Double epitaxy of tetragonal and hexagonal phases in the FeSe system

S. B. Harris; R. P. Camata

doi:10.1016/j.jcrysgro.2019.01.031

Double epitaxy of tetragonal and hexagonal phases in the FeSe system

S. B. Harris, R. P. Camata

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Epitaxial films which contain more than one crystallographic phase or orientation are of interest due to the possibility of altered magnetic, electrical, and optical properties. Thin films of FeSe have been grown on single-crystal MgO substrates under conditions that produce the simultaneous, epitaxial growth of tetragonal and hexagonal phases. We show that this double epitaxy is characterized by phase domains with a well-defined epitaxial relationship to each other and that the relative phase fraction can be controlled. For growth temperatures of 350–450 °C, the (0 0 1)-oriented tetragonal phase (β-FeSe) grows with its unit cell aligned with the cubic substrate, while a (1 0 1)-oriented hexagonal phase (Fe ₇ Se ₈ ) shows domains with two different in-plane orientations separated by 45°. Additionally, the β-FeSe phase can be chosen to be (0 0 1)- or (1 0 1)-oriented with respect to the substrate, with the (1 0 1) orientation containing three rotated domains.

Original language	English
Pages (from-to)	54-59
Number of pages	6
Journal	Journal of Crystal Growth
Volume	514
DOIs	https://doi.org/10.1016/j.jcrysgro.2019.01.031
State	Published - May 15 2019
Externally published	Yes

Funding

The authors wish to thank David J. Hilton, Ashlyn D. Burch, Sergey B. Mirov, and Vladimir V. Fedorov for helpful discussions. We are also thankful to S. Aaron Catledge and Tracy G. Hastings for assistance with the AFM measurements. SBH acknowledges graduate fellowship support from the NASA Alabama Space Grant Consortium (ASGC) under award NNX15AJ18H. This work was supported in part by the Air Force Office of Scientific Research (AFOSR) under award FA9550-13-1-0234 and by the NSF Major Research Instrumentation (MRI) Grant No. DMR-1725016 . Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation or the Air Force Office of Scientific Research.

Funders	Funder number
National Science Foundation	DMR-1725016
Directorate for Mathematical and Physical Sciences	1725016
Air Force Office of Scientific Research	FA9550-13-1-0234
Alabama Space Grant Consortium
Arkansas Space Grant Consortium	NNX15AJ18H

Keywords

A1. Double epitaxy
B1. Cu-doped iron selenide
B1. Fe Se
B1. FeSe
B1. Iron selenide
B2. Iron-based superconductor

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10.1016/j.jcrysgro.2019.01.031

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title = "Double epitaxy of tetragonal and hexagonal phases in the FeSe system",

abstract = " Epitaxial films which contain more than one crystallographic phase or orientation are of interest due to the possibility of altered magnetic, electrical, and optical properties. Thin films of FeSe have been grown on single-crystal MgO substrates under conditions that produce the simultaneous, epitaxial growth of tetragonal and hexagonal phases. We show that this double epitaxy is characterized by phase domains with a well-defined epitaxial relationship to each other and that the relative phase fraction can be controlled. For growth temperatures of 350–450 °C, the (0 0 1)-oriented tetragonal phase (β-FeSe) grows with its unit cell aligned with the cubic substrate, while a (1 0 1)-oriented hexagonal phase (Fe 7 Se 8 ) shows domains with two different in-plane orientations separated by 45°. Additionally, the β-FeSe phase can be chosen to be (0 0 1)- or (1 0 1)-oriented with respect to the substrate, with the (1 0 1) orientation containing three rotated domains.",

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AU - Camata, R. P.

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N2 - Epitaxial films which contain more than one crystallographic phase or orientation are of interest due to the possibility of altered magnetic, electrical, and optical properties. Thin films of FeSe have been grown on single-crystal MgO substrates under conditions that produce the simultaneous, epitaxial growth of tetragonal and hexagonal phases. We show that this double epitaxy is characterized by phase domains with a well-defined epitaxial relationship to each other and that the relative phase fraction can be controlled. For growth temperatures of 350–450 °C, the (0 0 1)-oriented tetragonal phase (β-FeSe) grows with its unit cell aligned with the cubic substrate, while a (1 0 1)-oriented hexagonal phase (Fe 7 Se 8 ) shows domains with two different in-plane orientations separated by 45°. Additionally, the β-FeSe phase can be chosen to be (0 0 1)- or (1 0 1)-oriented with respect to the substrate, with the (1 0 1) orientation containing three rotated domains.

AB - Epitaxial films which contain more than one crystallographic phase or orientation are of interest due to the possibility of altered magnetic, electrical, and optical properties. Thin films of FeSe have been grown on single-crystal MgO substrates under conditions that produce the simultaneous, epitaxial growth of tetragonal and hexagonal phases. We show that this double epitaxy is characterized by phase domains with a well-defined epitaxial relationship to each other and that the relative phase fraction can be controlled. For growth temperatures of 350–450 °C, the (0 0 1)-oriented tetragonal phase (β-FeSe) grows with its unit cell aligned with the cubic substrate, while a (1 0 1)-oriented hexagonal phase (Fe 7 Se 8 ) shows domains with two different in-plane orientations separated by 45°. Additionally, the β-FeSe phase can be chosen to be (0 0 1)- or (1 0 1)-oriented with respect to the substrate, with the (1 0 1) orientation containing three rotated domains.

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Double epitaxy of tetragonal and hexagonal phases in the FeSe system

Abstract

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Keywords

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