NEUTRON-POWDER-DIFFRACTION STUDY OF THE NUCLEAR AND MAGNETIC-STRUCTURES OF THE ANTIFERROMAGNETIC SUPERCONDUCTOR HONI2B2C

被引:60
作者
HUANG, Q
SANTORO, A
GRIGEREIT, TE
LYNN, JW
CAVA, RJ
KRAJEWSKI, JJ
PECK, WF
机构
[1] UNIV MARYLAND,CTR SUPERCONDUCT RES,COLLEGE PK,MD 20742
[2] AT&T BELL LABS,MURRAY HILL,NJ 07974
来源
PHYSICAL REVIEW B | 1995年 / 51卷 / 06期
关键词
D O I
10.1103/PhysRevB.51.3701
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The nuclear and magnetic structures of HoNi2B2C have been investigated by neutron-powder-diffraction methods at room temperature and at 10, 5.1, and 2.2 K. The compound crystallizes with the symmetry of space group I4/mmm and lattice parameters a=3.5170(1) and c=10.5217(3) , at room temperature. The structure may be regarded as formed of (HoC) layers with the rock salt configuration alternating with (B)(Ni2)(B) blocks having a fluorite-type arrangement of the atoms. No phase transition of the nuclear structure has been observed down to a temperature of 2.2 K. Magnetic peaks begin to appear at about 8 K. The magnetic structure is the superposition of two configurations, one in which ferromagnetic sheets of holmium spins parallel to the a,b plane are coupled antiferromagnetically along the c axis (magnetic space group Pm'mm'), and another in which ferromagnetic planes are rotated away from the antiparallel configuration to give an incommensurate helicoidal structure with a period approximately equal to 12 times the length of the c axis. © 1995 The American Physical Society.
引用
收藏
页码:3701 / 3708
页数:8
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