Effect of fluctuations on the NMR relaxation beyond the Abrikosov vortex state

Glatz, A.; Galda, A.; Varlamov, A. A.

doi:10.1103/PhysRevB.92.054513

Title: Effect of fluctuations on the NMR relaxation beyond the Abrikosov vortex state

Journal Article · Tue Aug 25 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.054513· OSTI ID:1356371

Glatz, A. ^[1]; Galda, A. ^[2]; Varlamov, A. A. ^[3]

Argonne National Lab. (ANL), Argonne, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); CNR-SPIN, Rome (Italy)

Here, the effect of fluctuations on the nuclear magnetic resonance (NMR) relaxation rate W = T^–1₁ is studied in a complete phase diagram of a two-dimensional superconductor above the upper critical field line H_c2(T). In the region of relatively high temperatures and low magnetic fields, the relaxation rate W is determined by two competing effects. The first one is its decrease in the result of suppression of the quasiparticle density of states (DOS) due to formation of fluctuation Cooper pairs (FCPs). The second one is a specific, purely quantum relaxation process of the Maki-Thompson (MT) type, which for low field leads to an increase of the relaxation rate. The latter describes particular fluctuation processes involving self-pairing of a single electron on self-intersecting trajectories of a size up to phase-breaking length ℓ_Φ which becomes possible due to an electron spin-flip scattering event at a nucleus. As a result, different scenarios with either growth or decrease of the NMR relaxation rate are possible upon approaching the normal-metal–type-II superconductor transition. The character of fluctuations changes along the line H_c2(T) from the thermal long-wavelength type in weak magnetic fields to the clusters of rotating FCPs in fields comparable to Hc2(0). We find that below the well-defined temperature T*₀ ≈ 0.6T_c0, the MT process becomes ineffective even in the absence of intrinsic pair breaking. The small scale of the FCP rotations ξ_xy in such high fields impedes formation of long (≲ℓ_Φ) self-intersecting trajectories, causing the corresponding relaxation mechanism to lose its efficiency. This reduces the effect of superconducting fluctuations in the domain of high fields and low temperatures to just the suppression of quasiparticle DOS, analogous to the Abrikosov vortex phase below the H_c2(T) line.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1356371

Alternate ID(s):: OSTI ID: 1212956

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 5; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Fluctuation spectroscopy: From Rayleigh-Jeans waves to Abrikosov vortex clusters Varlamov, A. A.; Galda, A.; Glatz, A. Reviews of Modern Physics, Vol. 90, Issue 1 https://doi.org/10.1103/revmodphys.90.015009	journal	March 2018

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