Theory of Thermodynamic Magnetic Oscillations in Quasi-One-Dimensional Conductors

TL;DR

This paper introduces a new mechanism for thermodynamic magnetic oscillations in quasi-one-dimensional conductors, explaining experimental observations without relying on closed electron orbits, through electron interaction effects.

Contribution

It calculates the second order electron interaction correction to free energy and demonstrates its role in magnetic oscillations in quasi-one-dimensional conductors.

Findings

Magnetic oscillations occur in specific heat, magnetization, and torque.

The mechanism explains behavior of (TMTSF)$_2$ClO$_4$ without closed electron orbits.

Oscillations depend on magnetic field orientation and magnitude.

Abstract

The second order correction to free energy due to the interaction between electrons is calculated for a quasi-one-dimensional conductor exposed to a magnetic field perpendicular to the chains. It is found that specific heat, magnetization and torque oscillate when the magnetic field is rotated in the plane perpendicular to the chains or when the magnitude of magnetic filed is changed. This new mechanism of thermodynamic magnetic oscillations in metals, which is not related to the presence of any closed electron orbits, is applied to explain behavior of the organic conductor (TMTSF)$_2$ClO$_4$.