NEUTRON-POWDER-DIFFRACTION STUDY OF THE NUCLEAR AND MAGNETIC-STRUCTURES OF YBA2FE3O8 AT ROOM-TEMPERATURE

被引:78
作者
HUANG, Q
KAREN, P
KAREN, VL
KJEKSHUS, A
LYNN, JW
MIGHELL, AD
ROSOV, N
SANTORO, A
机构
[1] UNIV OSLO,DEPT CHEM,N-0315 OSLO 3,NORWAY
[2] UNIV MARYLAND,CTR SUPERCONDUCT RES,DEPT PHYS,COLLEGE PK,MD 20742
来源
PHYSICAL REVIEW B | 1992年 / 45卷 / 17期
关键词
D O I
10.1103/PhysRevB.45.9611
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The nuclear and magnetic structures of YBa2Fe3O8 have been investigated by powder neutron diffraction at room temperature. The nuclear structure of the compound has the symmetry of space group P4/mmm and lattice parameters a = 3.9170(1) and c = 11.8252(4) angstrom. The configuration of the atoms in the unit cell is very similar to that of the superconductor YBa2Cu3O7, with the exception that the iron ions corresponding to the Cu-chain ions have octahedral coordination, rather than square planar; the octahedra thus are arranged in layers rather than in chains. This significant difference is a consequence of the fact that all possible oxygen sites in these layers are fully occupied, resulting in an oxygen content of eight rather than seven atoms per formula unit. A second consequence of the full occupancy of the oxygen sites is that the Ba ions have a twelvefold cuboctahedral coordination in the iron compound, rather than tenfold. The magnetic structure is based on a unit cell related to that of the nuclear structure by an axis transformation of matrix (110BAR/110/002). The magnetic origin of the extra intensities and the basic spin configuration were determined by polarized-neutron-diffraction measurements. The iron moments are coupled antiferromagnetically within each FeO2 layer, as well as along the c axis. The magnetic moments of all the iron ions are the same with a value of 3.49(2)mu(B). This configuration results in the magnetic symmetry I(c)mm'm.
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页码:9611 / 9619
页数:9
相关论文
共 25 条
  • [1] ANDRESEN PH, IN PRESS ACTA CHEM S
  • [2] BACON GE, 1975, NEUTRON DIFFRACTION, P275
  • [3] NEUTRON AND ELECTRON-DIFFRACTION STUDY OF YBA2CU22CU1.77FE.23O7.13
    BORDET, P
    HODEAU, JL
    STROBEL, P
    MAREZIO, M
    SANTORO, A
    [J]. SOLID STATE COMMUNICATIONS, 1988, 66 (04) : 435 - 439
  • [4] BOND-VALENCE PARAMETERS OBTAINED FROM A SYSTEMATIC ANALYSIS OF THE INORGANIC CRYSTAL-STRUCTURE DATABASE
    BROWN, ID
    ALTERMATT, D
    [J]. ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1985, 41 (AUG): : 244 - 247
  • [5] UNEXPECTED EFFECTS OF GOLD ON THE STRUCTURE, SUPERCONDUCTIVITY, AND NORMAL STATE OF YBA2CU3O7
    CIEPLAK, MZ
    XIAO, G
    CHIEN, CL
    STALICK, JK
    RHYNE, JJ
    [J]. APPLIED PHYSICS LETTERS, 1990, 57 (09) : 934 - 936
  • [6] STRUCTURAL BEHAVIOR AND CHEMICAL ORDER OF FE IN YBA2(CU1-XFEX)3O7+DELTA
    DUNLAP, BD
    JORGENSEN, JD
    SEGRE, C
    DWIGHT, AE
    MATYKIEWICZ, JL
    LEE, H
    PENG, W
    KIMBALL, CW
    [J]. PHYSICA C, 1989, 158 (03): : 397 - 405
  • [7] SYNTHESIS AND STRUCTURE OF 1,2,3-TYPE CERAMIC OXIDES CONTAINING COBALT INSTEAD OF COPPER
    GEREMIA, S
    NARDIN, G
    MOSCA, R
    RANDACCIO, L
    ZANGRANDO, E
    [J]. SOLID STATE COMMUNICATIONS, 1989, 72 (04) : 333 - 336
  • [8] NB AND TA SUBSTITUTIONS IN YBA2CU3O7-X AND RELATED PHASES - STRUCTURAL CHARACTERIZATION OF LA1.1BA1.9CU2.1M0.9O8 (M=NB,TA)
    GREAVES, C
    SLATER, PR
    [J]. PHYSICA C, 1989, 161 (02): : 245 - 251
  • [9] HUANG Q, UNPUB
  • [10] MAGNETIC ORDER OF THE CU PLANES AND CHAINS IN RBA2CU3O6+X
    LI, WH
    LYNN, JW
    FISK, Z
    [J]. PHYSICAL REVIEW B, 1990, 41 (07): : 4098 - 4111