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Microscopic Origin of Reduced Magnetic Order in a Frustrated Metal
X Boraley1, O Stockert2, J Lass1
1PSI Center for Neutron and Muon Sciences, 5232 Villigen PSI, Switzerland.
Physical Review Letters
|August 12, 2025
Summary
Magnetic frustration in HoInCu4 is explained by a simplified spin Hamiltonian, revealing quantum fluctuations drive low-energy spin dynamics and renormalized magnetic order in frustrated metals.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Magnetism
Background:
- Magnetic frustration in metals offers pathways to novel quantum phenomena but presents interpretation challenges.
- Understanding microscopic mechanisms in frustrated metals is crucial for developing new quantum materials.
Purpose of the Study:
- To investigate the microscopic interpretation of magnetic frustration in the intermetallic compound HoInCu4.
- To determine the suitability of Hamiltonians neglecting charge degrees of freedom for frustrated metals with low Fermi surface density of states.
Main Methods:
- Utilized neutron scattering techniques to probe magnetic exchange interactions.
- Employed an effective spin-1 Heisenberg Hamiltonian for analysis.
- Investigated both paramagnetic and field-polarized states of HoInCu4.
Main Results:
- Identified antiferromagnetic nearest (J1) and next-nearest-neighbor (J2) interactions, with J2/J1 close to the critical ratio of 1/2.
- Observed that spin-wave theory fails to predict low-energy spin dynamics in the zero-field state.
- Found low-energy magnetic excitations to be overdamped, suggesting dominance by quantum fluctuations.
Conclusions:
- Hamiltonians neglecting charge degrees of freedom are appropriate for frustrated metals with low density of states at the Fermi surface.
- Quantum fluctuations are responsible for low-energy spin dynamics and the missing magnetic moment in HoInCu4.
- The material exhibits strongly renormalized magnetic long-range order due to these quantum fluctuations.
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