Structural and magnetic study of PrBaCo2O5+δ (δ≃0.75) cobaltite -: art. no. 184428

被引:42
作者
Frontera, C
García-Muñoz, JL
Carrillo, AE
Ritter, C
Marero, DMY
Caneiro, A
机构
[1] CSIC, Inst Ciencia Mat Barcelona, E-08193 Barcelona, Spain
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
[3] CSIC, Inst Ciencia Mat Aragon, Zaragoza, Spain
[4] Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
关键词
D O I
10.1103/PhysRevB.70.184428
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have investigated the structural and magnetic properties of PrBaCo2O5+delta (deltasimilar or equal to0.75) layered cobaltite. By means of neutron and synchrotron x-ray powder diffraction we have determined the ordered distribution of oxygen vacancies in PrOdelta planes. This order doubles both a and b lattice parameters from the perovskite cell parameter, forming a tetragonal (rather than orthorhombic) structure. On cooling, a paramagnetic to ferromagnetic and an incomplete ferromagnetic to antiferromagnetic transition take place. This second transition leads to a coexistence of ferromagnetic and antiferromagnetic order, forming a canted G-type antiferromagnetic structure. Magnetic data above the ferromagnetic transition evidence a large value of the effective paramagnetic moment of Co, implying that, well below room temperature, Co3+ ions in an octahedral environment present a high-spin state, in contrast to RBaCo2O5.5 cobaltites.
引用
收藏
页码:1 / 9
页数:9
相关论文
共 20 条
[1]   Magnetic and M-I Transitions in YBaCo2O5+x (O≤x≤0.5) [J].
Akahoshi, D ;
Ueda, Y .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1999, 68 (03) :736-739
[2]   Structural and magnetic chemistry of NdBaCo2O5+δ [J].
Burley, JC ;
Mitchell, JF ;
Short, S ;
Miller, D ;
Tang, Y .
JOURNAL OF SOLID STATE CHEMISTRY, 2003, 170 (02) :339-350
[3]   ADAPTATION OF AN ELECTROCHEMICAL SYSTEM FOR MEASUREMENT AND REGULATION OF OXYGEN PARTIAL-PRESSURE TO A SYMMETRICAL THERMOGRAVIMETRIC ANALYSIS SYSTEM DEVELOPED USING A CAHN 1000 ELECTROBALANCE [J].
CANEIRO, A ;
BAVDAZ, P ;
FOULETIER, J ;
ABRIATA, JP .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1982, 53 (07) :1072-1075
[4]   Spin-state ordered clusters in the perovskite NdBaCo2O5.47 -: art. no. 184421 [J].
Fauth, F ;
Suard, E ;
Caignaert, V ;
Mirebeau, I .
PHYSICAL REVIEW B, 2002, 66 (18) :1-5
[5]   Selective spin-state switch and metal-insulator transition in GdBaCo2O5.5 -: art. no. 180405 [J].
Frontera, C ;
García-Muñoz, JL ;
Llobet, A ;
Aranda, MAG .
PHYSICAL REVIEW B, 2002, 65 (18) :1-4
[6]   Metallicity and thermopower of the misfit cobaltite [Bi2Ba1.8Co0.2O4]RS[CoO2]2 -: art. no. 045112 [J].
Hervieu, M ;
Maignan, A ;
Michel, C ;
Hardy, V ;
Créon, N ;
Raveau, B .
PHYSICAL REVIEW B, 2003, 67 (04)
[7]   Anisotropic magnetic, magnetoresistance, and electrotransport properties of GdBaCo2O5.5 single crystals -: art. no. 214421 [J].
Khalyavin, DD ;
Barilo, SN ;
Shiryaev, SV ;
Bychkov, GL ;
Troyanchuk, IO ;
Furrer, A ;
Allenspach, P ;
Szymczak, H ;
Szymczak, R .
PHYSICAL REVIEW B, 2003, 67 (21)
[8]   Large thermopower in metallic misfit cobaltites [J].
Maignan, A ;
Wang, LB ;
Hébert, S ;
Pelloquin, D ;
Raveau, B .
CHEMISTRY OF MATERIALS, 2002, 14 (03) :1231-1235
[9]   Structural and magnetic studies of ordered oxygen-deficient perovskites LnBaCo2O5+δ, closely related to the "112" structure [J].
Maignan, A ;
Martin, C ;
Pelloquin, D ;
Nguyen, N ;
Raveau, B .
JOURNAL OF SOLID STATE CHEMISTRY, 1999, 142 (02) :247-260
[10]   Metal-insulator transition induced by a spin-state transition in TbBaCo2O5+δ (δ=0.5) [J].
Moritomo, Y ;
Akimoto, T ;
Takeo, M ;
Machida, A ;
Nishibori, E ;
Takata, M ;
Sakata, M ;
Ohoyama, K ;
Nakamura, A .
PHYSICAL REVIEW B, 2000, 61 (20) :13325-13328