The average kinetic energy density of Cooper pairs above $T_c$ in $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{7-\mathrm{x}}$, $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$, and $\mathrm{Nb}$

Abstract

We have obtained isofield curves for the square root of the average kinetic energy density of the superconducting state for three single crystals of underdoped $YB{a}_{2}C{u}_3{O}_{7-x}$, an optimally doped single crystal of $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$, and Nb. These curves, determined from isofield magnetization versus temperature measurements and the virial theorem of superconductivity, probe the order parameter amplitude near the upper critical field. The striking differences between the Nb and the high-$T_c$ curves clearly indicate for the latter cases the presence of a unique superconducting condensate below and above $T_c$.

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• Superconducting fluctuations in the reversible magnetization of the iron-pnictide $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Structural and Tc inhomogeneities inherent to doping in La_{2-x}Sr_xCuO_4 superconductors and their effects on the precursor diamagnetism
• Comment on 'Diamagnetism and Cooper pairing above Tc in cuprates'
• The diamagnetism above the superconducting transition in underdoped La(1.9)Sr(0.1)CuO(4) revisited: Chemical disorder or phase incoherent superconductivity?
• Study of diamagnetic fluctuations in YBa_2Cu_3O_{7-x} and Bi_2Sr_2CaCu_2O_{8+x}: Possible observation of phase correlations persisting above T_c
• Fluctuation diamagnetism around the superconducting transition in a cuprate crystal with a reduced Meissner fraction
• The conductivity and the magnetization around Tc in optimally-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ revisited: quantitative analysis in terms of fluctuating superconducting pairs
• Onset of phase correlations in YBa2Cu3O{7-x} as determined from reversible magnetization measurements
• Magnetic measurements and kinetic energy of the superconducting condensate in SmBa_2Cu_3O_{7-δ}
• Effects of the pseudo-gap on the field-induced kinetic energy density of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ single crystals