Charged Vortices in High Temperature Superconductors Probed by NMR

Abstract

We report a first experimental evidence that a vortex in the high temperature superconductors (HTSC) traps a finite electric charge from the high resolution measurements of the nuclear quadrupole frequencies. In slightly overdoped YBa_2Cu_3O_7 the vortex is negatively charged by trapping electrons, while in underdoped YBa_2Cu_4O_8 it is positively charged by expelling electrons. The sign of the trapped charge is opposite to the sign predicted by the conventional BCS theory. Moreover, in both materials, the deviation of the magnitude of the charge from the theory is also significant. These unexpected features can be attributed to the novel electronic structure of the vortex in HTSC.

6 pages, 7 figures, to be published in Phys Rev. B

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Cited by in corpus (30)

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• Vortex Charges in High Temperature Superconductors
• Vortex Charging Effect in a Chiral $p_x\pm i{p}_y$-Wave Superconductor
• Vortex structure in chiral p-wave superconductors
• Electrostatic potential in a superconductor
• Vortex structure in d-density wave scenario of pseudogap
• Antiferromagnetism and charged vortices in high-Tc superconductors
• Vortex charge in mesoscopic superconductors
• NMR evidence for Friedel-like oscillations in the CuO chains of ortho-II YBa${}_2$Cu${}_3$O${}_{6.5}$
• Bernoulli potential at a superconductor surface
• Shifts of the nuclear resonance in the vortex lattice in YBa${}_2$Cu${}_3$O${}_7$
• Superconducting vortex-charge measurement using cavity electromechanics
• Charge Dynamics of Vortex Cores in Layered Chiral Triplet Superconductors
• Vortex-Core Charging Due to the Lorentz Force in a $d$-Wave Superconductor
• Hall Effect in the Abrikosov Lattice of Type-II Superconductors
• Bernoulli potential in type-I and weak type-II supercoductors: II. Surface dipole
• Effects of disorder on the vortex charge
• Temperature dependence of Vortex Charges in High Temperature Superconductors
• Hall anomaly and moving vortex charge in layered superconductors
• Theory of the supercyclotron resonance and Hall response in anomalous 2d metals
• Charge Induced Vortex Lattice Instability
• Charging in a Superconducting Vortex Due to the Three Force Terms in Augmented Eilenberger Equations
• Electric field in stationary superconductors
• Temperature Dependence of the Cu(2) NQR Line Width in YBa${}_2$Cu${}_3$O${}_{7-y}$
• Helical instability of charged vortices in layered superconductors
• Interaction between ionic lattices and superconducting condensates
• Bernoulli Potential, Hall Constant and Cooper Pairs Effective Masses in Disordered BCS Superconductors
• The concept of correlated density and its application
• Zeeman Perturbed ${}^{63}$Cu Nuclear Quadrupole Resonance Study of the Vortex State of YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Charging in the vortex lattice of type-II superconductors