Interplay between Disorder and Quantum and Thermal Fluctuations in Ferromagnetic Alloys: The case ofUCu2Si2−xGex

Autor:	J.S. Kim, Mixson D, Silva Neto Mb, G. R. Stewart, Castro Neto Ah
Rok vydání:	2003
Předmět:	Physics Condensed Matter::Materials Science Residual resistivity Condensed matter physics Ferromagnetism Electrical resistivity and conductivity General Physics and Astronomy Thermal fluctuations Curie temperature Fermi liquid theory Thermal conduction Quantum fluctuation
Zdroj:	Physical Review Letters. 91
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.91.257206
Popis:	We consider, theoretically and experimentally, the effects of structural disorder, quantum fluctuations, and thermal fluctuations in the magnetic and transport properties of certain ferromagnetic alloys. We study the particular case of UCu 2 Si 2 - x Ge x . The low temperature resistivity, ρ(T,x), exhibits Fermi liquid behavior as a function of temperature T for all values of x, which can be interpreted as a result of the magnetic scattering of the conduction electrons from the localized U spins. The residual resistivity, p(0, x), follows the behavior of a disordered binary alloy. The observed nonmonotonic dependence of the Curie temperature, T c (x), with x can be explained within a model of localized spins interacting with an electronic bath. Our results clearly show that the Curie temperature of certain alloys can be enhanced due to the interplay between quantum and thermal fluctuations with disorder.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1be6c6227349f185c8d711e2e7031bd9 https://doi.org/10.1103/physrevlett.91.257206 Zobrazit plný text záznamu