Magnetostriktion in Supraleitern

Crystal-Lattice Coupling to the Vortex-Melting Transition inYBa2Cu3OLortz1, Meingast2, Welp3 et al. 2003Phys. Rev. Lett.112100View full textAdd to dashboardCite

“…The peak in the thermal expansion is somewhat broader than in the specific heat due to the averaging procedure. We note that vortices can couple to the crystal lattice through pinning forces, which can result in quite large irreversible magnetostrictive effects [17]; this can, however, be ruled out here because of the reversible nature of the present crystal, which allows the following thermodynamic treatment of our data. The transition of the superconductor at T m will in general depend on pressure, p, and on magnetic field, H, and the following Clausius-Clapeyron equations:…”

“…In this scenario the crystal lattice serves merely as a host for the interacting vortices, and models based on the Lindemann criterion [14] in which the lattice will melt if the thermal displacements of the particles (vortices) reach a certain fraction of the lattice constant have been successful in explaining the observed results [2,15,16]. This could be expected since in clean, lowpinning YBa 2 Cu 3 O 7ÿ and Bi 2 Sr 2 CaCu 2 O 8 crystals the dominant coupling between vortices and the crystal lattice, namely, pinning [17], is absent.In this Letter we show that distinct discontinuities in the thermal expansion of the crystal lattice occur at the vortex-lattice melting transition of YBa 2 Cu 3 O 7ÿ , which demonstrates that the crystal lattice is more than just a host for the vortices. These discontinuities are positive (negative) along the b axis (a axis) and track closely those observed at the zero field T c [18][19][20].…”

“…In this scenario the crystal lattice serves merely as a host for the interacting vortices, and models based on the Lindemann criterion [14] in which the lattice will melt if the thermal displacements of the particles (vortices) reach a certain fraction of the lattice constant have been successful in explaining the observed results [2,15,16]. This could be expected since in clean, lowpinning YBa 2 Cu 3 O 7ÿ and Bi 2 Sr 2 CaCu 2 O 8 crystals the dominant coupling between vortices and the crystal lattice, namely, pinning [17], is absent.…”

Suprastriction in Superconductors

“…In order to reveal the similarities of Aa, with that of the free enthalpy of ferromagnetic materials we insert in (11) the expression for h as given by (6). The last term of (11) then gives…”

Giant Magnetostriction Jumps in Conventional NbTi Superconductor

“…Magnetostriction of several conventional superconductors was, for the first time, investigated by Brändli in late sixties of the twentieth century [1]. However, the investigated conventional superconductors were characterized by high purity and also by low critical current density.…”