Magnetostriktion in Supraleitern

Superconducting and magnetic properties of ErRh4B4

“…3 (for a detailed description of this effect, see Ref. 12). In our case we now have the difficulty that as soon as the external field penetrates into the superconductor and a mixed state is formed, the normal regions undergo a very strong magnetostriction, which, even in these low fields, is at least comparable to the contributions expected from the superconducting properties.…”

Flux-pinning-induced stress and magnetostriction in bulk superconductors

“…Nonetheless, advanced models based on thermodynamic arguments were developed and successfully applied in many cases. Excellent summaries of that work can be found elsewhere [2][3][4]. In the present overview the focus is set on effects that are caused by the pinning-induced body force, which by its nature can generate very large and irreversible deformations.…”

“…Trapped surface field, B 0 , of a fully magnetized HTS and a conventional permanent magnet (PM). The graphs illustrate equations (1) and(2).…”

On electrostriction of a granular superconductor

“…In contrast to magnetostriction of a granular superconductor, its electroelastic behavior is predicted to be dominated by the former contribution for all applied fields.Some attention was given recently to rather peculiar electric-field induced phenomena, either observed experimentally (like a substantial critical current enhancement [1-3]) or predicted to occur (like a possibility of magnetoelectric effect due to the Dzyaloshinski-Moria type coupling between an applied electric field and an effective magnetic field of circulating Josephson currents [4]) in granular superconductors and attributed to their weak-link structure. At the same time, as compared to the magnetoelastic behavior of superconducting materials (dominated either by a vortex response [5][6][7][8] or by weak-links structure [9]), their electroelastic behavior still remains to be properly addressed.In the present communication, another interesting pnenomenon related to the modification of the sample's weak-links structure in an applied electric field is discussed. Namely, we consider a possible role of Josephson junctions in low-temperature behavior of the fieldinduced polarization and the related electroelastic properties of granular superconductors.As is well-known [10], the change of the free energy of a superconductor in the presence of an external electric field E readswhere P (E) is the electric polarization of a granular superconductor at zero temperature (see below), V its volume, and the internal field E i is related to the applied field E via an effective dielectric constant ǫ, namely [10] E i = E/ǫ.…”

“…Some attention was given recently to rather peculiar electric-field induced phenomena, either observed experimentally (like a substantial critical current enhancement [1][2][3]) or predicted to occur (like a possibility of magnetoelectric effect due to the Dzyaloshinski-Moria type coupling between an applied electric field and an effective magnetic field of circulating Josephson currents [4]) in granular superconductors and attributed to their weak-link structure. At the same time, as compared to the magnetoelastic behavior of superconducting materials (dominated either by a vortex response [5][6][7][8] or by weak-links structure [9]), their electroelastic behavior still remains to be properly addressed.…”