Doping dependence of the pressure response of Tc in the SmO 1-xFxFeAs superconductors

Yasuhiro Takabayashi, Martin T. McDonald, Dionisis Papanikolaou, Serena Margadonna, G. Wu, R. H. Liu, X. H. Chen, Kosmas Prassides

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The superconducting transition temperature of the high-Tc SmO1-xFxFeAs superconductors increases monotonically as the F-doping level x increases to 0.20. High-pressure magnetization experiments reveal a strong sensitivity of Tc to interatomic distances in the underdoped regime (x ≤ 0.12) with the pressure coefficient of Tc, d(lnTc)/dP being strongly positive. However, as the doping level increases further to x = 0.15, we find that this sensitivity is strongly suppressed and at the same time, d(lnTc)/dP sharply switches over to assume negative values with Tc decreasing with increasing applied pressure. The abrupt change in the pressure response of the superconducting properties of the SmO1-xFxFeAs phases coincides with the putative existence of a quantum critical point (QCP) near x ≈ 0.14, as proposed by resistivity and Hall effect measurements.

Original languageEnglish
Pages (from-to)9242-9243
Number of pages2
JournalJournal of the American Chemical Society
Volume130
Issue number29
DOIs
Publication statusPublished - 2008 Jul 23

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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