High Field de Haas - van Alphen Studies of the Fermi Surfaces of LaMIn$_{5}$ (M = Co, Rh, Ir)

TL;DR

This study investigates the Fermi surface geometries of LaMIn$_{5}$ compounds (M = Co, Rh, Ir) using de Haas-van Alphen measurements, revealing varying degrees of two-dimensionality linked to d-electron character and implications for heavy fermion phenomena.

Contribution

First detailed de Haas-van Alphen analysis of LaMIn$_{5}$ compounds showing the relationship between Fermi surface dimensionality and d-electron character.

Findings

LaCoIn$_{5}$ has highly two-dimensional Fermi surface regions.

LaIrIn$_{5}$ exhibits some two-dimensional Fermi surface features.

All effective masses are ≤ 1.2, indicating limited mass enhancement.

Abstract

We report measurements of the de Haas - van Alphen effect on a series of compounds, LaMIn$_{5}$ (M = Co, Rh, Ir). The results show that each of the Co and Ir Fermi surfaces (FSs) exhibit some portions that are two dimensional and some portions that are three dimensional. The most two dimensional character is exhibited in LaCoIn$_{5}$, less two dimensional behavior is seen in LaIrIn$_{5}$, no part of Fermi surface of LaRhIn$_{5}$ is found to have a two dimensional character. Thus the two dimensionality of portions of the FSs is largely determined by the d character of the energy bands while all of the effective masses remain $\leq$ 1.2. This fact has implications for the causes of the heavy fermion nature of superconductivity and magnetism in the Ce-based compounds having the similar composition and structure. All of the measurements were performed at the National High Magnetic Field Laboratory using either cantilever magnetometry or field modulation methods.