TY - JOUR
T1 - Oxygen deficiency and superconducting properties of Ba-Y-Cu oxide compounds
AU - Nakamura, K.
AU - Aoki, H.
AU - Matsushita, A.
AU - Kaise, S.
AU - Asada, Y.
AU - Matsumoto, T.
AU - Hoshi, T.
AU - Ogawa, K.
PY - 1987
Y1 - 1987
N2 - Orthorhombic-tetragonal phase relation of YBa2Cu3O7-δ has been determined by applying standard statistical thermodynamics. The resultant phase relation can explain the difference between the boundary value δ determined in situ by increasing temperature at a constant oxygen pressure and that determined at room temperature for quenched samples. It is shown that the orthorhombic-tetragonal phase boundry at room temperature extends to much higher δ value, i.e. 0.8, than hitherto expected. The sample heated to tetragonal region can transform to orthorhombic during the quenching process if δ is smaller than 0.8. From the resistivity data of the quenched and annealed samples, we imply that the role of Cu-O one-dimensional chain on the superconductivity is minor.
AB - Orthorhombic-tetragonal phase relation of YBa2Cu3O7-δ has been determined by applying standard statistical thermodynamics. The resultant phase relation can explain the difference between the boundary value δ determined in situ by increasing temperature at a constant oxygen pressure and that determined at room temperature for quenched samples. It is shown that the orthorhombic-tetragonal phase boundry at room temperature extends to much higher δ value, i.e. 0.8, than hitherto expected. The sample heated to tetragonal region can transform to orthorhombic during the quenching process if δ is smaller than 0.8. From the resistivity data of the quenched and annealed samples, we imply that the role of Cu-O one-dimensional chain on the superconductivity is minor.
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U2 - 10.1016/0378-4363(87)90222-1
DO - 10.1016/0378-4363(87)90222-1
M3 - Article
AN - SCOPUS:0023536903
VL - 148
SP - 318
EP - 321
JO - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics
JF - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics
SN - 0378-4363
IS - 1-3
ER -