Anomalous Peak in the Superconducting Condensate Density of Cuprate High-TcSuperconductors at a Unique Doping State

2000/06/19 by C. Bernhard, J. L. Tallon, Th. Blasius +2 · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.86.1614

10 pages, 3 figures

arxiv created 2000/06/19 · openalex publication_date 2001/02/19 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

The doping dependence of the ratio of the superconducting condensate density to the effective mass, n_s^o/m_ab^*, was studied in detail by muon-spin rotation for Y_0.8Ca_0.2Ba₂(Cu_1\ensuremath-zZn_z)₃O_7\ensuremath-\ensuremathδ and Tl_0.5\ensuremath-yPb_0.5+ySr₂Ca_1\ensuremath-xY_xCu₂O₇. Our data show that n_s^o/m_ab^* exhibits a peak at a unique doping state in the overdoped regime. Its position coincides with the critical doping state, where the normal state pseudogap was reported to appear and to deplete the electronic density of states. This finding implies that the pseudogap primarily arises from a change in the electronic ground state rather than from thermal fluctuations.

Citations

• The pseudogap in high-temperature superconductors: an experimental survey

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