Abstract
Transverse and longitudinal magnetostrictions of a disk-shape crystalline conventional V3Si superconductor were studied by the strain gauge technique in an external magnetic field up to 12 T. It has been found that the observed magnetostriction consists of two components. The first component reveals a strong irreversibility correlated with the pinning phenomenon. The second component saturates when the external magnetic field reaches the value of the second critical field Hc2 corresponding to the changes in the free enthalpy of the superconductor in the external magnetic field. One has also observed the phenomena of the thermomagnetic avalanches, which manifest themselves as the jumps of the surface self-field of the investigated sample as well as the jumps of the magnetostriction.
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