Singlet-bond superconductivity theory of the phase diagrams of cuprate high-temperature superconductor

Hiroyuki Kaga ()
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Hiroyuki Kaga: Niigata University

The European Physical Journal B: Condensed Matter and Complex Systems, 2025, vol. 98, issue 9, 1-20

Abstract: Abstract This paper shows that the singlet-bond (SB) superconductivity theory can explain the phase diagram of cuprate high-temperature superconductor and presents the Ginzburg-Landau (GL) free energy formulation of the SB theory together with the London penetration depth $$\lambda $$ λ and the GL coherence length $$\xi $$ ξ . The experimental temperature-doping $$T-\delta $$ T - δ phase diagrams covering the underdoped and overdoped regimes are shown to result from various physical phenomena in the SB superconductivity theory. There is the monotonically increasing doping-dependent coherence onset temperature $$T_{coh}$$ T coh between the superconducting transition temperature $$T_{c}$$ T c and the monotonically decreasing pseudogap onset temperature $$T^{*}$$ T ∗ , ( $$T_{c}

Date: 2025
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DOI: 10.1140/epjb/s10051-025-01036-8

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