Magnetic frustration in a metallic fcc lattice

Abstract

Magnetic frustration in metals is scarce and hard to pinpoint, but exciting due to the possibility of the emergence of fascinating novel phases. The cubic intermetallic compound HoInCu4 with all holmium atoms on an fcc lattice, exhibits partial magnetic frustration, yielding a ground state where half of the Ho moments remain without long-range order, as evidenced by our neutron scattering experiments. The substitution of In with Cd results in HoCdCu4 in a full breakdown of magnetic frustration. Consequently we found a fully ordered magnetic structure in our neutron diffraction experiments. These findings are in agreement with the local energy scales and crystal electric field excitations, which we determined from specific heat and inelastic neutron scattering data. The electronic density of states for the itinerant bands acts as tuning parameter for the ratio between nearest-neighbor and next-nearest-neighbor interactions and thus for magnetic frustration. arXiv:1907.09885v1 [cond-mat.str-el]

Quantum phases driven by strong correlations

“…Yet, so far, frustration in heavy fermion systems is discussed mostly in terms of the more intuitive concept of local moments situated on (partially) frustrated lattices [97][98][99][100][101][102][103] . Examples are Pr 2 Ir 2 O 7 with a pyrochlore lattice of Pr atoms 97,103 , CeRhSn 100 and CePdAl 99,102 with Ce atoms located on distorted kagome planes, and HoInCu 4 with an fcc lattice of the Ho atoms 104 (though the Kondo interaction in this low-carrier density system is likely negligible).…”

Anisotropic magnetic property of single crystals $R$V$_6$Sn$_6$ ($R$ = Y, Gd - Tm, Lu)

“…The reduced entropy may raise the possibility of a mixed magnetic structure, where both magnetic and non-magnetic sites coexist on an equivalent crystallographic site. This kind of magnetic structure has been evident in geometrically frustrated metallic systems [45][46][47]. It has also been shown theoretically and experimentally that the RKKY inter-action in two dimensional hexagonal lattice gives rise to complex spin structures and potentially hosts a skyrmion phase in conjunction with geometrical frustration [48][49][50].…”

Field-Direction Sensitive Skyrmion Crystals in Cubic Chiral Systems: Implication to 4f-Electron Compound EuPtSi

“…The above results indicate the emergence of various types of SkXs for the different lattice structures and the magnetic-field direction. Since several lattice structures, such as a zinc-blende structure, cubic half-Heusler structure, A-site cation-ordered spinel structure in LiFeCr 4 O 8 [43], and other cubic structures like Ho(In,Cd)Cu 4 [44], has the T d symmetry, the SkX might be expected by applying external pressure.…”