Pressure-Induced Superconductivity from Doping-Induced Antiferromagnetic Phase of 112-type Ca1−xLaxFeAs2

Shunsaku Kitagawa, Taishi Sekiya, Yo Fujiyoshi, Shingo Araki, Tatsuo C. Kobayashi, Naoki Nishimoto, Tasuku Mizukami, Satoshi Ioka, Kazunori Fujimura, Kazutaka Kudo, Minoru Nohara

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Abstract

The effects of pressure on antiferromagnetic (AFM) and superconducting phase transitions of 112-type Ca1xLaxFeAs2 were studied, and the in-plane electrical resistivity ρab was measured with an indenter-type pressure cell. The AFM phase transition temperatures of TN = 47, 63, and 63 K at ambient pressure for x = 0.18, 0.21, and 0.26 was suppressed by applying pressure P, with superconductivity emerging at critical pressures of Pc ≃ 0, 1.5, and 3.4 GPa, respectively. Correspondingly, the slope of TN against P decreased as dTN/P ≃ −15 and −2 K/GPa for x = 0.21 and 0.26, respectively. Thus, although the AFM phase was stabilized with La doping x, the AFM phase was suppressed by pressure, and superconductivity eventually emerged.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - Nov 1 2017

ASJC Scopus subject areas

  • General

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