TY - JOUR
T1 - Metal-insulator transition and superconductivity in Sr- and La-substituted BaPb1-xBixO3
AU - Yamamoto, A.
AU - Furumochi, T.
AU - Tajima, S.
N1 - Funding Information:
The authors thank Dr. I. Terasaki of Waseda University and Dr. Y. Itoh of Superconducting Research Laboratory for useful discussions. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications.
PY - 1999/12/1
Y1 - 1999/12/1
N2 - Compositional boundaries of the metal-insulator transition (MIT) in Sr- and La-substituted BaPb1-xBixO3 (BPBO) were determined by dc susceptibility, electrical resistivity and thermoelectric power (TEP) measurements. By the 20% substitution of Sr for Ba, a Bi compositional range for metallic (superconducting) phase considerably extended to the Bi-rich region (x≈0.5), though BPBO exhibited metal (superconductivity) only below x = 0.3. On the other hand, by the 10% La substitution, a Bi range for metal (superconductivity) slightly decreased to the Bi-poor region (x≈0.25). Transport properties indicated that the MIT takes place at the lattice parameter ap≈4.29 angstroms, irrespective of the substitution elements. This suggests that the cell size determining the Bi-O orbital overlap and/or a magnitude of the band split, is one of the essential factors of the MIT in BPBO.
AB - Compositional boundaries of the metal-insulator transition (MIT) in Sr- and La-substituted BaPb1-xBixO3 (BPBO) were determined by dc susceptibility, electrical resistivity and thermoelectric power (TEP) measurements. By the 20% substitution of Sr for Ba, a Bi compositional range for metallic (superconducting) phase considerably extended to the Bi-rich region (x≈0.5), though BPBO exhibited metal (superconductivity) only below x = 0.3. On the other hand, by the 10% La substitution, a Bi range for metal (superconductivity) slightly decreased to the Bi-poor region (x≈0.25). Transport properties indicated that the MIT takes place at the lattice parameter ap≈4.29 angstroms, irrespective of the substitution elements. This suggests that the cell size determining the Bi-O orbital overlap and/or a magnitude of the band split, is one of the essential factors of the MIT in BPBO.
UR - http://www.scopus.com/inward/record.url?scp=0033324457&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033324457&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(99)00539-0
DO - 10.1016/S0921-4534(99)00539-0
M3 - Article
AN - SCOPUS:0033324457
VL - 328
SP - 118
EP - 124
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1
ER -