Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2: Interplay between plastic and elastic energy barriers

 

Autores
Marziali Bermudez, Mariano; Louden, E. R.; Eskildsen, M. R.; Dewhurst, C. D.; Bekeris, Victoria Isabel; Pasquini, Gabriela
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2017
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
We studied thermal and dynamic history effects in the vortex lattice (VL) near the order-disorder transition in clean NbSe2 single crystals. Comparing the evolution of the effective vortex pinning and the bulk VL structure, we observed metastable superheated and supercooled VL configurations that coexist with a hysteretic effective pinning response due to thermal cycling of the system. A novel scenario, governed by the interplay between (lower) elastic and (higher) plastic energy barriers, is proposed as an explanation for our observations: Plastic barriers, which prevent the annihilation or creation of topological defects, require dynamic assistance to be overcome and to achieve a stable VL at each temperature. Conversely, thermal hysteresis in the pining response is ascribed to low energy barriers, which inhibit rearrangement within a single VL correlation volume and are easily overcome as the relative strength of competing interactions changes with temperature.
Idioma
inglés
OAI Identifier
oai:ri.conicet.gov.ar:11336/51995
Enlace del recurso
http://hdl.handle.net/11336/51995
Nivel de acceso
Acceso abierto
Materia
VORTEX PHASES
NEUTRON SCATTERING
ORDER-DISORDER TRANSFORMATIONS
METASTABLE PHASES
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS