Artículo
Vortex dynamics in β-FeSe single crystals: Effects of proton irradiation and small inhomogeneous stress
Amigó, María Lourdes
; Haberkorn, Nestor Fabian
; Pérez, Pablo Daniel
; Suárez, S.; Nieva, Gladys Leonor
Fecha de publicación:
17/11/2017
Editorial:
IOP Publishing
Revista:
Superconductor Science And Technology
ISSN:
0953-2048
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We report on the critical current density J c and the vortex dynamics of pristine and 3 MeV proton irradiated (cumulative dose equal to cm-2) β-FeSe single crystals. We also analyze a remarkable dependence of the superconducting critical temperature T c, J c and the flux creep rate S on the sample mounting method. Free-standing crystals present T c = 8.4(1) K, which increases to 10.5(1) K when they are fixed to the sample holder by embedding them with GE-7031 varnish. On the other hand, the irradiation has a marginal effect on T c. The pinning scenario can be ascribed to twin boundaries and random point defects. We find that the main effect of irradiation is to increase the density of random point defects, while the embedding mainly reduces the density of twin boundaries. Pristine and irradiated crystals present two outstanding features in the temperature dependence of the flux creep rate: presents large values at low temperatures, which can be attributed to small pinning energies, and a plateau at intermediate temperatures, which can be associated with glassy relaxation. From Maley analysis, we observe that the characteristic glassy exponent μ changes from ∼1.7 to 1.35-1.4 after proton irradiation.
Palabras clave:
Fese
,
Iron-Based Superconductors
,
Irradiation
,
Vortex Dynamics
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Identificadores
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Amigó, María Lourdes; Haberkorn, Nestor Fabian; Pérez, Pablo Daniel; Suárez, S.; Nieva, Gladys Leonor; Vortex dynamics in β-FeSe single crystals: Effects of proton irradiation and small inhomogeneous stress; IOP Publishing; Superconductor Science And Technology; 30; 12; 17-11-2017; 1-8; 125017
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