Phase diagram of pressure-induced superconductivity in EuFe 2As2 probed by high-pressure resistivity up to 3.2 GPa

Nobuyuki Kurita, Motoi Kimata, Kota Kodama, Atsushi Harada, Megumi Tomita, Hiroyuki S. Suzuki, Takehiko Matsumoto, Keizo Murata, Shinya Uji, Taichi Terashima

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47 Citations (Scopus)

Abstract

We have constructed a pressure-temperature (P-T) phase diagram of P-induced superconductivity in EuFe2As2 single crystals via resistivity (ρ) measurements up to 3.2 GPa. As hydrostatic pressure is applied, the temperature T0 where an antiferromagnetic (AF) transition of the Fe moments and a structural phase transition occur shifts to lower temperatures, and the corresponding resistive anomaly becomes undetectable for P≥2.5 GPa. This suggests that the critical pressure Pc where T0 becomes zero is about 2.5 GPa. We have found that the AF order of the Eu2+ moments survives up to 3.2 GPa, the highest pressure in the experiments, without significant changes in the AF ordering temperature T N. The superconducting (SC) ground state with a sharp transition to zero resistivity at Tc~30 K, indicative of bulk superconductivity, emerges in a pressure range from Pc~2.5 to ~3.0 GPa. At pressures close to but outside the SC phase, the ρ(T) curve shows a partial SC transition (i.e., zero resistivity is not attained) followed by a reentrant-like hump at approximately TN with decreasing temperature. When nonhydrostatic pressure with a uniaxial-like strain component is applied using a solid pressure medium, the partial superconductivity is continuously observed in a wide pressure range from 1.1 to 3.2 GPa.

Original languageEnglish
Article number214513
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number21
DOIs
Publication statusPublished - 2011 Jun 10
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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