SUDDEN APPEARANCE OF AN UNUSUAL SPIN-DENSITY WAVE AT THE METAL-INSULATOR-TRANSITION IN THE PEROVSKITES RNIO3 (R=PR, ND)

被引:121
作者
GARCIAMUNOZ, JL [1 ]
RODRIGUEZCARVAJAL, J [1 ]
LACORRE, P [1 ]
机构
[1] IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120
来源
EUROPHYSICS LETTERS | 1992年 / 20卷 / 03期
关键词
D O I
10.1209/0295-5075/20/3/009
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The metal-insulator transition in the orthorhombic perovskites PrNiO3 and NdNiO3 is accompanied by the sudden 3D magnetic ordering of the Ni ions (mu(Ni) almost-equal-to 0.9 mu(B)). The magnetic ground state, described by a commensurate k = (1/2, 0, 1/2) spin density wave, is unprecedented in a perovskite structure. The coexistence of F and AF interactions suggests the existence of an orbital superlattice. This results from the breakdown of the degeneracy of the Ni(III) (t2g6 e(g)1) state due to electronic correlations. The gap is probably of charge-transfer type rather than originated by the exchange interactions.
引用
收藏
页码:241 / 247
页数:7
相关论文
共 15 条
  • [11] WHY ARE SOME OXIDES METALLIC, WHILE MOST ARE INSULATING
    TORRANCE, JB
    LACORRE, P
    ASAVAROENGCHAI, C
    METZGER, RM
    [J]. PHYSICA C, 1991, 182 (4-6): : 351 - 364
  • [12] SYSTEMATIC STUDY OF INSULATOR-METAL TRANSITIONS IN PEROVSKITES RNIO3 (R = PR, ND, SM, EU) DUE TO CLOSING OF CHARGE-TRANSFER GAP
    TORRANCE, JB
    LACORRE, P
    NAZZAL, AI
    ANSALDO, EJ
    NIEDERMAYER, C
    [J]. PHYSICAL REVIEW B, 1992, 45 (14): : 8209 - 8212
  • [13] TORRANCE JB, 1991, J SOLID STATE CHEM, V90, P225
  • [14] SYSTEMATICS IN BAND-GAPS AND OPTICAL-SPECTRA OF 3D TRANSITION-METAL COMPOUNDS
    ZAANEN, J
    SAWATZKY, GA
    [J]. JOURNAL OF SOLID STATE CHEMISTRY, 1990, 88 (01) : 8 - 27
  • [15] BAND-GAPS AND ELECTRONIC-STRUCTURE OF TRANSITION-METAL COMPOUNDS
    ZAANEN, J
    SAWATZKY, GA
    ALLEN, JW
    [J]. PHYSICAL REVIEW LETTERS, 1985, 55 (04) : 418 - 421