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Journal Articles

Charge-induced vortex lattice instability

Mounce, A. M.*; Oh, S.*; Mukhopadhyay, S.*; Halperin, W. P.*; Reyes, A. P.*; Kuhns, P. L.*; Fujita, Kazuhiro*; Ishikado, Motoyuki; Uchida, Shinichi*

Nature Physics, 7(2), p.125 - 128, 2011/02

 Times Cited Count:7 Percentile:47.47(Physics, Multidisciplinary)

It has been predicted that superconducting vortices should be electrically charged and that this effect is particularly enhanced for high-temperature superconductors. Hall effect and nuclear magnetic resonance (NMR) experiments suggest the existence of charge accumulation in the vortex core, but the effects are small and the interpretation controversial. Here we show that the Abrikosov vortex lattice, characteristic of the mixed state of superconductors, will become unstable at a sufficiently high magnetic field if there is charge trapped on the vortex core. Our NMR measurements of the magnetic fields generated by vortices in Bi$$_{2}$$Sr$$_{2}$$CaCu$$_{2}$$O$$_{8+y}$$ single crystals provide evidence for an electrostatically driven vortex lattice reconstruction with the magnitude of charge on each vortex pancake of $$sim2 times 10^{-3}e$$, depending on doping, in line with theoretical estimates.

Journal Articles

Spin-density wave near the vortex cores in the high-temperature superconductor Bi$$_{2}$$Sr$$_{2}$$CaCu$$_{2}$$O$$_{8+y}$$

Mounce, A. M.*; Oh, S.*; Mukhopadhyay, S.*; Halperin, W. P.*; Reyes, A. P.*; Kuhns, P. L.*; Fujita, Kazuhiro*; Ishikado, Motoyuki; Uchida, Shinichi*

Physical Review Letters, 106(5), p.057003_1 - 057003_4, 2011/02

 Times Cited Count:8 Percentile:50.98(Physics, Multidisciplinary)

Competition with magnetism is at the heart of high-temperature superconductivity, most intensely felt near a vortex core. To investigate vortex magnetism we have developed a spatially resolved probe based upon NMR spin-lattice-relaxation spectroscopy. With this approach we have found a spin-density wave associated with the vortex core in Bi$$_{2}$$Sr$$_{2}$$CaCu$$_{2}$$O$$_{8+y}$$, similar to checkerboard patterns in the local density of electronic states reported from scanning tunneling microscope experiments. We have determined both the spin-modulation amplitude and decay length from the vortex core in fields up to $$H$$ = 30 T.

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