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

Research output: Contribution to journalArticle

26 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)51-55
Number of pages5
JournalSolid State Communications
Volume79
Issue number1
DOIs
Publication statusPublished - 1991
Externally publishedYes

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Nuclear quadrupole resonance
nuclear quadrupole resonance
Superconducting materials
circuit diagrams
pressure dependence
Hole concentration
charge transfer
Schematic diagrams
orbitals
Charge transfer
augmentation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Zheng, G-Q., Yanase, E., Ishida, K., Kitaoka, Y., Asayama, K., Kodama, Y., ... Endo, S. (1991). NQR investigation of high Tc superconductors under pressure. Solid State Communications, 79(1), 51-55. https://doi.org/10.1016/0038-1098(91)90478-E

NQR investigation of high Tc superconductors under pressure. / Zheng, Guo-Qing; Yanase, Etsuya; Ishida, Kenji; Kitaoka, Yoshio; Asayama, Kunisuke; Kodama, Yasuharu; Tanaka, Ritsu; Nakamichi, Sei; Endo, Shoichi.

In: Solid State Communications, Vol. 79, No. 1, 1991, p. 51-55.

Research output: Contribution to journalArticle

Zheng, G-Q, Yanase, E, Ishida, K, Kitaoka, Y, Asayama, K, Kodama, Y, Tanaka, R, Nakamichi, S & Endo, S 1991, 'NQR investigation of high Tc superconductors under pressure', Solid State Communications, vol. 79, no. 1, pp. 51-55. https://doi.org/10.1016/0038-1098(91)90478-E
Zheng, Guo-Qing ; Yanase, Etsuya ; Ishida, Kenji ; Kitaoka, Yoshio ; Asayama, Kunisuke ; Kodama, Yasuharu ; Tanaka, Ritsu ; Nakamichi, Sei ; Endo, Shoichi. / NQR investigation of high Tc superconductors under pressure. In: Solid State Communications. 1991 ; Vol. 79, No. 1. pp. 51-55.
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AU - Ishida, Kenji

AU - Kitaoka, Yoshio

AU - Asayama, Kunisuke

AU - Kodama, Yasuharu

AU - Tanaka, Ritsu

AU - Nakamichi, Sei

AU - Endo, Shoichi

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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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