Expansion of the Vortex Cores in YBa2Cu3O6.95 at Low Magnetic Fields

Abstract

Muon spin rotation spectroscopy has been used to measure the effective size of the vortex cores in optimally doped YBa2Cu3O6.95 as a function of temperature and magnetic field deep in the superconducting state. While the core size at H=2T is close to 20 angstroms and consistent with that measured by STM at 6T, we find a striking increase in the core size at lower magnetic fields, where it approaches an extraordinarily large value of about 100 angstroms. This suggests that the average value of the superconducting coherence length in cuprate superconductors may be larger than previously thought at low magnetic fields.

9 pages, 4 figures, 1 text file

References in corpus (6)

• Self-consistent electronic structure of a $d_{x^2-y^2}$ and a $d_{x^2-y^2}+i{d}_{xy}$ vortex
• Low-lying Quasiparticle Excitations around a Vortex Core in Quantum Limit
• Muon-Spin Rotation Measurements of the Magnetic Field Dependence of the Vortex-Core Radius and Magnetic Penetration Depth in NbSe2
• Muon spin rotation measurement of the fundamental length scales in the vortex state of YBa2Cu3O6.60
• Low Temperature Behavior of the Vortex Lattice in Unconventional Superconductors
• Quasiparticle transport in the vortex state of d-wave superconductors

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• Hole doping dependences of the magnetic penetration depth and vortex core size in YBa2Cu3Oy: Evidence for stripe correlations near 1/8 hole doping
• Shrinking Magnetic Vortices in V3Si Due to Delocalized Quasiparticle Core States: Confirmation of the Microscopic Theory for Interacting Vortices
• Strongly Anisotropic s-Wave Gaps in Exotic Superconductors
• Fractal geometry of normal phase clusters and magnetic flux trapping in high-Tc superconductors
• Role of CuO chains in vortex core structure in YBa2Cu3O{7-delta}
• Expansion of Vortex Cores by Strong Electronic Correlation in La${}_{2-x}$Sr${}_x$CuO${}_4$ at Low Magnetic Induction
• Dynamics of the magnetic flux trapped in fractal clusters of normal phase in a superconductor
• Electric field induced by magnetic flux motion in superconductor containing fractal clusters of a normal phase
• Resistive state of superconducting structures with fractal clusters of a normal phase
• Signatures of New $d$-Wave Vortex Physics in Overdoped Tl${}_2$Ba${}_2$CuO${}_{6+x}$ Revealed by TF-${\mu }^{+}$SR
• Vortex lattice stability in the SO(5) model
• Vortex Dynamics in Percolative Superconductors Containing Fractal Clusters of a Normal Phase
• Terahertz Hall Measurements On Optimally Doped Single Crystal Bi-2212
• Critical currents and vortex dynamics in percolative superconductors containing fractal clusters of a normal phase
• Doping-dependent critical Cooper-pair momentum in thin, underdoped cuprate films
• Depinning at the initial stage of the resistive transition in superconductors with a fractal cluster structure
• Vortex Dynamics at the Initial Stage of Resistive Transition in Superconductors with Fractal Cluster Structure