Journal
ANNUAL REVIEW OF CONDENSED MATTER PHYSICS, VOL 5
Volume 5, Issue -, Pages 113-135Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-conmatphys-031113-133921
Keywords
antiferromagnetic fluctuations; unconventional superconductivity; strongly correlated electron systems; iron-based superconductors; quantum phase transition
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Funding
- EPSRC [EP/H025855/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H025855/1] Funding Source: researchfish
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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 QCPmay 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-xPx)(2) have provided the first clear and unambiguous evidence of a second-order quantum phase transition lying beneath the superconducting dome.
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