. S.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.78.212407
DO - 10.1103/PhysRevB.78.212407
M3 - Article
AN - SCOPUS:57949085896
VL - 78
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 21
M1 - 212407
ER -