Статья

Enhancement of the Critical Temperature of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>HgBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math>by Applying Uniaxial and Hydrostatic Pressure: Implications for a Universal Trend in Cuprate Superconductors

F. HardyInstitute for Solid State Physics, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, GermanyN. J. HillierDepartment of Physics, Washington University, CB 1105, One Brookings Drive, St. Louis, Missouri 63130, USAC. MeingastInstitute for Solid State Physics, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, GermanyD. ColsonService de Physique de l’Etat Condensé, Orme des Merisiers CEA Saclay, CNRS URA 2464, 91195 Gif-Sur-Yvette Cedex, FranceYilei LiDepartment of Physics, Stanford University, Stanford, California 94305, USAN. BarišićI. Physikaliches Institut, Universität Stuttgart, 70550 Stuttgart, GermanyGuichuan YuSchool of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 USAXudong ZhaoState Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, ChinaM. GrevenSchool of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 USAJ. S. SchillingDepartment of Physics, Washington University, CB 1105, One Brookings Drive, St. Louis, Missouri 63130, USA

2010lv

ABI

Аннотация

It is well known that the superconducting transition temperature (T(c)) of cuprate superconductors can be enhanced by varying certain structural and electronic parameters, such as the flatness of the CuO₂ planes or their doping level. We determine the uniaxial and hydrostatic pressure derivatives of T(c) in the structurally simple tetragonal compound HgBa₂CuO(4+δ) near optimal doping. Our results provide experimental evidence for two further methods to enhance T(c): (i) reducing the area of the CuO₂ planes, and (ii) increasing the separation of the CuO₂ planar groups. T(c) is found to couple much more strongly to the ratio c/a of the lattice constants than to the unit cell volume. A comparison with prior results for structurally more complicated cuprates reveals a general trend of uniaxial pressure derivatives with T(c).

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Идентификаторы

DOI: 10.1103/physrevlett.105.167002

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