Vortex Lattice Melting and Hc2 in underdoped YBa2Cu3Oy

Abstract

Vortices in a type-II superconductor form a lattice structure that melts when the thermal displacement of the vortices is an appreciable fraction of the distance between vortices. In an anisotropic high-Tc superconductor, such as YBa2Cu3Oy, the magnetic field value where this melting occurs can be much lower than the mean-field critical field Hc2. We examine this melting transition in YBa2Cu3Oy with oxygen content y from 6.45 to 6.92, and fit the data to a theory of vortex-lattice melting. The quality of the fits indicates that the transition to a resistive state is indeed the vortex lattice melting transition, with the shape of the melting curves being consistent with the known change in penetration depth anisotropy from underdoped to optimally doped YBa2Cu3Oy. From the fits we extract Hc2(T = 0) as a function of hole doping. The unusual doping dependence of Hc2(T =0) points to some form of electronic order competing with superconductivity around 0.12 hole doping.

arXiv comment6 pages, 8 figures

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• Pair Density Waves in Superconducting Vortex Halos
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• Probing the phase diagram of cuprates with YBa${}_2$Cu${}_3$O${}_{7-\delta }$ thin films and nanowires
• Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field
• Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3Oy
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• Spatially Inhomogeneous Competition between Superconductivity and the Charge Density Wave in YBa${}_2$Cu${}_3$O${}_{6.67}$
• Extent of Fermi-surface reconstruction in the high-temperature superconductor HgBa${}_2$CuO${}_{4+\delta }$
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• Low anisotropy of the upper critical field in a strongly anisotropic layered cuprate: Evidence for paramagnetically limited superconductivity
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• Observation of electronic bound states in charge-ordered YBa${}_2$Cu${}_3$O${}_y$
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• Enigma of the vortex state in a strongly correlated d-wave superconductor
• Hall anomaly and vortex charge in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_x$
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• Doping dependence of the upper critical field in untwinned YBa${}_2$Cu${}_3$O${}_{7-\delta }$ thin films
• Influence of the Fermi Surface Morphology on the Magnetic Field-Driven Vortex Lattice Structure Transitions in YBa${}_2$Cu${}_3$O${}_{7-\delta }:\delta =$0, 0.15
• Doping Dependence of Upper Critical Field of High-Tc Cuprate Bi2+xSr2-xCaCu2O8+d Estimated from Irreversibility Field at Zero Temperature
• Doping-dependent critical Cooper-pair momentum in thin, underdoped cuprate films
• Boosting superconductivity in ultrathin YBa${}_2$Cu${}_3$O${}_{7-\delta }$ films via nanofaceted substrates
• Precursor superconducting diamagnetism in YBa2Cu3O7-d with in-plane or intercalated magnetic impurities
• Thermodynamic signature of a magnetic-field-driven phase transition within the superconducting state of an underdoped high-temperature superconductor