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

doi:10.1126/science.1219821

A sharp peak of the zero-temperature penetration depth at optimal composition in BaFe₂(As_1-xP_x)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

Physics

Research output: Contribution to journal › Article › peer-review

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, λ_L. In two-dimensional systems, this ratio n/m* (∼1/λ_L ²) determines the effective Fermi temperature, T_F. We report a sharp peak in the x-dependence of λ_L at zero temperature in clean samples of BaFe₂(As_1-xP _x)₂ at the optimum composition x = 0.30, where the superconducting transition temperature T_c reaches a maximum of 30 kelvin. This structure may arise from quantum fluctuations associated with a quantum critical point. The ratio of T_c/T_F at x = 0.30 is enhanced, implying a possible crossover toward the Bose-Einstein condensate limit driven by quantum criticality.

Original language	English (US)
Pages (from-to)	1554-1557
Number of pages	4
Journal	Science
Volume	336
Issue number	6088
DOIs	https://doi.org/10.1126/science.1219821
State	Published - Jun 22 2012

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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(As_1-xP_x)₂. Science, 336(6088), 1554-1557. https://doi.org/10.1126/science.1219821

Hashimoto, K, Cho, K, Shibauchi, T, Kasahara, S, Mizukami, Y, Katsumata, R, Tsuruhara, Y, Terashima, T, Ikeda, H, Tanatar, MA, Kitano, H, Salovich, N, Giannetta, RW, Walmsley, P, Carrington, A, Prozorov, R & Matsuda, Y 2012, 'A sharp peak of the zero-temperature penetration depth at optimal composition in BaFe₂(As_1-xP_x)₂', Science, vol. 336, no. 6088, pp. 1554-1557. https://doi.org/10.1126/science.1219821

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

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.",

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

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T1 - A sharp peak of the zero-temperature penetration depth at optimal composition in BaFe2(As1-xPx)2

AU - Hashimoto, K.

AU - Cho, K.

AU - Shibauchi, T.

AU - Kasahara, S.

AU - Mizukami, Y.

AU - Katsumata, R.

AU - Tsuruhara, Y.

AU - Terashima, T.

AU - Ikeda, H.

AU - Tanatar, M. A.

AU - Kitano, H.

AU - Salovich, N.

AU - Giannetta, R. W.

AU - Walmsley, P.

AU - Carrington, A.

AU - Prozorov, R.

AU - Matsuda, Y.

PY - 2012/6/22

Y1 - 2012/6/22

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