Microscopic Origin of Reduced Magnetic Order in a Frustrated Metal

• DOI: 10.48550/arxiv.2502.08523
• Publication Date: 2025-02-12
• Authors: X. Boraley; O. Stockert; Jakob Lass; Romain Sibille; Øystein S. Fjellvåg; S. Moody; Andreas M. Läuchli; V. Fritsch; D. G. Mazzone
• Keywords: Condensed Matter - Strongly Correlated Electrons; Strongly Correlated Electrons (cond-mat.str-el); FOS: Physical sciences

Although magnetic frustration in metals provides a promising avenue for novel quantum phenomena, their microscopic interpretation is often challenging. Here we use the face-centered cubic intermetallic HoInCu$_4$ as model material to show that Hamiltonians neglecting charge degree of freedom are appropriate frustrated possessing low density states at Fermi surface. Through neutron scattering techniques determine matching exchange interactions paramagnetic and field-polarized using an effective spin-1 Heisenberg Hamiltonian, which identify antiferromagnetic nearest next-nearest neighbour $J_1$ $J_2$ close critical ratio $J_2$/$J_1$ = 1/2. The study further evidence spin-wave theory fails predict low-energy spin dynamics zero-field state, dominated by overdamped excitations. We conclude fluctuations arise from fluctuations, accounting missing moment strongly renormalized long-range order.