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• W2045504112 abstract "An extensive study of the magnetic properties of FeTe$_{0.7}$Se$_{0.3}$ crystals in the superconducting state is presented. We show that weak collective pinning, originating from spatial variations of the charge carrier mean free path ($delta l$ pinning), rules in this superconductor. Our results are compatible with the nanoscale phase separation observed on this compound and indicate that in spite of the chemical inhomogeneity spatial fluctuations of the critical temperature are not important for pinning. A power law dependence of the magnetization vs time, generally interpreted as signature of single vortex creep regime, is observed in magnetic fields up to $8 ~ T$. For magnetic fields applied along the c axis of the crystal the magnetization curves exhibit a clear peak effect whose position shifts when varying the temperature, following the same dependence as observed in YBa$_2$Cu$_3$O$_{7-delta}$. The time and temperature dependence of the peak position has been investigated. We observe that the occurrence of the peak at a given magnetic field determines a specific vortex configuration that is independent on the temperature. This result indicates that the influence of the temperature on the vortex-vortex and vortex-defect interactions leading to the peak effect in FeTe$_{0.7}$Se$_{0.3}$ is negligible in the explored range of temperatures." @default.
• W2045504112 created "2016-06-24" @default.
• W2045504112 creator A5041174498 @default.
• W2045504112 creator A5052950129 @default.
• W2045504112 creator A5060538991 @default.
• W2045504112 creator A5070073295 @default.
• W2045504112 date "2012-04-30" @default.
• W2045504112 modified "2023-10-14" @default.
• W2045504112 title "Temperature and time scaling of the peak-effect vortex configuration in FeTe<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.7</mml:mn></mml:mrow></mml:msub></mml:math>Se<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.3</mml:mn></mml:mrow></mml:msub></mml:math>" @default.
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• W2045504112 doi "https://doi.org/10.1103/physrevb.85.134532" @default.
• W2045504112 hasPublicationYear "2012" @default.
• W2045504112 type Work @default.
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