Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe2 As2

Kazutaka Kudo; Keita Iba; Masaya Takasuga; Yutaka Kitahama; Jun Ichi Matsumura; Masataka Danura; Yoshio Nogami; Minoru Nohara

doi:10.1038/srep01478

Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe₂ As₂

Kazutaka Kudo, Keita Iba, Masaya Takasuga, Yutaka Kitahama, Jun Ichi Matsumura, Masataka Danura, Yoshio Nogami, Minoru Nohara

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38 Citations (Scopus)

Abstract

Co-doping of lanthanum and phosphorus in CaFe₂ As₂ induces superconductivity at 45 K. This superconducting transition temperature is higher than the 38 K transition in Ba 1_-x K_x Fe ₂ As₂, which is the maximum found thus far among the 122 phases. Superconductivity with a substantial shielding volume fraction was observed at 0.12 ≤ x ≤ 0.18 and y = 0.06 in Ca_1-x La _x Fe₂ (As 1-y P y) 2. The superconducting phase of the present system seems to be not adjacent to an antiferromagnetic phase.

Original language	English
Article number	1478
Journal	Scientific reports
Volume	3
DOIs	https://doi.org/10.1038/srep01478
Publication status	Published - 2013

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Kudo, K., Iba, K., Takasuga, M., Kitahama, Y., Matsumura, J. I., Danura, M., Nogami, Y., & Nohara, M. (2013). Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe₂ As₂. Scientific reports, 3, [1478]. https://doi.org/10.1038/srep01478

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AU - Matsumura, Jun Ichi

AU - Danura, Masataka

AU - Nogami, Yoshio

AU - Nohara, Minoru

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AB - Co-doping of lanthanum and phosphorus in CaFe2 As2 induces superconductivity at 45 K. This superconducting transition temperature is higher than the 38 K transition in Ba 1-x Kx Fe 2 As2, which is the maximum found thus far among the 122 phases. Superconductivity with a substantial shielding volume fraction was observed at 0.12 ≤ x ≤ 0.18 and y = 0.06 in Ca1-x La x Fe2 (As 1-y P y) 2. The superconducting phase of the present system seems to be not adjacent to an antiferromagnetic phase.

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