A quantum critical point lying beneath the superconducting dome in iron pnictides

T. Shibauchi, A. Carrington, Y. Matsuda

Research output: Contribution to journalArticle (Academic Journal)

175 Citations (Scopus)

Abstract

Whether a quantum critical point (QCP) lies beneath the superconducting dome has been a long-standing issue that remains unresolved in many classes of unconventional superconductors, notably cuprates, heavy fermions, and, most recently, iron pnictides. The existence of a QCP may offer a route to understanding the origin of unconventional superconductors' anomalous non-Fermi liquid properties, the microscopic coexistence between unconventional superconductivity and magnetic or some other exotic order, and, ultimately, the mechanism of superconductivity itself. The isovalent substituted iron pnictide BaFe2(As1-xPx)2 offers a new platform for the study of quantum criticality, providing a unique opportunity to study the evolution of the electronic properties in a wide range of the phase diagram. Recent experiments in BaFe2(As1-xP x)2 have provided the first clear and unambiguous evidence of a second-order quantum phase transition lying beneath the superconducting dome.

Original languageEnglish
Pages (from-to)113-135
Number of pages23
JournalAnnual Review of Condensed Matter Physics
Volume5
Issue number1
DOIs
Publication statusPublished - 2014

Keywords

  • antiferromagnetic fluctuations
  • iron-based superconductors
  • quantum phase transition
  • strongly correlated electron systems
  • unconventional superconductivity

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