Artículo
Critical exponents and scaling invariance in the absence of a critical point
Fecha de publicación:
12/2016
Editorial:
Springer
Revista:
Nature Communications
ISSN:
2041-1723
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The paramagnetic-to-ferromagnetic phase transition is classified as a critical phenomenon due to the power-law behaviour shown by thermodynamic observables when the Curie point is approached. Here we report the observation of such a behaviour over extraordinarily many decades of suitable scaling variables in ultrathin Fe films, for certain ranges of temperature T and applied field B. This despite the fact that the underlying critical point is practically unreachable because protected by a phase with a modulated domain structure, induced by the dipole-dipole interaction. The modulated structure has a well-defined spatial period and is realized in a portion of the (T, B) plane that extends above the putative critical temperature, where thermodynamic quantities do not display any singularity. Our results imply that scaling behaviour of macroscopic observables is compatible with an avoided critical point.
Palabras clave:
SCALING
,
CRITICAL
,
DIPOLAR INTERACTIONS
,
ULTRATHIN MAGNETIC FILMS
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Licencia
Identificadores
Colecciones
Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Saratz, N.; Zanin, D. A.; Ramsperger, U.; Cannas, Sergio Alejandro; Pescia, D.; et al.; Critical exponents and scaling invariance in the absence of a critical point; Springer; Nature Communications; 7; 12-2016; 1-14
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