Contact-less measurements of Shubnikov-de Haas oscillations in the magnetically ordered state of CeAgSb$_2$ and SmAgSb$_2$ single crystals

TL;DR

This study employs contact-less techniques to measure Shubnikov-de Haas oscillations in single crystals of magnetic compounds CeAgSb$_2$ and SmAgSb$_2$, revealing insights into their electronic structures and magnetic effects.

Contribution

It introduces a contact-less method using a tunnel diode resonator to analyze SdH oscillations in magnetic materials, providing detailed Fermi surface information.

Findings

Magnetic ordering influences Fermi surface topology.

Resistivity oscillations detected via skin depth variation.

High-resolution measurements enable detailed spectral analysis.

Abstract

Shubnikov - de Haas oscillations were measured in single crystals of highly metallic antiferromagnetic SmAgSb$_{2}$ and ferromagnetic CeAgSb$_{2}$ using a tunnel diode resonator. Resistivity oscillations as a function of applied magnetic field were observed via measurements of skin depth variation. The effective resolution of $\Delta\rho\simeq20$ p$\Omega$ allows a detailed study of the SdH spectra as a function of temperature. The effects of the Sm long - range magnetic ordering as well as its electronic structure ($4f$-electrons) on the Fermi surface topology is discussed.