Journal of Superconductivity and Novel Magnetism

, Volume 30, Issue 4, pp 1103–1108 | Cite as

From an Anomalous Peak Effect to a Second Magnetization Peak in Nb-rich Nb-Ti Alloys

  • A. M. Ionescu
  • I. Ivan
  • M. Enculescu
  • M. Grigoroscuta
  • D. Miu
  • M. Valeanu
  • P. Badica
  • L. Miu
Original Paper
  • 115 Downloads

Abstract

We investigated the evolution of the DC magnetic hysteresis curves of Nb 0.89Ti 0.11 alloys thermo-mechanically processed by intermediate heat treatments at 900 C in vacuum and cold rolling (∼ 50 % thickness reduction). Starting with a rectangular piece (∼ 0.4 mm thick) cut from the as-grown alloy, after the first thermo-mechanical treatment, the specimen exhibits over a wide temperature T interval a peak effect not far from the DC irreversibility line. With a supplemental thermo-mechanical treatment, the peak effect disappears and is substituted by a second magnetization peak (where the characteristic fields are significantly lower) induced by pinning enhancement. The second magnetization peak was clearly seen at high temperatures only, due to the occurrence of thermo-magnetic instabilities in the low-T domain. In both cases, analysis of magnetic relaxation evidences a crossover towards plastic vortex creep accompanying the maximum in the effective critical current density. These results suggest a common nature of the observed effects, related to the disordering of the vortex system induced by pinning.

Keywords

Nb-rich Nb-Ti alloys DC magnetic measurements Peak effect Second magnetization peak Pinning-induced vortex system disordering 

Notes

Acknowledgments

Work supported by UEFISCDI, Romania, under Core Programs PN16-480101 and PN16-470104.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.National Institute of Materials PhysicsBucharest-MagureleRomania
  2. 2.Faculty of PhysicsUniversity of BucharestBucharest-MagureleRomania
  3. 3.National Institute of Laser, Plasma, and Radiation PhysicsBucharest-MagureleRomania

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