Polarization effects induced by a magnetic field in intrinsically granular superconductors

Sergeenkov, S.

doi:10.1134/1.2149071

J. Exp. Theor. Phys.

2005

DOI: 10.1134/1.2149071

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Polarization effects induced by a magnetic field in intrinsically granular superconductors

S. Sergeenkov

Abstract: Based on the previously suggested model of nanoscale dislocations induced Josephson junctions and their arrays, we study the magnetic field induced electric polarization effects in intrinsically granular superconductors. In addition to a new phenomenon of chemomagnetoelectricity, the model predicts also a few other interesting effects, including charge analogues of Meissner paramagnetism (at low fields) and "fishtail" anomaly (at high fields). The conditions under which these effects can be experimentally meas… Show more

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Cited by 2 publications

References 27 publications

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Influence of chemical pressure effects on nonlinear thermal conductivity of intrinsically granular superconductors

Sergeenkov¹

2007

Journal of Applied Physics

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Using a 2D model of capacitively coupled Josephson junction arrays (created by a network of twin boundary dislocations with strain fields acting as an insulating barrier between hole-rich domains in underdoped crystals), we study the influence of chemical pressure (∇µ) on nonlinear (i.e., ∇T -dependent) thermal conductivity (NLTC) of an intrinsically granular superconductor.Quite a substantial enhancement of NLTC is predicted when intrinsic chemoelectric field E µ ∝ ∇µ closely matches the externally produced thermoelectric field E T ∝ ∇T . The estimates of the model parameters suggest a realistic possibility to experimentally monitor this effect in non-stoichiometric high-T C superconductors. background. In particular, it was found that at low levels of hole doping (δ < 0.2), the

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Influence of chemical pressure effects on nonlinear thermal conductivity of intrinsically granular superconductors

Sergeenkov¹

2007

Journal of Applied Physics

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The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Koblischka

Půst

Chang

et al. 2023

Metals

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The experimental data in the literature concerning the Paramagnetic Meissner Effect (PME) or also called Wohlleben effect are reviewed with the emphasis on the PME exhibited by metallic, s-wave superconductors. The PME was observed in field-cool cooling (FC-C) and field-cool warming (FC-W) m(T)-measurements on Al, Nb, Pb, Ta, in compounds such as, e.g., NbSe2, In-Sn, ZrB12, and others, and also in MgB2, the metallic superconductor with the highest transition temperature. Furthermore, samples with different shapes such as crystals, polycrystals, thin films, bi- and multilayers, nanocomposites, nanowires, mesoscopic objects, and porous materials exhibited the PME. The characteristic features of the PME, found mainly in Nb disks, such as the characteristic temperatures T1 and Tp and the apparative details of the various magnetic measurement techniques applied to observe the PME, are discussed. We also show that PME can be observed with the magnetic field applied parallel and perpendicular to the sample surface, that PME can be removed by abrading the sample surface, and that PME can be introduced or enhanced by irradiation processes. The PME can be observed as well in magnetization loops (MHLs, m(H)) in a narrow temperature window Tp<Tc, which enables the construction of a phase diagram for a superconducting sample exhibiting the PME. We found that the Nb disks still exhibit the PME after more than 20 years, and we present the efforts of magnetic imaging techniques (scanning SQUID microscopy, magneto-optics, diamond nitrogen-vacancy (NV)-center magnetometry, and low-energy muon spin spectroscopy, (LE-μSR)). Various attempts to explain PME behavior are discussed in detail. In particular, magnetic measurements of mesoscopic Al disks brought out important details employing the models of a giant vortex state and flux compression. Thus, we consider these approaches and demagnetization effects as the base to understand the formation of the paramagnetic signals in most of the materials investigated. New developments and novel directions for further experimental and theoretical analysis are also outlined.

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Polarization effects induced by a magnetic field in intrinsically granular superconductors

Cited by 2 publications

References 27 publications

Influence of chemical pressure effects on nonlinear thermal conductivity of intrinsically granular superconductors

Influence of chemical pressure effects on nonlinear thermal conductivity of intrinsically granular superconductors

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

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