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Magnetic Memory Effects in BaFe(AsP) Superconducting Single Crystal.
Materials (Basel)
October 2024
National Institute of Materials Physics, 405A Atomistilor Str., 077125 Magurele, Romania.
Among many iron-based superconductors, isovalently substituted BaFe(AsP) displays, for ≈ 0.3, apart from the quite usual Second Magnetization Peak (SMP) in the field dependence of the critical current density, an unusual peak effect in the temperature dependence of the critical current density in the constant field, which is related to the rhombic-to-square (RST) structural transition of the Bragg vortex glass (BVG). By using multi-harmonic AC susceptibility investigations in three different cooling regimes-field cooling, zero-field cooling, and field cooling with measurements during warming up-we have discovered the existence of a temperature region in which there is a pronounced magnetic memory effect, which we attributed to the direction of the structural transition.
View Article and Find Full Text PDFOrdered Bose Glass of Vortices in Superconducting YBaCuO Thin Films with a Periodic Pin Lattice Created by Focused Helium Ion Irradiation.
Nanomaterials (Basel)
October 2022
Faculty of Physics, University of Vienna, A-1090 Wien, Austria.
The defect-rich morphology of YBaCuO (YBCO) thin films leads to a glass-like arrangement of Abrikosov vortices which causes the resistance to disappear in vanishing current densities. This vortex glass consists of entangled vortex lines and is identified by a characteristic scaling of the voltage-current isotherms. Randomly distributed columnar defects stratify the vortex lines and lead to a Bose glass.
View Article and Find Full Text PDFLow-temperature anomaly in disordered superconductors near as a vortex-glass property.
Nat Phys
January 2019
L. D. Landau Institute for Theoretical Physics, Chernogolovka, 142432, Moscow region, Russia.
Strongly disordered superconductors in a magnetic field display many characteristic properties of type-II superconductivity-except at low temperatures, where an anomalous linear temperature dependence of the resistive critical field is routinely observed. This behavior violates the conventional theory of superconductivity, and its origin has posed a long-standing puzzle. Here we report systematic measurements of the critical magnetic field and current on amorphous indium oxide films with various levels of disorder.
View Article and Find Full Text PDFGlassy Dynamics in a heavy ion irradiated NbSe crystal.
Sci Rep
September 2018
Condensed Matter and Magnet Science, MPA, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
Fascination with glassy states has persisted since Fisher introduced the vortex-glass as a new thermodynamic phase that is a true superconductor that lacks conventional long-range order. Though Fisher's original model considered point disorder, it was later predicted that columnar defects (CDs) could also induce glassiness - specifically, a Bose-glass phase. In YBaCuO (YBCO), glassy states can cause distinct behavior in the temperature (T ) dependent rate of thermally activated vortex motion (S).
View Article and Find Full Text PDFDecomposing the Bragg glass and the peak effect in a Type-II superconductor.
Nat Commun
March 2018
School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
Adding impurities or defects destroys crystalline order. Occasionally, however, extraordinary behaviour emerges that cannot be explained by perturbing the ordered state. One example is the Kondo effect, where magnetic impurities in metals drastically alter the temperature dependence of resistivity.
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