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      Inverse correlation between quasiparticle mass and Tc in a cuprate high-Tc superconductor

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          Abstract

          Close to a zero temperature transition between ordered and disordered electronic phases, quantum fluctuations can lead to a strong enhancement of the electron mass and to the emergence of competing phases such as superconductivity. A correlation between the existence of such a quantum phase transition and superconductivity is quite well established in some heavy fermion and iron-based superconductors and there have been suggestions that high temperature superconductivity in the copper oxide materials (cuprates) may also be driven by the same mechanism. Close to optimal doping, where the superconducting transition temperature \(T_c\) is maximum in the cuprates, two different phases are known to compete with superconductivity: a poorly understood pseudogap phase and a charge ordered phase. Recent experiments have shown a strong increase in quasiparticle mass \(m^*\) in the cuprate YBa\(_2\)Cu\(_3\)O\(_{7-\delta}\) as optimal doping is approached suggesting that quantum fluctuations of the charge ordered phase may be responsible for the high-\(T_c\) superconductivity. We have tested the robustness of this correlation between \(m^*\) and \(T_c\) by performing quantum oscillation studies on the stoichiometric compound YBa\(_2\)Cu\(_4\)O\(_8\) under hydrostatic pressure. In contrast to the results for YBa\(_2\)Cu\(_3\)O\(_{7-\delta}\), we find that in YBa\(_2\)Cu\(_4\)O\(_8\) the mass decreases as \(T_c\) increases under pressure. This inverse correlation between \(m^*\) and \(T_c\) suggests that quantum fluctuations of the charge order enhance \(m^*\) but do not enhance \(T_c\).

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          Most cited references42

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          Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor

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            Magnetic-field-induced charge-stripe order in the high-temperature superconductor YBa2Cu3Oy

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              Electron pockets in the Fermi surface of hole-doped high-Tc superconductors

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                Author and article information

                Journal
                2016-03-29
                Article
                10.1126/sciadv.1501657
                1603.08897
                5f1a8417-32e7-4b72-b823-60b094e97ac8

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                Science Advances 2, e1501657 (2016)
                11 pages includes supplementary information
                cond-mat.supr-con

                Condensed matter
                Condensed matter

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