On Nernst effect and quantum oscillations in NCCO

TL;DR

This paper models NCCO's electronic structure to analyze quantum oscillations and the Nernst effect, revealing doping-dependent oscillation frequencies linked to hole pockets in the material.

Contribution

It provides a theoretical framework connecting mean field Hamiltonian calculations to observable quantum oscillations and Nernst effect in NCCO.

Findings

Slow oscillations (~330 T) from hole pockets at optimal doping

Faster oscillations (~900 T) at higher doping levels

Derived expressions for entropy, density of states, and conductivity

Abstract

We start with a mean field Hamiltonian in momentum space for NCCO to investigate the magnetic quantum oscillations (MQO) exhibited by this system in the normal state. We first obtain an expression for the entropy of the system which is useful to explain the Nernst effect. We next derive the density of states at Fermi energy and the longitudinal electrical conductivity expression to explore the possibility of MQO. We find that the slow (1/B)-oscillations, with frequency nearly 330 T, arise from the hole pockets at the optimal doping. The faster oscillations at slightly higher doping level is found to have the frequency nearly equal to 900 T.