Time-dependent London approach: Dissipation due to out-of-core normal excitations by moving vortices

Journal Article · 19 March 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.97.094510 · OSTI ID:1433672

Kogan, V. G. ^[1]

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1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics

The dissipative currents due to normal excitations are included in the London description. The resulting time-dependent London equations are solved for a moving vortex and a moving vortex lattice. It is shown that the field distribution of a moving vortex loses its cylindrical symmetry. It experiences contraction that is stronger in the direction of the motion than in the direction normal to the velocity v. The London contribution of normal currents to dissipation is small relative to the Bardeen-Stephen core dissipation at small velocities, but it approaches the latter at high velocities, where this contribution is no longer proportional to v². Here, to minimize the London contribution to dissipation, the vortex lattice is oriented so as to have one of the unit cell vectors along the velocity. This effect is seen in experiments and predicted within the time-dependent Ginzburg-Landau theory.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1433672
• Alternate ID(s): OSTI ID: 1426832
• Report Number(s): IS-J-9634; PRBMDO; TRN: US1802541
• Journal Information: Physical Review B, Vol. 97, Issue 9; ISSN 2469-9950
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English