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- W2738053574 endingPage "184" @default.
- W2738053574 startingPage "159" @default.
- W2738053574 abstract "The occurrence of a second magnetization peakSecond magnetization peak (SMP) on the dc magnetic hysteresis curvesDc magnetic hysteresis curves of superconducting single crystals with randomly distributed vortex pinningVortex pinning centers is quite common. However, the origin of this effect is still under debate. The investigation of the SMP in “self-nanostructured” (striped) La2 Sr CuO4 single crystalsLa2 xSrxCuO4 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)Bragg vortex glass in the presence of static stripe orderStatic stripe order (as revealed using small-angle neutron scattering experiments), which is confirmed by the determined temperature variation of the normalized vortex-creep activation energyNormalized 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 creepVortex creep –plastic creepPlastic 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)Irreversibility line or to a first-order vortex-lattice melting should appear on the dc magnetization curves or in the ac magnetic responseAc magnetic response . This leads to a simple vortex phase diagram for the investigated system." @default.
- W2738053574 created "2017-07-31" @default.
- W2738053574 creator A5002558760 @default.
- W2738053574 creator A5035138443 @default.
- W2738053574 creator A5035870107 @default.
- W2738053574 creator A5061547892 @default.
- W2738053574 creator A5086418653 @default.
- W2738053574 date "2017-01-01" @default.
- W2738053574 modified "2023-09-23" @default.
- W2738053574 title "Behavior of the Second Magnetization Peak in Self-nanostructured La2–x Sr x CuO4 Single Crystals" @default.
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