TY - JOUR
T1 - Nuclear magnetic relaxation of 1H in high-Tc superconductor YBa2Cu3O6.9Hx (x = 0.18 and 0.63)
AU - Morimoto, K.
AU - Ye, W.
AU - Orimo, S.
AU - Takabatake, T.
AU - Fujii, H.
AU - Hihara, T.
PY - 1989/7
Y1 - 1989/7
N2 - 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.
AB - 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.
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U2 - 10.1016/0038-1098(89)91017-X
DO - 10.1016/0038-1098(89)91017-X
M3 - Article
AN - SCOPUS:0024705452
VL - 71
SP - 291
EP - 295
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 4
ER -