Angle Dependent Magnetoresistance of the Layered Organic Superconductor \kappa-(ET)2Cu(NCS)2: Simulation and Experiment

TL;DR

This study combines simulations and experiments to analyze the angle-dependent magnetoresistance in a layered organic superconductor, revealing subtle isotopic effects and demonstrating that semi-classical models suffice to explain interlayer transport.

Contribution

The paper provides detailed simulations distinguishing AMRO features in -(ET)2Cu(NCS)2 and shows that semi-classical models can explain the interlayer transport without invoking non-Fermi liquid effects.

Findings

No significant difference in electronic parameters between isotopic substitutions.

Interlayer transfer integrals show slight isotopic variation.

Semi-classical simulations successfully reproduce experimental AMRO data.

Abstract

The angle-dependences of the magnetoresistance of two different isotopic substitutions (deuterated and undeuterated) of the layered organic superconductor \kappa-(ET)2Cu(NCS)2 are presented. The angle dependent magnetoresistance oscillations (AMRO) arising from the quasi-one-dimensional (Q1D) and quasi-two-dimensional (Q2D) Fermi surfaces in this material are often confused. By using the Boltzman transport equation extensive simulations of the AMRO are made that reveal the subtle differences between the different species of oscillation. No significant differences are observed in the electronic parameters derived from quantum oscillations and AMRO for the two isotopic substitutions. The interlayer transfer integrals are determined for both isotopic substitutions and a slight difference is observed which may account for the negative isotope effect previously reported [1]. The success of the semi-classical simulations suggests that non-Fermi liquid effects are not required to explain the interlayer-transport in this system.