# Field-angle-resolved landscape of non-Fermi-liquid behavior in the quasi-kagome Kondo Lattice CeRhSn

## TL;DR

This study maps the non-Fermi-liquid behavior in a quasi-kagome Kondo lattice using magnetic field angle tuning, revealing its persistence near a metamagnetic crossover and highlighting the role of spin fluctuations along the c axis.

## Contribution

It introduces a field-angle-resolved approach to explore quantum criticality and non-Fermi-liquid behavior in an anisotropic frustrated system, uncovering the survival of non-Fermi-liquid states near a metamagnetic transition.

## Key findings

- Non-Fermi-liquid behavior persists up to ~3 T near the in-plane field orientation.
- Spin fluctuations along the c axis are key to the non-Fermi-liquid behavior.
- The entropy landscape reveals ground state degeneracy and exotic phase potential.

## Abstract

We have employed a magnetic field angle as a tuning parameter in a comprehensive measurement of the specific heat, magnetocaloric effect, and magnetization for the quasi-kagome Kondo lattice CeRhSn, which is considered to exhibit zero-field quantum criticality driven by geometrical frustration. By constructing the field-angle-resolved landscape of the entropy, we unexpectedly revealed that the non-Fermi-liquid nature survives up to a metamagnetic crossover field of roughly 3 T in the very narrow field-orientation range, close to the direction parallel to the quasi-kagome plane. We propose that spin fluctuations along the hexagonal $c$ axis are the dominant driving force for the non-Fermi-liquid behavior because it is strongly suppressed by a magnetic-field component along the $c$ axis. The multidimensional entropy landscape, which directly reflects the degeneracy of ground states, opens a new route for uncovering the nature of exotic phases in anisotropic systems.