Vortex dynamics and phase diagram in the electron-doped cuprate superconductor Pr0.87LaCe0.13CuO4
S. Salem-Sugui, Jr., P. V. Lopes, M. P. Kern, Shyam Sundar, Zhaoyu Liu, Shiliang Li, Huiqian Luo, L. Ghivelder
DOI 10.1103/PhysRevB.102.064509 · Physical Review B
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Abstract
Second magnetization peak (SMP) in hole-doped cuprates and iron pnictide superconductors has been widely explored. However, similar feature in the family of electron-doped cuprates is not common. Here, we report the vortex dynamics study in the single crystal of an electron-doped cuprate Pr0.87LaCe0.13CuO4 superconductor using dc magnetization measurements. A second magnetization peak feature in the isothermal M(H) was observed for H∥ab planes. On the other hand, no such feature was observed for the H∥c axis in the crystal. Using magnetic relaxation data, a detailed analysis of activation pinning energy via collective creep theory suggests an elastic to plastic creep crossover across the SMP. Moreover, for the H∥ab, a peak in the temperature dependence of critical current density is also observed near 7 K, which is likely be related to a dimensional crossover [three-dimensional–two dimensional (3D-2D)] associated with the emergence of Josephson vortices at low temperatures. The anisotropy parameter obtained γ≈8–11 indicates the 3D nature of vortex lattice mainly for the H∥c axis. The H−T phase diagrams for H∥c and H∥ab are presented.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr0.87LaCe0.13CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | onset |
| Pr0.88LaCe0.12CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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