Quasiparticle Mass Enhancement Close to the Quantum Critical Point in BaFe2(As1-xPx)(2)

P. Walmsley*, C. Putzke, Liam D Malone, Isabel Guillamon Gomez, D. Vignolles, C. Proust, S. Badoux, A. I. Coldea, M. D. Watson, S. Kasahara, Y. Mizukami, T. Shibauchi, Y. Matsuda, A. Carrington

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

95 Citations (Scopus)


We report a combined study of the specific heat and de Haas-van Alphen effect in the iron-pnictide superconductor BaFe2(As1-xPx)(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.

Original languageEnglish
Article number257002
Number of pages5
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 21 Jun 2013


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