TY - JOUR
T1 - Characterization of the spin gap nature in Na 3Cu 2SbO 6 using 23Na NMR
AU - Kuo, C. N.
AU - Jian, T. S.
AU - Lue, C. S.
N1 - Funding Information:
This work was supported by the National Science Council of Taiwan under grant no. NSC-98-2112-M-006-011-MY3 (C.S.L) .
PY - 2012/8/5
Y1 - 2012/8/5
N2 - We report the results of a Na23 nuclear magnetic resonance (NMR) study on Na 3Cu 2SbO 6 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 T max 95 K. While the NMR shift data can be fitted well to both antiferromagnetic- antiferromagnetic (AF-AF) and antiferromagnetic-ferromagnetic (AF-F) alternating chain models, the former yields a spin gap of 62 K which is too small as compared to the value obtained from the neutron scattering measurement. On the other hand, a spin gap of about 112 K based on the AF-F alternating chain scenario is quite consistent with the reported value. In addition, the employment of the AF-F alternating chain picture to analyze the spin-lattice relaxation rate reveals a gap size of 105 K, in good agreement with the 8.9 meV peak observed in the inelastic neutron scattering experiment. With this accordance, we point out that the AF-F alternating chain picture is more appropriate for the understanding of the spin gap nature in Na 3Cu 2SbO 6.
AB - We report the results of a Na23 nuclear magnetic resonance (NMR) study on Na 3Cu 2SbO 6 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 T max 95 K. While the NMR shift data can be fitted well to both antiferromagnetic- antiferromagnetic (AF-AF) and antiferromagnetic-ferromagnetic (AF-F) alternating chain models, the former yields a spin gap of 62 K which is too small as compared to the value obtained from the neutron scattering measurement. On the other hand, a spin gap of about 112 K based on the AF-F alternating chain scenario is quite consistent with the reported value. In addition, the employment of the AF-F alternating chain picture to analyze the spin-lattice relaxation rate reveals a gap size of 105 K, in good agreement with the 8.9 meV peak observed in the inelastic neutron scattering experiment. With this accordance, we point out that the AF-F alternating chain picture is more appropriate for the understanding of the spin gap nature in Na 3Cu 2SbO 6.
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U2 - 10.1016/j.jallcom.2012.02.121
DO - 10.1016/j.jallcom.2012.02.121
M3 - Article
AN - SCOPUS:84860284360
SN - 0925-8388
VL - 531
SP - 1
EP - 4
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -