NMR study of high-Tc superconductors

K. Asayama; G. Q. Zheng; Y. Kitaoka; K. Ishida; K. Fujiwara

doi:10.1016/0921-4534(91)90075-A

NMR study of high-T_c superconductors

K. Asayama, G. Q. Zheng, Y. Kitaoka, K. Ishida, K. Fujiwara

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

From systematic measurements of T_c, Knight shift, NQR frequency of ⁶³Cu and ¹⁷O with high-pressure measurement in high-T_c materials, La_2-xSr_xCuO₄, YBa₂Cu₃O₇ and Tl₂Ba₂CuO_6+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. T_c 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 T_c has been discussed by assuming χ(Q) to play an essential role for the occurrence of high-T_c superconductivity. The T-dependence of 1/T₁ below T_c suggests strongly the d-wave pairing model.

Original language	English
Pages (from-to)	281-286
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	178
Issue number	4-6
DOIs	https://doi.org/10.1016/0921-4534(91)90075-A
Publication status	Published - Aug 1 1991
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "NMR study of high-Tc superconductors",

abstract = "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.",

author = "K. Asayama and Zheng, {G. Q.} and Y. Kitaoka and K. Ishida and K. Fujiwara",

year = "1991",

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T1 - NMR study of high-Tc superconductors

AU - Asayama, K.

AU - Zheng, G. Q.

AU - Kitaoka, Y.

AU - Ishida, K.

AU - Fujiwara, K.

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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