Magnetic correlation and breakdown of Fermi liquid picture in frustrated itinerant electron magnet

被引:32
作者
Isoda, M [1 ]
Mori, S [1 ]
机构
[1] Fukuyama Univ, Dept Phys, Fukuyama, Hiroshima 7290292, Japan
关键词
frustration; pyrochlore; itinerant; magnetic correlation; quasiparticle mass; heavy Fermion; Y(Sc)Mn-2;
D O I
10.1143/JPSJ.69.1509
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Three-dimensional geometrically frustrated itinerant magnet is investigated based on the single band Hubbard model on the pyrochlore lattice. The magnetic correlation and the quasiparticle properties are discussed by the weak correlation approach for half-filled case, based on the single electron spectrum in consideration of the lattice geometry. The spectrum reveals the existence of doubly degenerate Rat band over the whole Brillouin zone. The spin fluctuation spectrum in RPA is anisotropic and shows the independence on frequency. The result is globally consistent with the observed in Y(Sc)Mn-2. It is also shown that the frequency spectrum is clearly different from the conventional Fermi liquid one, which brings the breakdown of the Fermi liquid picture owing to the divergence of quasiparticle mass.
引用
收藏
页码:1509 / 1516
页数:8
相关论文
共 35 条
[31]  
TAKAHASHI Y, IN PRESS
[32]   INSULATING SPIN-GLASSES [J].
VILLAIN, J .
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1979, 33 (01) :31-42
[33]   LOW-TEMPERATURE SPECIFIC-HEAT OF NEARLY FERROMAGNETIC AND ANTIFERROMAGNETIC COMPOUNDS [J].
WADA, H ;
SHIGA, M ;
NAKAMURA, Y .
PHYSICA B-CONDENSED MATTER, 1989, 161 (1-3) :197-202
[34]   ELECTRONIC-STRUCTURE AND MAGNETIC-PROPERTIES OF YM2 COMPOUNDS (M = MN, FE, CO AND NI) [J].
YAMADA, H ;
INOUE, J ;
TERAO, K ;
KANDA, S ;
SHIMIZU, M .
JOURNAL OF PHYSICS F-METAL PHYSICS, 1984, 14 (08) :1943-1960
[35]   Short-range magnetic order in the frustrated pyrochlore antiferromagnet CsNiCrF6 [J].
Zinkin, MP ;
Harris, MJ ;
Zeiske, T .
PHYSICAL REVIEW B, 1997, 56 (18) :11786-11790