Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe2As2

Kudo Kazutaka<sup>*</sup>; Iba Keita; Takasuga Masaya; Kitahama Yutaka; Matsumura Jun ichi; Danura Masataka; Nogami Yoshio; Nohara Minoru

doi:10.1038/srep01478

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Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe2As2

作者：Kudo Kazutaka^*; Iba Keita; Takasuga Masaya; Kitahama Yutaka; Matsumura Jun ichi; Danura Masataka; Nogami Yoshio; Nohara Minoru

来源：Scientific Reports, 2013, 3(1): 1478.

DOI：10.1038/srep01478

摘要

Co-doping of lanthanum and phosphorus in CaFe2As2 induces superconductivity at 45 K. This superconducting transition temperature is higher than the 38 K transition in Ba1-xKxFe2As2, which is the maximum found thus far among the 122 phases. Superconductivity with a substantial shielding volume fraction was observed at 0.12 %26lt;= x %26lt;= 0.18 and y = 0.06 in Ca1-xLaxFe2(As1-yPy)(2). The superconducting phase of the present system seems to be not adjacent to an antiferromagnetic phase.