Nuclear magnetic relaxation of 1H in high-Tc superconductor YBa2Cu3O6.9Hx (x = 0.18 and 0.63)

K. Morimoto, W. Ye, S. Orimo, T. Takabatake, H. Fujii, T. Hihara

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14 Citations (Scopus)

Abstract

Spin-lattice relaxation time T1 (at 29 and 58 MHz) and T1ρ{variant} of 1H have been measured in YBa2Cu3O6.9Hx (x = 0.18 and 0.63) between 300 and 77 K. In the fresh sample with x = 0.18, T1 has a minimum near 260 K, which is attributed to the diffusion of hydrogen in the oxygen vacancies in the Cu(1)-O plane with an activation energy of Ea = 0.29 eV. For the sample with x = 0.63, another diffusion mode with Ea = 0.25 eV exists at lower temperature around 167 K. This mode might be due to the diffusion in the interstitial site in the Y-plane. But all of these modes disappeared in the temperature dependence of T1 after keeping the samples in ampoules in three months, and no evidence of diffusion was found either in T1ρ{variant} measurements. The temperature dependence of T1 for x = 0.18 showed an abrupt change at Tc ≊ 90 K, suggesting the effect of superconductivity.

Original languageEnglish
Pages (from-to)291-295
Number of pages5
JournalSolid State Communications
Volume71
Issue number4
DOIs
Publication statusPublished - 1989 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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