A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe 2 (As 1

A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe 2 (As 1– x P x ) 2

Published:2012-06-22 Issue:6088 Volume:336 Page:1554-1557
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Hashimoto K.¹,Cho K.²³,Shibauchi T.¹,Kasahara S.¹⁴,Mizukami Y.¹,Katsumata R.¹,Tsuruhara Y.¹,Terashima T.⁴,Ikeda H.¹,Tanatar M. A.²,Kitano H.⁵,Salovich N.⁶,Giannetta R. W.⁶,Walmsley P.⁷,Carrington A.⁷,Prozorov R.²³,Matsuda Y.¹

Affiliation:

1. Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

2. The Ames Laboratory, Ames, IA 5001, USA.

3. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA.

4. Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8501, Japan.

5. Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan.

6. Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801, USA.

7. H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, UK.

Abstract

A Spike Inside the Dome The transition temperature T c of iron-based superconductors has a dome-shaped dependence on chemical doping, and the superconductivity that develops underneath may obscure a potential quantum critical point (QCP) residing at absolute zero. With the aim of detecting signatures of this quantum criticality, Hashimoto et al. (p 1554 ; see the Perspective by

Sachdev

) measured the penetration depth of the pnictide series BaFe 2 (As 1− x P x ) 2 as a function of x. A sharp peak right around the point where T c has a maximum ( x = 0.30) was observed, implying that the superfluid density diminishes sharply where one would expect it to be the most robust. This unusual finding is interpreted as a sign of a QCP at x = 0.30.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference41 articles.

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