NQR investigation of high Tc superconductors under pressure

Guo qing Zheng; Etsuya Yanase; Kenji Ishida; Yoshio Kitaoka; Kunisuke Asayama; Yasuharu Kodama; Ritsu Tanaka; Sei Nakamichi; Shoichi Endo

doi:10.1016/0038-1098(91)90478-E

NQR investigation of high T_c superconductors under pressure

Guo qing Zheng, Etsuya Yanase, Kenji Ishida, Yoshio Kitaoka, Kunisuke Asayama, Yasuharu Kodama, Ritsu Tanaka, Sei Nakamichi, Shoichi Endo

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

26 Citations (Scopus)

Abstract

The pressure dependence of the ⁶³Cu nuclear quadrupole resonance (NQR) frequency, ν_Q, and T_c have been measured for La_1.85Sr_0.15CuO₄ and YBa₂Cu₄O₈ under high pressure up to 1.3GPa. ν_Q was found to decrease with increasing pressure in La_1.85Sr_0.15CuO₄, while ν_Q in the CuO₂ plane increases with pressure in YBa₂Cu₄O₈. It is evidenced that charge transfer takes place under pressure. Based on the analysis that ν_Q arises mainly from the on-site holes, a schematic model relating T_c and the ratio of the in-plane hole concentration in the Cu3d and O2p orbitals, n(Cu)/n(O), is constructed. It is proposed that n(Cu)/n(O) is a primarily important factor governing T_c and that the enhancement of T_c under pressure is due to the change of the ratio approaching the most favorable value (∼1).

Original language	English
Pages (from-to)	51-55
Number of pages	5
Journal	Solid State Communications
Volume	79
Issue number	1
DOIs	https://doi.org/10.1016/0038-1098(91)90478-E
Publication status	Published - Jul 1991
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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title = "NQR investigation of high Tc superconductors under pressure",

abstract = "The pressure dependence of the 63Cu nuclear quadrupole resonance (NQR) frequency, νQ, and Tc have been measured for La1.85Sr0.15CuO4 and YBa2Cu4O8 under high pressure up to 1.3GPa. νQ was found to decrease with increasing pressure in La1.85Sr0.15CuO4, while νQ in the CuO2 plane increases with pressure in YBa2Cu4O8. It is evidenced that charge transfer takes place under pressure. Based on the analysis that νQ arises mainly from the on-site holes, a schematic model relating Tc and the ratio of the in-plane hole concentration in the Cu3d and O2p orbitals, n(Cu)/n(O), is constructed. It is proposed that n(Cu)/n(O) is a primarily important factor governing Tc and that the enhancement of Tc under pressure is due to the change of the ratio approaching the most favorable value (∼1).",

author = "Zheng, {Guo qing} and Etsuya Yanase and Kenji Ishida and Yoshio Kitaoka and Kunisuke Asayama and Yasuharu Kodama and Ritsu Tanaka and Sei Nakamichi and Shoichi Endo",

year = "1991",

month = jul,

doi = "10.1016/0038-1098(91)90478-E",

language = "English",

volume = "79",

pages = "51--55",

journal = "Solid State Communications",

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T1 - NQR investigation of high Tc superconductors under pressure

AU - Zheng, Guo qing

AU - Yanase, Etsuya

AU - Ishida, Kenji

AU - Kitaoka, Yoshio

AU - Asayama, Kunisuke

AU - Kodama, Yasuharu

AU - Tanaka, Ritsu

AU - Nakamichi, Sei

AU - Endo, Shoichi

PY - 1991/7

Y1 - 1991/7

N2 - The pressure dependence of the 63Cu nuclear quadrupole resonance (NQR) frequency, νQ, and Tc have been measured for La1.85Sr0.15CuO4 and YBa2Cu4O8 under high pressure up to 1.3GPa. νQ was found to decrease with increasing pressure in La1.85Sr0.15CuO4, while νQ in the CuO2 plane increases with pressure in YBa2Cu4O8. It is evidenced that charge transfer takes place under pressure. Based on the analysis that νQ arises mainly from the on-site holes, a schematic model relating Tc and the ratio of the in-plane hole concentration in the Cu3d and O2p orbitals, n(Cu)/n(O), is constructed. It is proposed that n(Cu)/n(O) is a primarily important factor governing Tc and that the enhancement of Tc under pressure is due to the change of the ratio approaching the most favorable value (∼1).

AB - The pressure dependence of the 63Cu nuclear quadrupole resonance (NQR) frequency, νQ, and Tc have been measured for La1.85Sr0.15CuO4 and YBa2Cu4O8 under high pressure up to 1.3GPa. νQ was found to decrease with increasing pressure in La1.85Sr0.15CuO4, while νQ in the CuO2 plane increases with pressure in YBa2Cu4O8. It is evidenced that charge transfer takes place under pressure. Based on the analysis that νQ arises mainly from the on-site holes, a schematic model relating Tc and the ratio of the in-plane hole concentration in the Cu3d and O2p orbitals, n(Cu)/n(O), is constructed. It is proposed that n(Cu)/n(O) is a primarily important factor governing Tc and that the enhancement of Tc under pressure is due to the change of the ratio approaching the most favorable value (∼1).

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