Abstract
We report a combined study of the specific heat and de Haas-van Alphen effect in the iron-pnictide superconductor BaFe2(As(1-x)P(x))2. Our data when combined with results for the magnetic penetration depth give compelling evidence for the existence of a quantum critical point close to x=0.30 which affects the majority of the Fermi surface by enhancing the quasiparticle mass. The results show that the sharp peak in the inverse superfluid density seen in this system results from a strong increase in the quasiparticle mass at the quantum critical point.
Highlights
There has been much interest in the idea that superconductivity in the iron pnictides is boosted by the presence of a quantum critical point (QCP) located at the zero temperature end point of an antiferromagnetic phase transition [1]
Our data when combined with results for the magnetic penetration depth give compelling evidence for the existence of a quantum critical point close to x 1⁄4 0:30 which affects the majority of the Fermi surface by enhancing the quasiparticle mass
The results show that the sharp peak in the inverse superfluid density seen in this system results from a strong increase in the quasiparticle mass at the quantum critical point
Summary
There has been much interest in the idea that superconductivity in the iron pnictides is boosted by the presence of a quantum critical point (QCP) located at the zero temperature end point of an antiferromagnetic phase transition [1]. Quasiparticle Mass Enhancement Close to the Quantum Critical Point in BaFe2ðAs1ÀxPxÞ2
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