TY - JOUR
T1 - NMR study of high-Tc superconductors
AU - Asayama, K.
AU - Zheng, G. Q.
AU - Kitaoka, Y.
AU - Ishida, K.
AU - Fujiwara, K.
N1 - Funding Information:
The authorsw ish to expresst heir thankst o K. Yoshida and K. Hanzawafo r their valuabled iscus-sion on vQ. This work was partly supportedb y a Grant-in-Aid for Scientific Researcho n Priority Areas "Mechanismo f Superconductivitfyr"o m the Ministry of EducationS, ciencea nd Culture.
PY - 1991/8/1
Y1 - 1991/8/1
N2 - From systematic measurements of Tc, Knight shift, NQR frequency of 63Cu and 17O with high-pressure measurement in high-Tc materials, La2-xSrxCuO4, YBa2Cu3O7 and Tl2Ba2CuO6+y the following results have been obtained. The staggered susceptibility at the zone boundary, χ(Q) which is a measure of the antiferromagnetic spin fluctuation decreases in order of the La, Y and Tl system. χ(Q) is governed by the number of Cu d-holes, n(Cu) and O p-holes, n(O) in the CuO2 plane. χ(Q) increases when n(Cu)/n(O) increases. Tc increases and then decreases with n(Cu)/n(O) having a maximum at an optimum value of n(Cu)/ n(O). Correlation between χ(Q) and Tc has been discussed by assuming χ(Q) to play an essential role for the occurrence of high-Tc superconductivity. The T-dependence of 1/T1 below Tc suggests strongly the d-wave pairing model.
AB - From systematic measurements of Tc, Knight shift, NQR frequency of 63Cu and 17O with high-pressure measurement in high-Tc materials, La2-xSrxCuO4, YBa2Cu3O7 and Tl2Ba2CuO6+y the following results have been obtained. The staggered susceptibility at the zone boundary, χ(Q) which is a measure of the antiferromagnetic spin fluctuation decreases in order of the La, Y and Tl system. χ(Q) is governed by the number of Cu d-holes, n(Cu) and O p-holes, n(O) in the CuO2 plane. χ(Q) increases when n(Cu)/n(O) increases. Tc increases and then decreases with n(Cu)/n(O) having a maximum at an optimum value of n(Cu)/ n(O). Correlation between χ(Q) and Tc has been discussed by assuming χ(Q) to play an essential role for the occurrence of high-Tc superconductivity. The T-dependence of 1/T1 below Tc suggests strongly the d-wave pairing model.
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U2 - 10.1016/0921-4534(91)90075-A
DO - 10.1016/0921-4534(91)90075-A
M3 - Article
AN - SCOPUS:0026204707
VL - 178
SP - 281
EP - 286
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 4-6
ER -