Peak effect in the magnetostriction of superconducting NbTi due to elastic constants

U. Wyder, P. J.E.M. van der Linden, H. P. van der Meulen, A. Gerber, V. H.M. Duyn, J. A.A.J. Perenboom, A. de Visser, J. J.M. Franse

Research output: Contribution to journalArticlepeer-review

Abstract

The magnetostriction on polycrystalline superconducting NbTi perpendicular to the field is measured to study lattice deformation effects caused by fluxoids exerting forces on the lattice through pinning centers. A "dip" for increasing and a "peak" for decreasing fields in its length at 80% of the upper critical field (Bcs2 = 12 T) was observed. Its temperature dependence is well explained by universal Bc2(T) scaling laws for pinning forces and elastic constants. Identical features are observed in the magnetization. In critical current no anomaly is found. An explanation in terms of an anomaly in elastic constants due to a field induced degeneracy of the ground state is discussed.

Original languageEnglish
Pages (from-to)265-268
Number of pages4
JournalPhysica B: Condensed Matter
Volume211
Issue number1-4
DOIs
StatePublished - 1 May 1995
Externally publishedYes

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