# Meissner Effect and Nonreciprocal Charge Transport in Non‐Topological 1T‐CrTe2/FeTe Heterostructures

## TL;DR

Researchers found that stacking a 2D magnetic material on an antiferromagnetic metal creates superconductivity and unique electrical transport properties.

## Contribution

They demonstrated superconductivity in non-topological 1T-CrTe2/FeTe heterostructures without needing topological surface states.

## Key findings

- Superconductivity with a critical temperature of ~12 K was observed in 1T-CrTe2/FeTe heterostructures.
- The Meissner effect was detected on the surface of the 1T-CrTe2 layer.
- Nonreciprocal charge transport with large magneto-chiral anisotropy was observed in the heterostructures.

## Abstract

Interface‐induced superconductivity has recently been achieved by stacking a magnetic topological insulator layer on an antiferromagnetic FeTe layer. However, the mechanism driving this emergent superconductivity remains unclear. Here, we employ molecular beam epitaxy to grow a 1T‐CrTe2 layer, a 2D ferromagnet with a Curie temperature up to room temperature, on a FeTe layer. These 1T‐CrTe2/FeTe heterostructures show superconductivity with a critical temperature of ∼12 K. Through magnetic force microscopy measurements, we observe the Meissner effect on the surface of the 1T‐CrTe2 layer. Our electrical transport measurements reveal that the 1T‐CrTe2/FeTe heterostructures exhibit nonreciprocal charge transport behavior, characterized by a large magneto‐chiral anisotropy coefficient. The enhanced nonreciprocal charge transport in 1T‐CrTe2/FeTe heterostructures provides a promising platform for exploring the magnetically controllable superconducting diode effect.

This work demonstrates interface‐induced superconductivity (T
c ∼12 K) with a robust Meissner effect and pronounced nonreciprocal transport in epitaxial 1T‐CrTe2/FeTe heterostructures, where 1T‐CrTe2 is a 2D ferromagnet, and FeTe is an antiferromagnetic metal. This finding establishes that topological surface states are not required to induce superconductivity in FeTe‐based heterostructures. The 1T‐CrTe2/FeTe heterostructures provide a platform for exploring magnetically controllable superconducting diode effects.