High-field de Haas–van Alphen studies of the Fermi surfaces of LaMIn5 (M=Co,Rh,Ir)

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We report measurements of the de Haas--van Alphen effect on a series of compounds, $\text{La}M{\text{In}}_{5}$ $(M=\text{Co},\text{Rh},\text{Ir})$. The results show that each of the Co and Ir Fermi surfaces (FSs) exhibits some portions that are two dimensional and some portions that are three dimensional. The most two-dimensional character is exhibited in ${\text{LaCoIn}}_{5}$, less two-dimensional behavior is seen in ${\text{LaIrIn}}_{5}$, and no part of Fermi surface of ${\text{LaRhIn}}_{5}$ 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 $\ensuremath{\le}1.2$. This fact has implications for the causes of the heavy fermion nature of superconductivity and magnetism in the Ce-based compounds having similar composition and structure.