Anomalous Magneto-transport and Anisotropic Multigap Superconductivity in Architecturally Misfit Layered System (PbS)$_{1.13}$TaS$_2$

TL;DR

This paper explores the unique magnetotransport and multigap superconductivity in the misfit-layered compound (PbS)$_{1.13}$TaS$_2$, revealing unconventional quantum phenomena and high critical fields that could advance quantum device development.

Contribution

It demonstrates the coexistence of anomalous transport phenomena and multigap superconductivity in a natural misfit-layered system, highlighting its potential for quantum applications.

Findings

Presence of planar Hall effect and anisotropic magnetoresistance

Observation of multigap two-dimensional superconductivity

High in-plane upper critical field exceeding the Pauli limit

Abstract

Misfit-layered compounds, naturally occurring bulk heterostructures, present a compelling alternative to artificially engineered ones, offering a unique platform for exploring correlated phases and quantum phenomena. This study investigates the magnetotransport and superconducting properties of the misfit compound (PbS)$_{1.13}$TaS$_2$, comprising alternating PbS and 1$H$-TaS$_2$ layers. It exhibits distinctive transport properties, including a prominent planar Hall effect and a four-fold oscillatory Butterfly-shaped anisotropic magnetoresistance (AMR). Moreover, it shows multigap two-dimensional superconductivity with an exceptionally high in-plane upper critical field, exceeding the Pauli limit. The coexistence of unconventional superconductivity and anomalous transport - two distinct quantum phenomena, within the same material, suggests that misfit compounds provide an ideal platform for realizing quantum effects in the two-dimensional limit of bulk crystals. This opens the door to the development of simpler and more efficient quantum devices.