Antiferromagnetic order in epitaxial FeSe films on SrTiO3

Abstract

Single monolayer FeSe film grown on Nb-doped SrTiO${}_3$(001) substrate shows the highest superconducting transition temperature (T${}_C$ $\sim$ 100 K) among the iron-based superconductors (iron-pnictide), while T${}_C$ of bulk FeSe is only $\sim$ 8 K. Antiferromagnetic spin fluctuations were believed to be crucial in iron-pnictides, which has inspired several proposals to understand the FeSe/SrTiO${}_3$ system. Although bulk FeSe does not show the antiferromagnetic order, calculations suggest that the parent FeSe/SrTiO${}_3$ films are AFM. Experimentally, due to lacking of direct probe, the magnetic state of FeSe/SrTiO${}_3$ films remains mysterious. Here, we report the direct evidences of the antiferromagnetic order in the parent FeSe/SrTiO${}_3$ films by the magnetic exchange bias effect measurements. The phase transition temperature is $\ge$ 140 K for single monolayer film. The AFM order disappears after electron doping.

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• Spin-Dependent High-Order Topological Insulator and Two Types of Distinct Corner Modes in Monolayer FeSe/GdClO Heterostructure
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• Controllable magnetic anisotropy and ferroelasticity in superconducting FeSe monolayer with surface fluorine adsorption
• Spin and Orbital Rashba response in ferroelectric polarized PtSe${}_2$/MoSe${}_2$/LiNbO${}_3$ heterostructures
• LaO as a candidate substrate for realizing superconductivity in FeSe epitaxial film
• Uncovering double-stripe and plaquette antiferromagnetic states in the one-band Hubbard model on a frustrated square lattice
• Topological Aspects of Antiferromagnets
• An improved particle swarm optimization algorithm and its application to search for new magnetic ground states in the Hubbard model