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

Abstract

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 $\le$ x $\le$ 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.

13 pages, 4 figures

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• Predicting Superconducting Transition Temperature through Advanced Machine Learning and Innovative Feature Engineering
• Superconductivity in 122-type antimonide BaPt${}_2$Sb${}_2$
• Superconductivity in Uncollapsed Tetragonal LaFe2As2
• Site-Selective Antimony Doping in Arsenic Zigzag Chains of 112-type Ca1-xLaxFeAs2
• Effects of post-annealing and cobalt co-doping on superconducting properties of (Ca,Pr)Fe2As2 single crystals
• Data analysis of $ab$ $initio$ effective Hamiltonians in iron-based superconductors $\unicode{x2014}$ Construction of predictors for superconducting critical temperature