Dissipative diamagnetism with anomalous coupling and third law

TL;DR

This paper investigates how different dissipative couplings affect low-temperature thermodynamics in diamagnetic systems, showing that dissipation modifies entropy decay and that certain couplings uphold the third law.

Contribution

It introduces analysis of anomalous and velocity-velocity couplings in dissipative diamagnetism, demonstrating their impact on entropy behavior and the validity of the third law at low temperatures.

Findings

Entropy vanishes linearly with temperature for Ohmic bath.

Anomalous coupling causes faster entropy decay than usual coupling.

Velocity-velocity coupling best ensures the third law.

Abstract

In this work, low temperature thermodynamic behaviour in the context of dissipative diamagnetism with anomalous coupling is analyzed. We find that finite dissipation substitutes the zero-coupling result of exponential decay of entropy by a power law behaviour at low temperature. For Ohmic bath, entropy vanishes linearly with temperature, $T$, in conformity with Nernst's theorem. It is also shown that entropy decays faster in the presence of anomalous coupling than that of the usual coordinate-coordinate coupling. It is observed that velocity-velocity coupling is the most advantageous coupling scheme to ensure the third law of thermodynamics. It is also revealed that different thermodynamic functions are independent of magnetic field at very low temperature for various coupling schemes discussed in this work.