Cu NMR and NQR studies of high-Tc superconductor La 2-xSrxCuO4

Shigeki Ohsugi, Yoshio Kitaoka, Kenji Ishida, Guo-Qing Zheng, Kunisuke Asayama

Research output: Contribution to journalArticle

142 Citations (Scopus)

Abstract

Results of extensive Cu NMR and NQR studies in the superconducting La 2-xSrxCuO4 with x=0.075-0.24 have been presented. The rapid decrease of the nuclear spin-lattice relaxation rate, 1/T1, and the spin Knight shift below Tc confirm microscopically the existence of the superconducting phase with lower T c than 38 K for 0.10≦x≦0.24. For x=0.10, magnetic anomalies emerge at low-T in some small parts of the sample, e.g. T-independent T 1 and broadening of spectrum, having some relevance to the magnetic order in La2-xBaxCuO4 with x= 0.125. For x>0.15, the T1T=const. behavior and the existence of the residual spin Knight shift far below Tc have revealed that the superconductivity is of a gapless type with a finite density of states at the Fermi level caused by the mixture of different structures, i.e. tetragonal and orthorhombic.

Original languageEnglish
Pages (from-to)700-715
Number of pages16
JournalJournal of the Physical Society of Japan
Volume63
Issue number2
Publication statusPublished - Feb 1994
Externally publishedYes

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nuclear magnetic resonance
magnetic anomalies
spin-lattice relaxation
nuclear spin
superconductivity

Keywords

  • Antiferromagnetic spin correlation
  • Cu NMR and NQR
  • d-wave
  • Gapless superconductivity
  • High-T superconductivity
  • LaSrCuO
  • Structural instability

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ohsugi, S., Kitaoka, Y., Ishida, K., Zheng, G-Q., & Asayama, K. (1994). Cu NMR and NQR studies of high-Tc superconductor La 2-xSrxCuO4 . Journal of the Physical Society of Japan, 63(2), 700-715.

Cu NMR and NQR studies of high-Tc superconductor La 2-xSrxCuO4 . / Ohsugi, Shigeki; Kitaoka, Yoshio; Ishida, Kenji; Zheng, Guo-Qing; Asayama, Kunisuke.

In: Journal of the Physical Society of Japan, Vol. 63, No. 2, 02.1994, p. 700-715.

Research output: Contribution to journalArticle

Ohsugi, S, Kitaoka, Y, Ishida, K, Zheng, G-Q & Asayama, K 1994, 'Cu NMR and NQR studies of high-Tc superconductor La 2-xSrxCuO4 ', Journal of the Physical Society of Japan, vol. 63, no. 2, pp. 700-715.
Ohsugi, Shigeki ; Kitaoka, Yoshio ; Ishida, Kenji ; Zheng, Guo-Qing ; Asayama, Kunisuke. / Cu NMR and NQR studies of high-Tc superconductor La 2-xSrxCuO4 . In: Journal of the Physical Society of Japan. 1994 ; Vol. 63, No. 2. pp. 700-715.
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N2 - Results of extensive Cu NMR and NQR studies in the superconducting La 2-xSrxCuO4 with x=0.075-0.24 have been presented. The rapid decrease of the nuclear spin-lattice relaxation rate, 1/T1, and the spin Knight shift below Tc confirm microscopically the existence of the superconducting phase with lower T c than 38 K for 0.10≦x≦0.24. For x=0.10, magnetic anomalies emerge at low-T in some small parts of the sample, e.g. T-independent T 1 and broadening of spectrum, having some relevance to the magnetic order in La2-xBaxCuO4 with x= 0.125. For x>0.15, the T1T=const. behavior and the existence of the residual spin Knight shift far below Tc have revealed that the superconductivity is of a gapless type with a finite density of states at the Fermi level caused by the mixture of different structures, i.e. tetragonal and orthorhombic.

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