Magnetic properties of the ordered and disordered double perovskite Sr2Fe1+xMo1-xO6 (-1 ≤ x ≤ 1/3)

被引：18

作者：

Suarez, J. R. ^{[1
,2
]}

Estrada, F. ^{[3
,4
]}

Navarro, O. ^{[3
]}

Avignon, M. ^{[1
,2
]}

机构：

[1] CNRS, Inst Neel, F-38042 Grenoble 9, France

[2] Univ Grenoble 1, F-38042 Grenoble 9, France

[3] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico

[4] Ctr Invest Mat Avanzados, Chihuahua Chih 31109, Mexico

来源：

EUROPEAN PHYSICAL JOURNAL B | 2011年 / 84卷 / 01期

关键词：

ELECTRONIC-STRUCTURE; CATIONIC DISORDER; SR2FEMOO6; MAGNETORESISTANCE; TRANSITION; OXIDE;

D O I：

10.1140/epjb/e2011-20647-2

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have studied the effect of cationic disorder on the spin polarization of the double perovskite system Sr2Fe1+x Mo1-x O-6 with -1 a parts per thousand currency sign x a parts per thousand currency sign 1/3. The composition x = 0 corresponds to the well-known double-perovskite Sr2FeMoO6, which is expected to have complete spin polarization, however all samples present some degree of Fe/Mo disorder which reduces the tunneling magnetoresistance in granular samples. We consider an electronic model within the renormalized perturbation expansion Green's functions, consisting in a correlated electron picture with localized Fe-ions and itinerant electrons interacting with the local spins via a double-exchange type mechanism. Our results show the influence of disorder on the density of states and the ground-state properties, particularly on the spin polarization over the whole range of x.

引用

页码：53 / 58

页数：6

共 23 条

[1] Calorimetric investigations of SrMoO3 and BaMoO3 compounds [J].

Agarwal, R ;

Singh, Z ;

Venugopal, V .

JOURNAL OF ALLOYS AND COMPOUNDS, 1999, 282 (1-2) :231-235

[2] Effect of cationic disorder on the spin polarization in FeMo double perovskites [J].

Aguilar, B. ;

Navarro, O. ;

Avicnon, M. .

EPL, 2009, 88 (06)

[3] Tunnel magnetoresistance in nanojunctions based on Sr2FeMoO6 [J].

Bibes, M ;

Bouzehouane, K ;

Barthélémy, A ;

Besse, M ;

Fusil, S ;

Bowen, M ;

Seneor, P ;

Carrey, J ;

Cros, V ;

Vaurès, A ;

Contour, JP ;

Fert, A .

APPLIED PHYSICS LETTERS, 2003, 83 (13) :2629-2631

[4] Ferromagnetic transition in ordered double perovskites and related alloys [J].

Carvajal, E ;

Navarro, O ;

Allub, R ;

Avignon, M ;

Alascio, B .

EUROPEAN PHYSICAL JOURNAL B, 2005, 48 (02) :179-187

[5] Structural phase transition and the electronic and magnetic properties of Sr2FeMoO6 [J].

Chmaissem, O ;

Kruk, R ;

Dabrowski, B ;

Brown, DE ;

Xiong, X ;

Kolesnik, S ;

Jorgensen, JD ;

Kimball, CW .

PHYSICAL REVIEW B, 2000, 62 (21) :14197-14206

[6]

Economou E. N., 2006, GREENS FUNCTIONS QUA

[7] Finding universal correlations between cationic disorder and low field magnetoresistance in FeMo double perovskite series [J].

Garcia-Hernández, M ;

Martínez, JL ;

Martínez-Lope, MJ ;

Casais, MT ;

Alonso, JA .

PHYSICAL REVIEW LETTERS, 2001, 86 (11) :2443-2446

[8] Room-temperature magnetoresistance in an oxide material with an ordered double-perovskite structure [J].

Kobayashi, KL ;

Kimura, T ;

Sawada, H ;

Terakura, K ;

Tokura, Y .

NATURE, 1998, 395 (6703) :677-680

[9] Systematic trends in the electronic structure parameters of the 4d transition-metal oxides SrMO3 (M=Zr, Mo, Ru, and Rh) -: art. no. 113101 [J].

Lee, YS ;

Lee, JS ;

Noh, TW ;

Byun, DY ;

Yoo, KS ;

Yamaura, K ;

Takayama-Muromachi, E .

PHYSICAL REVIEW B, 2003, 67 (11) :4

[10] Evidence for valence fluctuation of Fe in Sr2FeMoO6-w double perovskite [J].

Lindén, J ;

Yamamoto, T ;

Karppinen, M ;

Yamauchi, H ;

Pietari, T .

APPLIED PHYSICS LETTERS, 2000, 76 (20) :2925-2927

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