A sharp peak of the zero-temperature penetration depth at optimal composition in BaFe2(As1-xPx)2

K. Hashimoto, K. Cho, T. Shibauchi, S. Kasahara, Y. Mizukami, R. Katsumata, Y. Tsuruhara, T. Terashima, H. Ikeda, M. A. Tanatar, H. Kitano, N. Salovich, R. W. Giannetta, P. Walmsley, A. Carrington, R. Prozorov, Y. Matsuda

Research output: Contribution to journalArticle

Abstract

In a superconductor, the ratio of the carrier density, n, to its effective mass, m*, is a fundamental property directly reflecting the length scale of the superfluid flow, the London penetration depth, λL. In two-dimensional systems, this ratio n/m* (∼1/λL 2) determines the effective Fermi temperature, TF. We report a sharp peak in the x-dependence of λL at zero temperature in clean samples of BaFe2(As1-xP x)2 at the optimum composition x = 0.30, where the superconducting transition temperature Tc reaches a maximum of 30 kelvin. This structure may arise from quantum fluctuations associated with a quantum critical point. The ratio of Tc/TF at x = 0.30 is enhanced, implying a possible crossover toward the Bose-Einstein condensate limit driven by quantum criticality.

Original languageEnglish (US)
Pages (from-to)1554-1557
Number of pages4
JournalScience
Volume336
Issue number6088
DOIs
StatePublished - Jun 22 2012

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'A sharp peak of the zero-temperature penetration depth at optimal composition in BaFe<sub>2</sub>(As<sub>1-x</sub>P<sub>x</sub>)<sub>2</sub>'. Together they form a unique fingerprint.

  • Cite this

    Hashimoto, K., Cho, K., Shibauchi, T., Kasahara, S., Mizukami, Y., Katsumata, R., Tsuruhara, Y., Terashima, T., Ikeda, H., Tanatar, M. A., Kitano, H., Salovich, N., Giannetta, R. W., Walmsley, P., Carrington, A., Prozorov, R., & Matsuda, Y. (2012). A sharp peak of the zero-temperature penetration depth at optimal composition in BaFe2(As1-xPx)2. Science, 336(6088), 1554-1557. https://doi.org/10.1126/science.1219821