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Phase diagram of infinite layer praseodymium nickelate Pr1–xSrxNiO2 thin films

Osada, Motoki ; Wang, Bai Yang ; Lee, Kyuho ; Li, Danfeng ; Hwang, Harold Y.

Physical review materials, 2020-12, Vol.4 (12) [Periódico revisado por pares]

United States: American Physical Society (APS)

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  • Título:
    Phase diagram of infinite layer praseodymium nickelate Pr1–xSrxNiO2 thin films
  • Autor: Osada, Motoki ; Wang, Bai Yang ; Lee, Kyuho ; Li, Danfeng ; Hwang, Harold Y.
  • Assuntos: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; MATERIALS SCIENCE
  • É parte de: Physical review materials, 2020-12, Vol.4 (12)
  • Notas: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
    Gordon and Betty Moore Foundation
    AC02-76SF00515; GBMF9072
  • Descrição: In this paper, we report the phase diagram of infinite layer Pr1-xSrxNiO2 thin films synthesized via topotactic reduction from the perovskite precursor phase using CaH2. Based on the electrical transport properties, we find a doping-dependent superconducting dome extending between x = 0.12 and 0.28, with a maximum superconducting transition temperature Tc of 14 K at x = 0.18, bounded by weakly insulating behavior on both sides. In contrast to the narrower dome observed in Nd1–xSrxNiO2, a local Tc suppression near x = 0.2 was not observed for the Pr1-xSrxNiO2 system. Normal state Hall effect measurements indicate mixed carrier contributions of both electrons and holes, and show a sign change in the Hall coefficient as functions of temperature and x, quite similar to that in Nd1-xSrxNiO2. Also similar is the observation of a minimum in the normal state resistivity associated with the superconducting compositions. These findings indicate an infinite layer nickelate phase diagram that is relatively insensitive to the rare-earth element, but suggest that disorder arising from the variations of the ionic radii on the rare-earth site affects the superconducting dome.
  • Editor: United States: American Physical Society (APS)
  • Idioma: Inglês
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