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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 BaFe2(AS1-xPx)2.
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]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe<subscript>2</subscript>(AS<subscript>1</subscript>-<subscript>x</subscript>P<subscript>x</subscript>)2.
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  Data: <searchLink fieldCode="AR" term="%22Hashimoto%2C+K%2E%22">Hashimoto, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Cho%2C+K%2E%22">Cho, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Shibauchi%2C+T%2E%22">Shibauchi, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Kasahara%2C+S%2E%22">Kasahara, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Mizukami%2C+Y%2E%22">Mizukami, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Katsumata%2C+R%2E%22">Katsumata, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Tsuruhara%2C+Y%2E%22">Tsuruhara, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Terashima%2C+T%2E%22">Terashima, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Ikeda%2C+H%2E%22">Ikeda, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Tanatar%2C+M%2E+A%2E%22">Tanatar, M. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Kitano%2C+H%2E%22">Kitano, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Salovich%2C+N%2E%22">Salovich, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Giannetta%2C+R%2E+W%2E%22">Giannetta, R. W.</searchLink><br /><searchLink fieldCode="AR" term="%22Walmsley%2C+P%2E%22">Walmsley, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Carrington%2C+A%2E%22">Carrington, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Prozorov%2C+R%2E%22">Prozorov, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Matsuda%2C+Y%2E%22">Matsuda, Y.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 6/22/2012, Vol. 336 Issue 6088, p1554-1557. 4p.
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  Data: <searchLink fieldCode="DE" term="%22High+temperature+superconductors%22">High temperature superconductors</searchLink><br /><searchLink fieldCode="DE" term="%22Carrier+density%22">Carrier density</searchLink><br /><searchLink fieldCode="DE" term="%22Superfluidity%22">Superfluidity</searchLink><br /><searchLink fieldCode="DE" term="%22Critical+point+%28Thermodynamics%29%22">Critical point (Thermodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Bose-Einstein+condensation%22">Bose-Einstein condensation</searchLink><br /><searchLink fieldCode="DE" term="%22Penetration+depth+%28Superconductors%29%22">Penetration depth (Superconductors)</searchLink><br /><searchLink fieldCode="DE" term="%22Absolute+zero%22">Absolute zero</searchLink>
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  Data: 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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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.1219821
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        Text: English
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      – SubjectFull: Penetration depth (Superconductors)
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      – SubjectFull: Absolute zero
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