Behavior of the Second Magnetization Peak in Self-nanostructured La2–xSrxCuO4 Single Crystals

  • Lucica Miu
  • Alina M. Ionescu
  • Dana Miu
  • Ion Ivan
  • Adrian Crisan
Chapter
First Online:
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 261)

Abstract

The occurrence of a second magnetization peak (SMP) on the dc magnetic hysteresis curves of superconducting single crystals with randomly distributed vortex pinning centers is quite common. However, the origin of this effect is still under debate. The investigation of the SMP in “self-nanostructured” (striped) La2x Sr x CuO4 single crystals can offer useful information about its nature. Optimally doped and overdoped specimens (x ≥ 0.15) exhibit an SMP in a large temperature interval. By decreasing x, with the external magnetic field oriented along the crystallographic c-axis, the SMP completely disappears in the doping domain of well-developed static charge and spin stripes (x ~ 1/8) and reappears for x ≤ 0.10. This behavior follows the instability of the quasi-ordered vortex solid (the Bragg vortex glass) in the presence of static stripe order (as revealed using small-angle neutron scattering experiments), which is confirmed by the determined temperature variation of the normalized vortex-creep activation energy . If the applied field is parallel to the (a, b) planes, the SMP occurs even for specimens with static stripes, accompanied by an elastic vortex creep –plastic creep crossover. The results support the scenario in which the SMP is generated by the pinning-induced disordering of the Bragg vortex glass in the dynamic conditions of dc magnetic measurements. According to this model, for a specimen without macroscopic inhomogeneities in the pinning distribution and exhibiting an SMP, no features related to an anomalous peak effect (close to the irreversibility line) or to a first-order vortex-lattice melting should appear on the dc magnetization curves or in the ac magnetic response . This leads to a simple vortex phase diagram for the investigated system.

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Notes

Acknowledgements

This work has been supported by the POC Project P_37_697 (28/01.09.2016). The kind assistance of the Alexander von Humboldt Foundation is gratefully acknowledged. Thanks are due to T. Adachi, K. Omori, Y. Koike, and J. Mosqueira, providing us with the single crystal specimens.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Lucica Miu
    • 1
  • Alina M. Ionescu
    • 1
    • 2
  • Dana Miu
    • 3
  • Ion Ivan
    • 1
  • Adrian Crisan
    • 1
  1. 1.National Institute of Materials PhysicsBucharest, MagureleRomania
  2. 2.Faculty of PhysicsUniversity of BucharestBucharestRomania
  3. 3.National Institute of Laser, Plasma, and Radiation PhysicsBucharest, MagureleRomania

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