Expansion of Vortex Cores by Strong Electronic Correlation in La${}_{2-x}$Sr${}_x$CuO${}_4$ at Low Magnetic Induction

Abstract

The vortex core radius \rv, defined as the peak position of the supercurrent around the vortex, has been determined by muon spin rotation measurements in the mixed state of \lscox for $x=0.13$, 0.15, and 0.19. At lower doping (x=0.13 and 0.15), \rv(T) increases with decreasing temperature T, which is opposite to the behavior predicted by the conventional theory. Moreover, \rv(T\to0) is significantly larger than the Ginsburg-Landau coherence length determined by the upper critical field, and shows a clear tendency to decrease with increasing the doping x. These features can be qualitatively reproduced in a microscopic model involving antiferromagnetic electronic correlations.

arXiv comment6 pages, 4 figures, to be published in Phys. Rev. B

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Cited by in corpus (11)

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• Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors
• Frequency-dependent Thermal Response of the Charge System and Restricted Sum Rules in La(2-x)Sr(x)CuO(4)
• Muon Spin Relaxation Studies of Magnetic-Field-Induced Effects in High-$T_c$ Superconductors
• Hole doping dependences of the magnetic penetration depth and vortex core size in YBa2Cu3Oy: Evidence for stripe correlations near 1/8 hole doping
• Role of CuO chains in vortex core structure in YBa2Cu3O{7-delta}
• Impurity Effect on Kramer-Pesch Core Shrinkage in s-Wave Vortex and Chiral p-Wave Vortex
• An extended infrared study of the (p,T) phase diagram of the p-doped Cu-O plane
• Field-Induced Uniform Antiferromagnetic Order Associated with Superconductivity in Pr${}_{1-x}$LaCe${}_x$CuO${}_{4-\delta }$
• Study of the mixed state of La_{1.83}Sr_{0.17}CuO_{4} by means of muon-spin rotation and magnetization experiments in a low magnetic field
• Antiferromagnetic order and dielectric gap within the vortex core of antiferromagnetic superconductor