Artículos de revistas
Experimental consequences of quantum critical points at high temperatures
Fecha
2015-11-23Registro en:
Freitas, D. C.; Rodiere, P.; Nuñez, Matias; Garbarino, G.; Sulpice, A.; et al.; Experimental consequences of quantum critical points at high temperatures; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 92; 20; 23-11-2015; 205123/1-8
0163-1829
CONICET Digital
CONICET
Autor
Freitas, D. C.
Rodiere, P.
Nuñez, Matias
Garbarino, G.
Sulpice, A.
Marcus, J.
Gay, F.
Continentino, M. A.
Regueiro Nuñez, Manuel
Resumen
We study the Cr1-xRex phase diagram finding that its phase transition temperature towards an antiferromagnetic order TN follows a quantum [(xc-x)/xc]ψ law, with ψ=1/2, from the quantum critical point (QCP) at xc=0.25 up to TN≈600K. We compare this system to others in order to understand why this elemental material is affected by the QCP up to such unusually high temperatures. We determine a general criterion for the crossover, as a function of an external parameter such as concentration, from the region controlled solely by thermal fluctuations to that where quantum effects become observable. The properties of materials with low coherence lengths will thus be altered far away from the QCP.