Crystal structure and magnetic properties of SrCaMnGaO5+δ

被引:36
作者
Battle, PD
Bell, AMT
Blundell, SJ
Coldea, AI
Gallon, DJ
Pratt, FL
Rosseinsky, MJ
Steer, CA
机构
[1] Univ Oxford, Inorgan Chem Lab, Dept Chem, Oxford OX1 3QR, England
[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
[3] Rutherford Appleton Lab, ISIS, Didcot OX11 0QX, Oxon, England
[4] Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England
基金
英国工程与自然科学研究理事会;
关键词
brownmillerite; magnetoresistance;
D O I
10.1006/jssc.2002.9641
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The room-temperature crystal structure of the brownmillerite SrCaMnGaO5+delta (delta = 0.035) has been refined from neutron powder diffraction data; space group Ima2, a = 15.7817(6), b = 5.4925(2), c = 5.3196(2) Angstrom. Mn and Ga occupy 99.0(2)% of the 6- and 4-coordinate sites, respectively. A combination of magnetometry, neutron diffraction and muSR spectroscopy has shown that the compound orders magnetically at 180 K, and that the low-temperature phase has a G-type antiferromagnetic structure, with an ordered magnetic moment of 3.30(2) mu(B) per Mn at 2 K. Displaced hysteresis loops provide evidence that the atomic moment has an additional, glassy component. Magnetometry shows that significant short-range magnetic interactions persist above 180 K, and muSR that the spin fluctuations are thermally activated in this temperature region. The compound is an electrical insulator which at 159 K shows an unusually large magnetoresistance of 85% in 6 T, increasing to 90% in 13 T. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:188 / 195
页数:8
相关论文
共 21 条
[1]   Synthesis, crystal structure, and magnetic properties of a novel layered manganese oxide Sr2MnGaO5+δ [J].
Abakumov, AM ;
Rozova, MG ;
Pavlyuk, BP ;
Lobanov, MV ;
Antipov, EV .
JOURNAL OF SOLID STATE CHEMISTRY, 2001, 160 (02) :353-361
[2]   Synthesis and crystal structure of novel layered manganese oxide Ca2MnGaO5+δ [J].
Abakumov, AM ;
Rozova, MG ;
Pavlyuk, BP ;
Lobanov, MV ;
Antipov, EV ;
Lebedev, OI ;
Van Tendeloo, G ;
Sheptyakov, DV ;
Balagurov, AM ;
Bourée, F .
JOURNAL OF SOLID STATE CHEMISTRY, 2001, 158 (01) :100-111
[3]   LA2CUSNO6 - A NEW PEROVSKITE-RELATED COMPOUND WITH AN UNUSUAL ARRANGEMENT OF B-CATIONS [J].
ANDERSON, MT ;
POEPPELMEIER, KR .
CHEMISTRY OF MATERIALS, 1991, 3 (03) :476-482
[4]   Role of intergrowths in the properties of naturally layered manganite single crystals [J].
Bader, SD ;
Osgood, RM ;
Miller, DJ ;
Mitchell, JF ;
Jiang, JS .
JOURNAL OF APPLIED PHYSICS, 1998, 83 (11) :6385-6389
[5]   Synthesis, structural chemistry and magnetic properties of La1+xA1-xInMnO6-δ:: A = Ba, Sr; x = 0, 0.2 [J].
Battle, PD ;
Coldea, AI ;
Jordan, NA ;
Rosseinsky, MJ ;
Singleton, J .
JOURNAL OF MATERIALS CHEMISTRY, 2001, 11 (06) :1656-1661
[6]   Synthesis, structure, and magnetic properties of n=2 Ruddlesden-Popper manganates [J].
Battle, PD ;
Rosseinsky, MJ .
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE, 1999, 4 (02) :163-170
[7]   Colossal magnetoresistance in Sr2-xNd1+xMn2O7 (x=0.0,0.1) [J].
Battle, PD ;
Blundell, SJ ;
Green, MA ;
Hayes, W ;
Honold, M ;
Klehe, AK ;
Laskey, NS ;
Millburn, JE ;
Murphy, L ;
Rosseinsky, MJ ;
Samarin, NA ;
Singleton, J ;
Sluchanko, NE ;
Sullivan, SP ;
Vente, JF .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1996, 8 (32) :L427-L434
[8]   Muon-spin-relaxation studies of magnetic order and dynamics of the n = 2 Ruddlesden-Popper phases Sr2RMn2O7 (R = Pr, Nd, Sm, Eu, Gd, Tb, Dy, and Ho) [J].
Bewley, RI ;
Blundell, SJ ;
Lovett, BW ;
Jestädt, T ;
Pratt, FL ;
Chow, KH ;
Hayes, W ;
Battle, PD ;
Green, MA ;
Millburn, JE ;
Rosseinsky, MJ ;
Spring, LE ;
Vente, JF .
PHYSICAL REVIEW B, 1999, 60 (17) :12286-12293
[9]   Control of magnetic ordering by Jahn-Teller distortions in Nd2GaMnO6 and La2GaMnO6 [J].
Cussen, EJ ;
Rosseinsky, MJ ;
Battle, PD ;
Burley, JC ;
Spring, LE ;
Vente, JF ;
Blundell, SJ ;
Coldea, AI ;
Singleton, J .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (06) :1111-1122
[10]   POWDER NEUTRON-DIFFRACTION INVESTIGATION OF NUCLEAR AND MAGNETIC-STRUCTURE OF SR2FE2O5 [J].
GREAVES, C ;
JACOBSON, AJ ;
TOFIELD, BC ;
FENDER, BEF .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1975, 31 (MAR15) :641-646