Статья

Anomalously large gap anisotropy in the<i>a</i>-<i>b</i>plane of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi mathvariant="normal">δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Zhi‐Xun ShenDepartment of Applied Physics, Stanford University, Stanford, California 94305D. S. DessauDepartment of Applied Physics, Stanford University, Stanford, California 94305B. O. WellsDepartment of Applied Physics, Stanford University, Stanford, California 94305David M. KingDepartment of Applied Physics, Stanford University, Stanford, California 94305W. E. SpicerDepartment of Applied Physics, Stanford University, Stanford, California 94305A. J. ArkoDepartment of Applied Physics, Stanford University, Stanford, California 94305D. S. MarshallDepartment of Applied Physics, Stanford University, Stanford, California 94305L. W. LombardoDepartment of Applied Physics, Stanford University, Stanford, California 94305A. KapitulnikDepartment of Applied Physics, Stanford University, Stanford, California 94305P. H. DickinsonDepartment of Applied Physics, Stanford University, Stanford, California 94305Sebastian DoniachDepartment of Applied Physics, Stanford University, Stanford, California 94305J. DiCarloDepartment of Applied Physics, Stanford University, Stanford, California 94305T. LoeserDepartment of Applied Physics, Stanford University, Stanford, California 94305C. H. ParkDepartment of Applied Physics, Stanford University, Stanford, California 94305

1993lv

ABI

Аннотация

Superconducting gap anisotropy at least an order of magnitude larger than that of the conventional superconductors has been observed in the a-b plane of ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8+\mathrm{\ensuremath{\delta}}}$ in angle-resolved photoemission spectroscopy. For samples with ${\mathit{T}}_{\mathit{c}}$ of 88 K, the gap size reaches a maximum of approximately 20 meV along the Cu-O bond direction, and a minimum of much smaller or vanishing magnitude 45\ifmmode^\circ\else\textdegree\fi{} away. The experimental data are discussed within the context of various theoretical models. In particular, a detailed comparison with what is expected from a superconductor with a ${\mathit{d}}_{\mathit{x}}^{2}$-${\mathit{y}}^{2}$ order parameter is carried out, yielding a consistent picture.

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Идентификаторы

DOI: 10.1103/physrevlett.70.1553

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Цитирований: 3Использованных источников: 0

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