Substrate Charge Transfer Induced Ferromagnetism in MnSe/SrTiO3 Ultrathin Films

Author:

Huang Chun-Hao1,Gantepogu Chandra Shekar123,Chen Peng-Jen4,Wu Ting-Hsuan12ORCID,Liu Wei-Rein5,Lin Kung-Hsuan1ORCID,Chen Chi-Liang5ORCID,Lee Ting-Kuo16ORCID,Wang Ming-Jye17ORCID,Wu Maw-Kuen1

Affiliation:

1. Institute of Physics, Academia Sinica, Taipei 11529, Taiwan

2. Department of Physics, National Taiwan University, Taipei 10617, Taiwan

3. Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan

4. Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan

5. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

6. Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan

7. Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, Taiwan

Abstract

The observation of superconductivity in MnSe at 12 GPa motivated us to investigate whether superconductivity could be induced in MnSe at ambient conditions. A strain-induced structural change in the ultrathin film could be one route to the emergence of superconductivity. In this report, we present the physical property of MnSe ultrathin films, which become tetragonal (stretched ab-plane and shortened c-axis) on a (001) SrTiO3 (STO) substrate, prepared by the pulsed laser deposition (PLD) method. The physical properties of the tetragonal MnSe ultrathin films exhibit very different characteristics from those of the thick films and polycrystalline samples. The tetragonal MnSe films show substantial conductivity enhancement, which could be associated with the presence of superparamagnetism. The optical absorption data indicate that the electron transition through the indirect bandgap to the conduction band is significantly enhanced in tetragonal MnSe. Furthermore, the X-ray Mn L-edge absorption results also reveal an increase in unoccupied state valance bands. This theoretical study suggests that charge transfer from the substrate plays an important role in conductivity enhancement and the emergence of a ferromagnetic order that leads to superparamagnetism.

Funder

Ministry of Science and Technology

Academia Sinica Thematic Research

Publisher

MDPI AG

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