Hole Doping Dependence of the Coherence Length in $L{a}_{2-x}S{r}_{x}Cu{O}_4$ Thin Films

Abstract

By measuring the field and temperature dependence of magnetization on systematically doped $L{a}_{2-x}S{r}_{x}Cu{O}_4$ thin films, the critical current density $j_c(0)$ and the collective pinning energy $U_p(0)$ are determined in single vortex creep regime. Together with the published data of superfluid density, condensation energy and anisotropy, for the first time we derive the doping dependence of the coherence length or vortex core size in wide doping regime directly from the low temperature data. It is found that the coherence length drops in the underdoped region and increases in the overdoped side with the increase of hole concentration. The result in underdoped region clearly deviates from what expected by the pre-formed pairing model if one simply associates the pseudogap with the upper-critical field.

4 pages, 4 figures

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• Electronic specific heat and low energy quasiparticle excitations in superconducting state of $L{a}_{2-x}S{r}_{x}Cu{O}_4$ single crystals
• Hole doping dependences of the magnetic penetration depth and vortex core size in YBa2Cu3Oy: Evidence for stripe correlations near 1/8 hole doping
• Doping dependence of the upper critical field in La_{2-x}Sr_xCuO_4 from specific heat
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• Enhancement of superconducting transition temperature by the additional second neighbor hopping t' in the t-J model
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• The diamagnetism above the superconducting transition in underdoped La(1.9)Sr(0.1)CuO(4) revisited: Chemical disorder or phase incoherent superconductivity?
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• Test for BCS-BEC Crossover in the Cuprate Superconductors
• Enigma of the vortex state in a strongly correlated d-wave superconductor
• Two Superconducting Transitions in Single Crystal La${}_{2-x}$Ba${}_x$CuO${}_4$
• Vortex-driven periodic and aperiodic magnetoresistance oscillations in cuprates
• Condensation mechanism of high-$T_c$ cuprates: the key role of pairon excitations