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Pavlov DP, Zagidullin RR, Mukhortov VM, Kabanov VV, Adachi T, Kawamata T, Koike Y, Mamin RF. Fabrication of High-Temperature Quasi-Two-Dimensional Superconductors at the Interface of a Ferroelectric Ba_{0.8}Sr_{0.2}TiO_{3} Film and an Insulating Parent Compound of La_{2}CuO_{4}. PHYSICAL REVIEW LETTERS 2019; 122:237001. [PMID: 31298885 DOI: 10.1103/physrevlett.122.237001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 01/29/2019] [Indexed: 06/10/2023]
Abstract
We report the first observation of superconductivity in a heterostructure consisting of an insulating ferroelectric film (Ba_{0.8}Sr_{0.2}TiO_{3}) grown on an insulating parent compound of La_{2}CuO_{4} with [001] orientation. The heterostructure was prepared by magnetron sputtering on a nonatomically flat surface with inhomogeneities of the order of 1-2 nm. The measured superconducting transition temperature T_{c} is about 30 K. We have shown that superconductivity is confined near the interface region. Application of a weak magnetic field perpendicular to the interface leads to the appearance of the finite resistance. That confirms the quasi-two-dimensional nature of the superconductive state. The proposed concept promises ferroelectrically controlled interface superconductivity which offers the possibility of novel design of electronic devices.
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Affiliation(s)
- Dmitrii P Pavlov
- Zavoisky Physical-Technical Institute, FRC KazanSC of RAS, 420029 Kazan, Russia
| | - Rustem R Zagidullin
- Zavoisky Physical-Technical Institute, FRC KazanSC of RAS, 420029 Kazan, Russia
| | | | - Viktor V Kabanov
- Zavoisky Physical-Technical Institute, FRC KazanSC of RAS, 420029 Kazan, Russia
- Department for Complex Matter, Jozef Stefan Institute, 1000 Ljubljana, Slovenia
| | - Tadashi Adachi
- Department of Engineering and Applied Sciences, Sophia University, 102-8554 Tokyo, Japan
| | - Takayuki Kawamata
- Department of Applied Physics, Tohoku University, 980-8579 Sendai, Japan
| | - Yoji Koike
- Department of Applied Physics, Tohoku University, 980-8579 Sendai, Japan
| | - Rinat F Mamin
- Zavoisky Physical-Technical Institute, FRC KazanSC of RAS, 420029 Kazan, Russia
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2
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Luo X, Tseng LT, Wang Y, Bao N, Lu Z, Ding X, Zheng R, Du Y, Huang K, Shu L, Suter A, Lee WT, Liu R, Ding J, Suzuki K, Prokscha T, Morenzoni E, Yi JB. Intrinsic or Interface Clustering-Induced Ferromagnetism in Fe-Doped In 2O 3-Diluted Magnetic Semiconductors. ACS APPLIED MATERIALS & INTERFACES 2018; 10:22372-22380. [PMID: 29893112 DOI: 10.1021/acsami.8b04046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Five percent Fe-doped In2O3 films were deposited using a pulsed laser deposition system. X-ray diffraction and transmission electron microscopy analysis show that the films deposited under oxygen partial pressures of 10-3 and 10-5 Torr are uniform without clusters or secondary phases. However, the film deposited under 10-7 Torr has a Fe-rich phase at the interface. Magnetic measurements demonstrate that the magnetization of the films increases with decreasing oxygen partial pressure. Muon spin relaxation (μSR) analysis indicates that the volume fractions of the ferromagnetic phases in PO2 = 10-3, 10-5, and 10-7 Torr-deposited samples are 23, 49, and 68%, respectively, suggesting that clusters or secondary phases may not be the origin of the ferromagnetism and that the ferromagnetism is not carrier-mediated. We propose that the formation of magnetic bound polarons is the origin of the ferromagnetism. In addition, both μSR and polarized neutron scattering demonstrate that the Fe-rich phase at the interface has a lower magnetization compared to the uniformly distributed phases.
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Affiliation(s)
- Xi Luo
- School of Materials Science and Engineering , UNSW , Kensington , NSW 2052 , Australia
| | - Li-Ting Tseng
- School of Materials Science and Engineering , UNSW , Kensington , NSW 2052 , Australia
| | - Yiren Wang
- School of Materials Science and Engineering , UNSW , Kensington , NSW 2052 , Australia
| | - Nina Bao
- Department of Materials Science and Engineering , National University of Singapore , Singapore 119260
| | - Zunming Lu
- School of Physics , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Xiang Ding
- School of Materials Science and Engineering , UNSW , Kensington , NSW 2052 , Australia
| | - Rongkun Zheng
- School of Physics , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Yonghua Du
- Institute of Chemical and Engineering Science , Agency for Science, Technology and Research (A*STAR) , 1 Pesek Road , Jurong Island, Singapore 627833
| | - Kevin Huang
- State Key Laboratory of Surface Physics, Department of Physics , Fudan University , Shanghai 200433 , China
| | - Lei Shu
- State Key Laboratory of Surface Physics, Department of Physics , Fudan University , Shanghai 200433 , China
| | - Andreas Suter
- Laboratory for Muon Spin Spectroscopy , Paul Scherrer Institute , Villigen 5232 , Switzerland
| | - Wai Tung Lee
- Bragg institute , ANSTO , New Illawarra Road, Lucas Heithers , NSW 2234 , Australia
| | - Rong Liu
- SIMS Facility, Office of the Deputy-Vice Chancellor (Research and Development) , Western Sydney University , Locked Bag 1797 , Penrith , NSW 2751 , Australia
| | - Jun Ding
- Department of Materials Science and Engineering , National University of Singapore , Singapore 119260
| | - Kiyonori Suzuki
- Department of Materials Science and Engineering , Monash University , Clayton , Victoria 3800 , Australia
| | - Thomas Prokscha
- Laboratory for Muon Spin Spectroscopy , Paul Scherrer Institute , Villigen 5232 , Switzerland
| | - Elvezio Morenzoni
- Laboratory for Muon Spin Spectroscopy , Paul Scherrer Institute , Villigen 5232 , Switzerland
| | - Jia Bao Yi
- Global Innovative Centre for Advanced Nanomaterials, School of Engineering , The University of Newcastle , Callaghan , NSW 2308 , Australia
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Suyolcu YE, Wang Y, Baiutti F, Al-Temimy A, Gregori G, Cristiani G, Sigle W, Maier J, van Aken PA, Logvenov G. Dopant size effects on novel functionalities: High-temperature interfacial superconductivity. Sci Rep 2017; 7:453. [PMID: 28352070 PMCID: PMC5428683 DOI: 10.1038/s41598-017-00539-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 02/28/2017] [Indexed: 12/03/2022] Open
Abstract
Among the range of complex interactions, especially at the interfaces of epitaxial oxide systems, contributing to the occurrence of intriguing effects, a predominant role is played by the local structural parameters. In this study, oxide molecular beam epitaxy grown lanthanum cuprate-based bilayers (consisting of a metallic (M) and an insulating phase (I)), in which high-temperature superconductivity arises as a consequence of interface effects, are considered. With the aim of assessing the role of the dopant size on local crystal structure and chemistry, and on the interface functionalities, different dopants (Ca2+, Sr2+ and, Ba2+) are employed in the M-phase, and the M–I bilayers are investigated by complementary techniques, including spherical-aberration-corrected scanning transmission electron microscopy. A series of exciting outcomes are found: (i) the average out-of-plane lattice parameter of the bilayers is linearly dependent on the dopant ion size, (ii) each dopant redistributes at the interface with a characteristic diffusion length, and (iii) the superconductivity properties are highly dependent on the dopant of choice. Hence, this study highlights the profound impact of the dopant size and related interface chemistry on the functionalities of superconducting oxide systems.
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Affiliation(s)
- Y Eren Suyolcu
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.
| | - Yi Wang
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany
| | - Federico Baiutti
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany
| | - Ameer Al-Temimy
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.,Al-Nahrain Nanorenewable Energy Research Center, Al-Nahrain University, Baghdad, Iraq
| | - Giuliano Gregori
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany
| | - Georg Cristiani
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany
| | - Wilfried Sigle
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany
| | - Joachim Maier
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany
| | - Peter A van Aken
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany
| | - Gennady Logvenov
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany
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4
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Saadaoui H, Luo X, Salman Z, Cui XY, Bao NN, Bao P, Zheng RK, Tseng LT, Du YH, Prokscha T, Suter A, Liu T, Wang YR, Li S, Ding J, Ringer SP, Morenzoni E, Yi JB. Intrinsic Ferromagnetism in the Diluted Magnetic Semiconductor Co:TiO_{2}. PHYSICAL REVIEW LETTERS 2016; 117:227202. [PMID: 27925730 DOI: 10.1103/physrevlett.117.227202] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Indexed: 06/06/2023]
Abstract
Here we present a study of magnetism in Co_{0.05}Ti_{0.95}O_{2-δ} anatase films grown by pulsed laser deposition under a variety of oxygen partial pressures and deposition rates. Energy-dispersive spectrometry and transmission electron microscopy analyses indicate that a high deposition rate leads to a homogeneous microstructure, while a very low rate or postannealing results in cobalt clustering. Depth resolved low-energy muon spin rotation experiments show that films grown at a low oxygen partial pressure (≈10^{-6} torr) with a uniform structure are fully magnetic, indicating intrinsic ferromagnetism. First principles calculations identify the beneficial role of low oxygen partial pressure in the realization of uniform carrier-mediated ferromagnetism. This work demonstrates that Co:TiO_{2} is an intrinsic diluted magnetic semiconductor.
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Affiliation(s)
- H Saadaoui
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - X Luo
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
| | - Z Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - X Y Cui
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - N N Bao
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore
| | - P Bao
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - R K Zheng
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - L T Tseng
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
| | - Y H Du
- Institute of Chemical and Engineering Science, Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, 627833, Singapore
| | - T Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - A Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - T Liu
- ANKA, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Y R Wang
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
| | - S Li
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
| | - J Ding
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore
| | - S P Ringer
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
- The Australian Institute for Nanoscale Science and Technology, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - E Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - J B Yi
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
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5
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Saadaoui H, Salman Z, Luetkens H, Prokscha T, Suter A, MacFarlane WA, Jiang Y, Jin K, Greene RL, Morenzoni E, Kiefl RF. The phase diagram of electron-doped La(2-x)Ce(x)CuO(4-δ). Nat Commun 2015; 6:6041. [PMID: 25608106 DOI: 10.1038/ncomms7041] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 12/05/2014] [Indexed: 11/09/2022] Open
Abstract
Superconductivity is a striking example of a quantum phenomenon in which electrons move coherently over macroscopic distances without scattering. The high-temperature superconducting oxides (cuprates) are the most studied class of superconductors, composed of two-dimensional CuO2 planes separated by other layers that control the electron concentration in the planes. A key unresolved issue in cuprates is the relationship between superconductivity and magnetism. Here we report a sharp phase boundary of static three-dimensional magnetic order in the electron-doped superconductor La(2-x)Ce(x)CuO(4-δ), where small changes in doping or depth from the surface switch the material from superconducting to magnetic. Using low-energy spin-polarized muons, we find that static magnetism disappears close to where superconductivity begins and well below the doping level at which dramatic changes in the transport properties are reported. These results indicate a higher degree of symmetry between the electron and hole-doped cuprates than previously thought.
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Affiliation(s)
- H Saadaoui
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Z Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - T Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - A Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - W A MacFarlane
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Y Jiang
- Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA
| | - K Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - R L Greene
- Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA
| | - E Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - R F Kiefl
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
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6
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Liu J, Kargarian M, Kareev M, Gray B, Ryan PJ, Cruz A, Tahir N, Chuang YD, Guo J, Rondinelli JM, Freeland JW, Fiete GA, Chakhalian J. Heterointerface engineered electronic and magnetic phases of NdNiO3 thin films. Nat Commun 2013; 4:2714. [DOI: 10.1038/ncomms3714] [Citation(s) in RCA: 146] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Accepted: 10/04/2013] [Indexed: 11/09/2022] Open
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7
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Dean MPM, Springell RS, Monney C, Zhou KJ, Pereiro J, Božović I, Dalla Piazza B, Rønnow HM, Morenzoni E, van den Brink J, Schmitt T, Hill JP. Spin excitations in a single La2CuO4 layer. NATURE MATERIALS 2012; 11:850-854. [PMID: 22941330 DOI: 10.1038/nmat3409] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 07/26/2012] [Indexed: 05/27/2023]
Abstract
Cuprates and other high-temperature superconductors consist of two-dimensional layers that are crucial to their properties. The dynamics of the quantum spins in these layers lie at the heart of the mystery of the cuprates. In bulk cuprates such as La(2)CuO(4), the presence of a weak coupling between the two-dimensional layers stabilizes a three-dimensional magnetic order up to high temperatures. In a truly two-dimensional system however, thermal spin fluctuations melt long-range order at any finite temperature. Here, we measure the spin response of isolated layers of La(2)CuO(4) that are only one-unit-cell-thick. We show that coherent magnetic excitations, magnons, known from the bulk order, persist even in a single layer of La(2)CuO(4), with no evidence for more complex correlations such as resonating valence bond correlations. These magnons are, therefore, well described by spin-wave theory (SWT). On the other hand, we also observe a high-energy magnetic continuum in the isotropic magnetic response that is not well described by two-magnon SWT, or indeed any existing theories.
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Affiliation(s)
- M P M Dean
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA.
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