TY - JOUR
T1 - Effect of Mo/W disorder on the Curie temperature of Sr2FeMo xW1-xO6 double perovskite
AU - Aguilar, B.
AU - Navarro, O.
AU - Carvajal, E.
AU - Avignon, M.
PY - 2007/12
Y1 - 2007/12
N2 - The double perovskites Sr2FeMO6 have received a lot of attention, especially Sr2FeMoO6 because of its fairly high Curie temperature (TC = 450 K), half-metallic character, large magnetoresistance and potential applications. On the other hand, Sr 2FeWO6 is insulating and antiferromagnetic with T N = 37 K. With a double exchange type model it has been shown that a ferromagnetic-antiferromagnetic transition can be driven by super-exchange interactions with increasing Fe-M (M=Mo,W) charge transfer energy. Therefore, the charge transfer energy is expected to be larger in FeW than in FeMo compounds. The effect of the Mo/W diagonal disorder in Sr2FeMo xW1-xO6 has been studied using the tight-binding model and the renormalization perturbation expansion method. For different values of the disorder we calculate the density of states and determine the behavior of the Curie temperature as a function of the Mo/W concentration. The magnetic and the electronic properties in these compounds are discussed in view of these results.
AB - The double perovskites Sr2FeMO6 have received a lot of attention, especially Sr2FeMoO6 because of its fairly high Curie temperature (TC = 450 K), half-metallic character, large magnetoresistance and potential applications. On the other hand, Sr 2FeWO6 is insulating and antiferromagnetic with T N = 37 K. With a double exchange type model it has been shown that a ferromagnetic-antiferromagnetic transition can be driven by super-exchange interactions with increasing Fe-M (M=Mo,W) charge transfer energy. Therefore, the charge transfer energy is expected to be larger in FeW than in FeMo compounds. The effect of the Mo/W diagonal disorder in Sr2FeMo xW1-xO6 has been studied using the tight-binding model and the renormalization perturbation expansion method. For different values of the disorder we calculate the density of states and determine the behavior of the Curie temperature as a function of the Mo/W concentration. The magnetic and the electronic properties in these compounds are discussed in view of these results.
KW - Colossal magnetoresistance
KW - General theory and models of magnetic ordering
KW - Metal-insulator transitions
UR - http://www.scopus.com/inward/record.url?scp=41149128192&partnerID=8YFLogxK
M3 - Artículo
AN - SCOPUS:41149128192
SN - 0035-001X
VL - 53
SP - 146
EP - 149
JO - Revista Mexicana de Fisica
JF - Revista Mexicana de Fisica
IS - 7
ER -