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在施加磁场下，超导最佳掺杂的YBa2Cu3O7-x薄膜中从混合对称性到纯d波对称性的转变。

Transition from a mixed to a pure d-wave symmetry in superconducting optimally doped YBa2Cu3O7-x thin films under applied fields.

作者信息

Elhalel G, Beck R, Leibovitch G, Deutscher G

机构信息

School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel Aviv, 69978, Israel.

出版信息

Phys Rev Lett. 2007 Mar 30;98(13):137002. doi: 10.1103/PhysRevLett.98.137002.

DOI:10.1103/PhysRevLett.98.137002
PMID:17501232
Abstract

We have probed the Landau levels of nodal quasiparticles by tunneling along a nodal direction of (110) oriented YBa2Cu3O7-x thin films with a magnetic field applied perpendicular to the CuO2 planes, and parallel to the film's surface. In optimally doped films and at low temperature, finite energy nodal states are clearly observed in films thinner than the London penetration depth. Above a well defined temperature, the order parameter reverts to a pure d-wave symmetry.

摘要

我们通过在垂直于CuO₂平面且平行于薄膜表面施加磁场的情况下，沿着（110）取向的YBa₂Cu₃O₇₋ₓ薄膜的一个节点方向进行隧穿，来探测节点准粒子的朗道能级。在最佳掺杂的薄膜中且在低温下，在比伦敦穿透深度更薄的薄膜中清晰地观察到了有限能量的节点态。在一个明确的温度之上，序参量恢复为纯d波对称性。

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