1
|
Guo N, Chen X, Yu T, Fan Y, Zhang Q, Lei M, Xu X, Zhu X, Guo J, Gu L, Xu H, Peng R, Feng D. Inferior Interfacial Superconductivity in 1 UC FeSe/SrVO 3/SrTiO 3 with Screened Interfacial Electron-Phonon Coupling. NANO LETTERS 2024; 24:8587-8594. [PMID: 38967395 DOI: 10.1021/acs.nanolett.4c01612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
Single-unit cell (1 UC) FeSe interfaced with TiOx or FeOx exhibits significantly enhanced superconductivity compared to that of bulk FeSe, with interfacial electron-phonon coupling (EPC) playing a crucial role. However, the reduced dimensionality in 1 UC FeSe, which may drive superconducting fluctuations, complicates our understanding of the enhancement mechanisms. We construct a new superconducting interface, 1 UC FeSe/SrVO3/SrTiO3. Here, the itinerant electrons of highly metallic SrVO3 films can screen all high-energy Fuchs-Kliewer phonons, including those of SrTiO3, making it the first FeSe/oxide system with screened interfacial EPC while maintaining the 1 UC FeSe thickness. Despite comparable doping levels, the heavily electron-doped 1 UC FeSe/SrVO3 exhibits a pairing temperature (Tg ∼ 48 K) lower than those of FeSe/SrTiO3 and FeSe/LaFeO3. Our findings disentangle the contributions of interfacial EPC from dimensionality in terms of enhancing Tg in FeSe/oxide interfaces, underscoring the critical importance of interfacial EPC. This FeSe/VOx interface also provides a platform for studying interfacial superconductivity.
Collapse
Affiliation(s)
- Nan Guo
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Xiaoyang Chen
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Tianlun Yu
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Yu Fan
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Minyinan Lei
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Xiaofeng Xu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xuetao Zhu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Jiandong Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Haichao Xu
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Rui Peng
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Donglai Feng
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
- National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
- New Cornerstone Science Laboratory, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| |
Collapse
|
2
|
Mazzola F, Hassani H, Amoroso D, Chaluvadi SK, Fujii J, Polewczyk V, Rajak P, Koegler M, Ciancio R, Partoens B, Rossi G, Vobornik I, Ghosez P, Orgiani P. Unveiling the Electronic Structure of Pseudotetragonal WO 3 Thin Films. J Phys Chem Lett 2023; 14:7208-7214. [PMID: 37551605 PMCID: PMC10440808 DOI: 10.1021/acs.jpclett.3c01546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/26/2023] [Indexed: 08/09/2023]
Abstract
WO3 is a 5d compound that undergoes several structural transitions in its bulk form. Its versatility is well-documented, with a wide range of applications, such as flexopiezoelectricity, electrochromism, gating-induced phase transitions, and its ability to improve the performance of Li-based batteries. The synthesis of WO3 thin films holds promise in stabilizing electronic phases for practical applications. However, despite its potential, the electronic structure of this material remains experimentally unexplored. Furthermore, its thermal instability limits its use in certain technological devices. Here, we employ tensile strain to stabilize WO3 thin films, which we call the pseudotetragonal phase, and investigate its electronic structure using a combination of photoelectron spectroscopy and density functional theory calculations. This study reveals the Fermiology of the system, notably identifying significant energy splittings between different orbital manifolds arising from atomic distortions. These splittings, along with the system's thermal stability, offer a potential avenue for controlling inter- and intraband scattering for electronic applications.
Collapse
Affiliation(s)
- F. Mazzola
- Department
of Molecular Sciences and Nanosystems, Ca’
Foscari University of Venice, 30172 Venice, Italy
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - H. Hassani
- Theoretical
Materials Physics, Q-MAT, CESAM, Université
de Liège, B-4000 Liège, Belgium
- Department
of Physics, University of Antwerp, 2020 Antwerp, Belgium
| | - D. Amoroso
- Theoretical
Materials Physics, Q-MAT, CESAM, Université
de Liège, B-4000 Liège, Belgium
| | - S. K. Chaluvadi
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - J. Fujii
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - V. Polewczyk
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - P. Rajak
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - Max Koegler
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - R. Ciancio
- Area
Science Park, Padriciano
99, 34149 Trieste, Italy
| | - B. Partoens
- Department
of Physics, University of Antwerp, 2020 Antwerp, Belgium
| | - G. Rossi
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
- University
of Milano, I-20133 Milano, Italy
| | - I. Vobornik
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - P. Ghosez
- Theoretical
Materials Physics, Q-MAT, CESAM, Université
de Liège, B-4000 Liège, Belgium
| | - P. Orgiani
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| |
Collapse
|
3
|
Kumar D, David A, Fouchet A, Pautrat A, Boullay P, Jung CU, Prellier W. Strong Magnetic Anisotropy of Epitaxial PrVO 3 Thin Films on SrTiO 3 Substrates with Different Orientations. ACS APPLIED MATERIALS & INTERFACES 2020; 12:35606-35613. [PMID: 32805796 DOI: 10.1021/acsami.0c07794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We have probed the structural and magnetic properties of PrVO3 (PVO) thin films grown on the (001)-, (110)-, and (111)-oriented SrTiO3 (STO) substrates. By changing the substrate orientation, the film out-of-plane orientation can be tuned to [110], [100]/[010], and [011]/[311], with different in-plane crystallographic variants. Accommodation of these variants on the different substrates implies different strain states, which have direct influence on the magnetic properties of PVO films. The magnetic moment of PVO films radically enhances from 0.4 μB/f.u. for STO(001) to 2.3 μB/f.u. for STO(111). While films on the (001)-oriented STO substrate display out-of-plane anisotropy, an in-plane anisotropy is observed for films grown on the (110)- and (111)-oriented STO substrates. In addition, a strong uniaxial magnetic anisotropy is also extracted for a partially relaxed film on the (110)-oriented STO substrate. Such findings can help oxide community for the better understanding of magnetic anisotropy in vanadate thin films, a subject that still suffer from significant lack of scientific investigations.
Collapse
Affiliation(s)
- Deepak Kumar
- Normandie Université, UNICAEN, ENSICAEN, Laboratoire CRISMAT, CNRS UMR 6508, Caen Cedex 4 F-14050, France
| | - Adrian David
- Normandie Université, UNICAEN, ENSICAEN, Laboratoire CRISMAT, CNRS UMR 6508, Caen Cedex 4 F-14050, France
| | - Arnaud Fouchet
- Normandie Université, UNICAEN, ENSICAEN, Laboratoire CRISMAT, CNRS UMR 6508, Caen Cedex 4 F-14050, France
| | - Alain Pautrat
- Normandie Université, UNICAEN, ENSICAEN, Laboratoire CRISMAT, CNRS UMR 6508, Caen Cedex 4 F-14050, France
| | - Philippe Boullay
- Normandie Université, UNICAEN, ENSICAEN, Laboratoire CRISMAT, CNRS UMR 6508, Caen Cedex 4 F-14050, France
| | - Chang Uk Jung
- Department of Physics, Oxide Research Center, Hankuk University of Foreign Studies, Yongin, Gyeonggi 17035, Korea
| | - Wilfrid Prellier
- Normandie Université, UNICAEN, ENSICAEN, Laboratoire CRISMAT, CNRS UMR 6508, Caen Cedex 4 F-14050, France
| |
Collapse
|
4
|
Varignon J, Bristowe NC, Bousquet E, Ghosez P. Magneto-electric multiferroics: designing new materials from first-principles calculations. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2019-0069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In parallel with the revival of interest for magneto-electric multiferroic materials in the beginning of the century, first-principles simulations have grown incredibly in efficiency during the last two decades. Density functional theory calculations, in particular, have so become a must-have tool for physicists and chemists in the multiferroic community. While these calculations were originally used to support and explain experimental behaviour, their interest has progressively moved to the design of novel magneto-electric multiferroic materials. In this article, we mainly focus on oxide perovskites, an important class of multifunctional material, and review some significant advances to which contributed first-principles calculations. We also briefly introduce the various theoretical developments that were at the core of all these advances.
Collapse
|
5
|
Steciuk G, David A, Petříček V, Palatinus L, Mercey B, Prellier W, Pautrat A, Boullay P. Precession electron diffraction tomography on twinned crystals: application to CaTiO 3 thin films. J Appl Crystallogr 2019. [DOI: 10.1107/s1600576719005569] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
Strain engineering via epitaxial thin-film synthesis is an efficient way to modify the crystal structure of a material in order to induce new features or improve existing properties. One of the challenges in this approach is to quantify structural changes occurring in these films. While X-ray diffraction is the most widely used technique for obtaining accurate structural information from bulk materials, severe limitations appear in the case of epitaxial thin films. This past decade, precession electron diffraction tomography has emerged as a relevant technique for the structural characterization of nano-sized materials. While its usefulness has already been demonstrated for solving the unknown structure of materials deposited in the form of thin films, the frequent existence of orientation variants within the film introduces a severe bias in the structure refinement, even when using the dynamical diffraction theory to calculate diffracted intensities. This is illustrated here using CaTiO3 films deposited on SrTiO3 substrates as a case study. By taking into account twinning in the structural analysis, it is shown that the structure of the CaTiO3 films can be refined with an accuracy comparable to that obtained by dynamical refinement from non-twinned data. The introduction of the possibility to handle twin data sets is undoubtedly a valuable add-on and, notably, paves the way for a successful use of precession electron diffraction tomography for accurate structural analyses of thin films.
Collapse
|
6
|
Yi SY, Song YG, Park JY, Suh JM, Kim GS, Shim YS, Yuk JM, Kim S, Jang HW, Ju BK, Kang CY. Morphological Evolution Induced through a Heterojunction of W-Decorated NiO Nanoigloos: Synergistic Effect on High-Performance Gas Sensors. ACS APPLIED MATERIALS & INTERFACES 2019; 11:7529-7538. [PMID: 30672291 DOI: 10.1021/acsami.8b18678] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Morphological evolution accompanying a surface roughening and preferred orientation is an effective way to realize a high-performance gas sensor because of its significant potential as a chemical catalyst through chemical potentials and atomic energy states. In this work, we investigated a heterojunction of double-side-W-decorated NiO nanoigloos fabricated through radio frequency sputtering and a soft-template method. Interestingly, a morphological evolution characterized by a pyramidal rough surface and the preferred orientation of the (111) plane was observed upon decorating the bare NiO nanoigloos with W. The underlying mechanism of the morphological evolution was precisely demonstrated based on the van der Drift competitive growth model originating from the oxygen transport and chemical strain in the lattice. The gas sensing properties of W-decorated NiO show an excellent NO2 response and selectivity when compared to other gases. In addition, high response stability was evaluated under interference gas and humidity conditions. The synergistic effects on the sensing performance were interpreted on the basis of the morphological evolution of W-decorated NiO nanoigloos.
Collapse
Affiliation(s)
- Seung Yeop Yi
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| | - Young Geun Song
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| | - Jae Yeol Park
- Department of Materials Science & Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Jun Min Suh
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | - Gwang Su Kim
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| | - Young-Seok Shim
- Department of Materials Science & Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Jong Min Yuk
- Department of Materials Science & Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Sangtae Kim
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | | | - Chong-Yun Kang
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| |
Collapse
|
7
|
Nair A, Wollstadt S, Witte R, Dasgupta S, Kehne P, Alff L, Komissinskiy P, Clemens O. Synthesis and characterisation of fluorinated epitaxial films of BaFeO2F: tailoring magnetic anisotropyviaa lowering of tetragonal distortion. RSC Adv 2019; 9:37136-37143. [PMID: 35542307 PMCID: PMC9075590 DOI: 10.1039/c9ra08039b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 10/25/2019] [Indexed: 01/11/2023] Open
Abstract
In this article, we report on the synthesis and characterisation of fluorinated epitaxial films of BaFeO2F via low-temperature fluorination of thin films of BaFeO2.5+d grown by pulsed laser deposition. Diffraction measurements show that fluoride incorporation only results in a contraction of the film perpendicular to the film surface, where clamping by the substrate is prohibitive for strong in-plane changes. The fluorinated films were found to be homogenous regarding the fluorine content over the whole film thickness, and can be considered as single crystal equivalents to the bulk phase BaFeO2F. Surprisingly, fluorination resulted in the change of the tetragonal distortion to a nearly cubic symmetry, which results in a lowering of anisotropic orientation of the magnetic moments of the antiferromagnetically ordered compound, confirmed by Mössbauer spectroscopy and magnetic studies. Fluorination of epitaxially grown thin films of BaFeO2.5 to BaFeO2F results in increased magnetic anisotropy.![]()
Collapse
Affiliation(s)
- Akash Nair
- Technische Universität Darmstadt
- Institute of Materials Science
- Materials Design by Synthesis Division
- 64287 Darmstadt
- Germany
| | - Stephan Wollstadt
- Technische Universität Darmstadt
- Institute of Materials Science
- Materials Design by Synthesis Division
- 64287 Darmstadt
- Germany
| | - Ralf Witte
- Karlsruhe Institute of Technology
- Institute of Nanotechnology
- 76344 Eggenstein Leopoldshafen
- Germany
| | - Supratik Dasgupta
- Technische Universität Darmstadt
- Institute of Materials Science
- Advanced Thin Film Technology Division
- 64287 Darmstadt
- Germany
| | - Philipp Kehne
- Technische Universität Darmstadt
- Institute of Materials Science
- Advanced Thin Film Technology Division
- 64287 Darmstadt
- Germany
| | - Lambert Alff
- Technische Universität Darmstadt
- Institute of Materials Science
- Advanced Thin Film Technology Division
- 64287 Darmstadt
- Germany
| | - Philipp Komissinskiy
- Technische Universität Darmstadt
- Institute of Materials Science
- Advanced Thin Film Technology Division
- 64287 Darmstadt
- Germany
| | - Oliver Clemens
- Technische Universität Darmstadt
- Institute of Materials Science
- Materials Design by Synthesis Division
- 64287 Darmstadt
- Germany
| |
Collapse
|