The de Haas - van Alphen Effect Study of the Fermi Surface of ZrB12

TL;DR

This study investigates the Fermi surface of ZrB12 using the de Haas-van Alphen effect, combining experimental magnetic torque measurements with theoretical band-structure calculations to analyze electronic properties.

Contribution

It provides detailed experimental data on Fermi surface orbits and effective masses, and compares these with advanced theoretical calculations for ZrB12.

Findings

Detection of dHvA oscillations from specific Fermi surface sections

Measured cyclotron effective mass of 0.5m_0 for Neck section

Overall agreement between experimental data and band-structure calculations

Abstract

The de Haas - van Alphen (dHvA) effect in the cluster superconductor ZrB12 was studied by magnetic torque measurements in magnetic fields up to 28 T at temperatures down to 0.35 K. The dHvA oscillations due to orbits from the Neck sections and "Cubic Box" of the Fermi surface were detected. We measured cyclotron effective masses of 0.5m_0 for Neck section of the FS. The dHvA frequencies as well as the cyclotron effective masses were calculated using the full potential Linear Muffin-Tin Orbital (LMTO) method within the Generalized Gradient Approximation. Comparison of the angular dependence of the dHvA frequencies with the band-structure calculations implies overall agreement with theoretical model, while one section could not be definitely identified.