TY - JOUR
T1 - Non-linear temperature dependence of Hg-O and Cu-O distances in Hg-1212 superconductor
AU - Yamawaki, Kouji
AU - Sasaki, Satoshi
AU - Kakihana, Masato
AU - Tanaka, Masahiko
N1 - Funding Information:
This study was partly performed under the auspices of the Photon Factory (PAC No. 95G-323 and 97G-219). This work was supported in part by JSPS-RFTF 96P00205.
PY - 2000/12/1
Y1 - 2000/12/1
N2 - The crystal structure of HgBa2CaCu2O6+δ (Hg-1212) has been carefully examined as a function of temperature by the single-crystal X-ray diffraction method. A significant anisotropy above the Tc (= 120 K) appeared on out-of-plane interatomic distances, such as Cu-O(2) and Hg-O(2), although the structural environment at room temperature is generally considered to maintain in the temperature vicinity of superconducting transition. On decreasing the temperature, the oxygen atom in the apical O(2) site of CuO5 pyramid approaches Hg atom and then leaves it. The anisotropic behavior would be precursor with superconductive charge-carriers, where the O(2) site plays the role of a `channel' between Hg charge reservoir and Cu-O superconducting plane.
AB - The crystal structure of HgBa2CaCu2O6+δ (Hg-1212) has been carefully examined as a function of temperature by the single-crystal X-ray diffraction method. A significant anisotropy above the Tc (= 120 K) appeared on out-of-plane interatomic distances, such as Cu-O(2) and Hg-O(2), although the structural environment at room temperature is generally considered to maintain in the temperature vicinity of superconducting transition. On decreasing the temperature, the oxygen atom in the apical O(2) site of CuO5 pyramid approaches Hg atom and then leaves it. The anisotropic behavior would be precursor with superconductive charge-carriers, where the O(2) site plays the role of a `channel' between Hg charge reservoir and Cu-O superconducting plane.
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U2 - 10.1016/S0921-4534(00)01322-8
DO - 10.1016/S0921-4534(00)01322-8
M3 - Article
AN - SCOPUS:0034516715
VL - 340
SP - 133
EP - 140
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 2-3
ER -