TY - JOUR
T1 - Superconductivity in the RE-123 phase of Lu0.5Ca0.5Ba1.4Sr0.6Cu3O6 without oxygen in the Cu–O chain
AU - Nakagawa, Kohei
AU - Noji, Takashi
AU - Kawamata, Takayuki
AU - Kato, Masatsune
N1 - Funding Information:
We would like to thank Y. Miyazaki and Y. Koike for helpful discussion. This work was supported by JSPS KAKENHI Grant Number JP15K06433 .
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/15
Y1 - 2020/1/15
N2 - Polycrystalline samples of Lu0.5Ca0.5Ba1.4Sr0.6Cu3O6 without oxygen in the blocking layer of the so-called Cu(1)O chain have been prepared by the conventional solid-state reaction method. The onset temperature of the superconducting transition Tc onset = 80 K observed in the magnetic susceptibility measurement for the sample with the oxygen content of 5.87 is the highest record in the REBa2Cu3O6 (RE: rare-earth element) phase. The hole concentration in the superconductive Cu(2)O2 plane estimated from the thermoelectric power at R. T. is about 0.12 (/Cu(2)), indicating that the sample is still situated in the underdoped region. We have also investigated the effect of the introduction of oxygen into the blocking layer on Tc. It has been found that Tc takes a minimum at 6 + δ ~ 6.1 and the maximum at 6 + δ ~ 6.5 in Lu0.5Ca0.5Ba1.4Sr0.6Cu3O6+ δ.
AB - Polycrystalline samples of Lu0.5Ca0.5Ba1.4Sr0.6Cu3O6 without oxygen in the blocking layer of the so-called Cu(1)O chain have been prepared by the conventional solid-state reaction method. The onset temperature of the superconducting transition Tc onset = 80 K observed in the magnetic susceptibility measurement for the sample with the oxygen content of 5.87 is the highest record in the REBa2Cu3O6 (RE: rare-earth element) phase. The hole concentration in the superconductive Cu(2)O2 plane estimated from the thermoelectric power at R. T. is about 0.12 (/Cu(2)), indicating that the sample is still situated in the underdoped region. We have also investigated the effect of the introduction of oxygen into the blocking layer on Tc. It has been found that Tc takes a minimum at 6 + δ ~ 6.1 and the maximum at 6 + δ ~ 6.5 in Lu0.5Ca0.5Ba1.4Sr0.6Cu3O6+ δ.
KW - Cuprate superconductor
KW - Elemental substitution
KW - Hole concentration
KW - RE-123 structure
KW - Superconducting transition temperature
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U2 - 10.1016/j.physc.2019.1353583
DO - 10.1016/j.physc.2019.1353583
M3 - Article
AN - SCOPUS:85076468653
SN - 0921-4534
VL - 568
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
M1 - 1353583
ER -