TY - JOUR
T1 - Structural changes and redistribution of holes in Ca-doped YBa2Cu4O8
AU - Berastegui, Pedro
AU - Kakihana, Masato
AU - Eriksson, Sten G.
AU - Nishio, Shigeru
AU - Mazaki, Hiromasa
AU - Yasuoka, Hiroshi
AU - Osada, Minoru
AU - Yashima, Masatomo
AU - Yoshimura, Masahiro
PY - 1994
Y1 - 1994
N2 - The crystal structure of (Y1-xCax)Ba2Cu4O8 at room temperature has been refined by Rietveld analysis of time-of-flight (TOF) neutron powder diffraction data. The largest changes upon Ca doping involve the O(2) and O(3) ions in the Cu(2)O2 plane which move towards the Ba ion, while the Cu(2)-Cu(2) plane distance decreases. The complex magnetic susceptibility measurements have shown that the superconducting transition temperature, Tc increases from 81.3 K for x=0.0 to 89.9 K for x=0.1. Calculation of Madelung energies based upon the structural data has shown that the number of holes in the conducting Cu(2)O2 plane increases with increasing Ca content, which is qualitatively consistent with the observed increase in Tc.
AB - The crystal structure of (Y1-xCax)Ba2Cu4O8 at room temperature has been refined by Rietveld analysis of time-of-flight (TOF) neutron powder diffraction data. The largest changes upon Ca doping involve the O(2) and O(3) ions in the Cu(2)O2 plane which move towards the Ba ion, while the Cu(2)-Cu(2) plane distance decreases. The complex magnetic susceptibility measurements have shown that the superconducting transition temperature, Tc increases from 81.3 K for x=0.0 to 89.9 K for x=0.1. Calculation of Madelung energies based upon the structural data has shown that the number of holes in the conducting Cu(2)O2 plane increases with increasing Ca content, which is qualitatively consistent with the observed increase in Tc.
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U2 - 10.1016/0921-4534(94)91412-5
DO - 10.1016/0921-4534(94)91412-5
M3 - Article
AN - SCOPUS:24544468547
SN - 0921-4534
VL - 235-240
SP - 377
EP - 378
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - PART 1
ER -