A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(AS1-xPx)2.
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| Title: | A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe |
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| Authors: | 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. |
| Source: | Science (pre-March 2025). 6/22/2012, Vol. 336 Issue 6088, p1554-1557. 4p. |
| Subjects: | High temperature superconductors, Carrier density, Superfluidity, Critical point (Thermodynamics), Bose-Einstein condensation, Penetration depth (Superconductors), Absolute zero |
| 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/λL2) 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-xPx)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. [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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