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ARPES studies of iron-pnictide and BKBO superconductors

English title ARPES studies of iron-pnictide and BKBO superconductors
Applicant Shi Ming
Number 159678
Funding scheme Project funding (Div. I-III)
Research institution Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Condensed Matter Physics
Start/End 01.05.2016 - 30.04.2019
Approved amount 230'000.00
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Keywords (10)

electron correlation effects; BKBO; superconductor order; iron-pnictides; ARPES; topological insulator; charge density wave; electronic structure; high-temperature superconductors; antiferromagnetic

Lay Summary (German)

Lead
Einige ungewöhnliche Materialien zeigen Supraleitung bei relativ hohen Temperaturen. In diesem Projekt versuchen wir, diesem Rätsel auf die Spur zu kommen, indem wir zwei Klassen von Supraleitern mit winkelaufgelösten Photoemissionsspektroskopie erforschen.
Lay summary

In einem Supraleiter fliesst elektrischer Strom ohne Widerstand. Dieses Verhalten ist in vielen wichtigen Anwendungsfällen nützlich, von ultraempfindlichen Sensoren bis MRT-Geräten. Normalerweise wird Supraleitfähigkeit in Metallen bei extrem tiefen Temperaturen nahe des Siedepunkts von flüssigem Helium gefunden. Einige ungewöhnliche Materialien zeigen jedoch Supraleitung bei relativ hohen Temperaturen, bspw. nahe des Siedepunkts von flüssigem Stickstoff. Trotz intensiver Forschung in den letzten drei Jahrzehnten bleibt der genaue Ursprung dieser sogenannten Hochtemperatursupraleitung unklar.

Wir planen, diese Materialen mit der komplexen Technik der winkelaufgelösten Photoemissionsspektroskopie (ARPES) zu untersuchen, die auf Einsteins Erklärung des Prinzip des Photoeffekts basiert. Diese Technik setzt voraus, dass die Proben extrem saubere und glatte Oberflächen aufweisen. Im Fall von Bismut-Oxiden müssen die Proben direkt im Messsystem mittels gepulster Laser-Deposition hergestellt werden. Nur dank der besonderen Kombination von Instrumenten und Fähigkeiten der Schweizer Lichtquelle am Paul Scherrer Institut ist dieses komplexe Projekt überhaupt möglich.

Die ARPES Spektren spiegeln direkt die Zustandsdichte der Elektronen im quantenmechanischen Impuls-Raum wider. Da Supraleitfähigkeit ein reines Quanten-Phänomenon ist, ist ARPES ein ideales Werkzeug um sie zu erforschen. Die Spektren enthüllen Informationen über die verschiedenen Wechselwirkungen der Elektronen, die die Supraleitfähigkeit sowohl unterstützen, als auch unterdrücken können. Wir schlagen vor, diese neuen, unkonventionellen Supraleiter mittels ARPES zu untersuchen, deren elektronische Struktur mit denjenigen von anderen Hochtemperatursupraleitern zu vergleichen, und dadurch die Faktoren besser zu verstehen, die diesem Phänomen zugrunde liegen.

 

 

 

Direct link to Lay Summary Last update: 25.03.2016

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Collaboration

Group / person Country
Types of collaboration
Prof. Z. Fang and Prof. X. Dai/Institute of Physics, CAS China (Asia)
- in-depth/constructive exchanges on approaches, methods or results
Prof. Steven Johnston United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. E. Pomjakushina and Prof. K. Conder/Paul Scherrer Institute Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Prof. D. van der Marel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
V. N. Strocov & T. Schmitt/SLS/Paul Scherrer Inst Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Prof. S. Biermann group/ Centre de Physique Theorique, Ecole Polytechnique France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Dr. M. Müller Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. C. Jin, Prof. G. –F. Chen and Prof. Y. –G. Shi groups/Institute of Physics, CAS China (Asia)
- in-depth/constructive exchanges on approaches, methods or results
Dr. E. Razzoli & Prof. P. Aebi / University of Fribourg Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
J. H. Dil/EPF Lausanne & Paul Scherrer Institut Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
J. Mesot/Paul Scherrer Institut & EPF Lausanne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Prof. H. Ding, groups/ the Institute of Physics, CAS China (Asia)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Beijing Forum of High-Temperature Superconduvtivity Talk given at a conference Iron-Selenide Phenomenology in Superconductiong Pr4Fe2As2Te0.88O4 27.05.2019 Zhang Ye, China, China Shi Ming;
Seminar at Institute for Solid State Physics, University of Tokyo Individual talk In situ ARPES studies of the ‘bismuthate’ family of superconductors 11.03.2019 Tokyo, Japan Plumb Nicholas;
23rd Hiroshima International Symposium on Synchrotron Radiation Talk given at a conference In situ ARPES studies of the ‘bismuthate’ family of superconductors 07.03.2019 Hiroshima, Japan Plumb Nicholas;
New Generation in Strongly Correlated Electrons Systems Talk given at a conference Phase mixture and pseudogap behavior in the bismuthate high Tc superconductors 03.09.2018 San Sebastian, Spain Naamneh Muntaser;
2018 SPS Annual Meeting Talk given at a conference Cooling a polaronic liquid: Phase mixture and pseudogap-like spectra in superconducting Ba1-xKxBiO3 28.08.2018 Lausanne, Switzerland Naamneh Muntaser;
Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-2018) Talk given at a conference A New Look at an Old Puzzle: ARPES on Ba1-xKxBiO3 19.08.2018 Beijing, China Plumb Nicholas;
12th International Conference on Materials and Magnetism of Superconductivity and High Temperature Superconductors (M2S-2018) Talk given at a conference • The electronic structure of 112 Fe-pnictide superconductor probed by ARPES 19.08.2018 Beijing, China Shi Ming;
The 6th International Conference on Superconductivity and Magnetism- ICSM2018 Talk given at a conference The Electronic Structure of 112 Fe-pnictide superconductors probed by Angle-resolved Photoemission Spectroscopy 29.04.2018 Antalya, Turkey Shi Ming;
2018 APS March Meeting Talk given at a conference Electron-phonon coupling and polaronic effects in the bismuthate high-Tc superconductors 05.03.2018 Los Angeles, United States of America Plumb Nicholas;
Workshop on Scientific Opportunities with Electron Spectroscopy and RIXS Talk given at a conference In Situ Spectroscopic Studies of Bismuth Oxide Films: A superconductor family that ARPES forgot 18.10.2017 Berlin, Germany Plumb Nicholas;
The 2017 E-MRS Fall Meeting Talk given at a conference The Electronic Structure of 112 Fe-pnictide superconductors probed by Angle-resolved Photoemission Spectroscopy 18.09.2017 Warsaw, Poland Shi Ming;
The annual Fall Meeting of Chinese Physics Society Talk given at a conference Electron-electron correlation in iron-pnictides, revealed by angle-resolved photoemission spectroscopy (ARPES) 07.09.2017 Chengdu, China Shi Ming;
2017 Joint Annual Meeting of SPS and ÖPG Talk given at a conference A Different Route to Unconventional Superconductivity: New Spectroscopy on Bismuth Oxides 23.08.2017 Geneva, Switzerland Plumb Nicholas;
Symposium on Quantum Matter, International Conference on Statistical Physics Talk given at a conference A Different Route to Unconventional Superconductivity: New Spectroscopy on Bismuth Oxides 10.07.2017 Corfu, Greece Plumb Nicholas;
International workshop on strong correlations and angle-resolved photoemission spectroscopy (CORPES17) Talk given at a conference Robustness of the insulating band structure of BaBiO3 films in the ultrathin limit 02.07.2017 Hiroshima, Japan Naamneh Muntaser;
Superstripes 2017 Talk given at a conference Electron-electron correlation in iron-pnictides, revealed by ARPES 04.06.2017 Ischia, Italy Shi Ming;
2017 APS March Meeting Talk given at a conference Robustness of the insulating band structure of BaBiO3 films in the ultrathin limit 13.03.2017 New Orleans, United States of America Naamneh Muntaser;
32nd Workshop on Novel Materials and Superconductivity (hosted by Technische Universität Wien) Talk given at a conference Electronic Structure of BaBiO3: A Different Paradigm for Insulating Parent Compounds of HTSCs 13.02.2017 Obertraun, Austria Plumb Nicholas;
2016 SPS Annual Meeting Talk given at a conference ARPES study of the exotic insulating phase in the high-Tc superconductor parent compound BaBiO3 23.08.2016 Lugano, Switzerland Plumb Nicholas;
Superstripes 2016 Talk given at a conference Camelback-shaped Band Reconciles Heavy-electron Behavior with Weak Electronic Coulomb Correlations in Superconducting TlNi2Se2 23.06.2016 Ischia, Italy Shi Ming;
EMN Prague Meeting Talk given at a conference Electronic Correlation Effects in Iron-pnictides: Studied by ARPES 21.06.2016 Prague, Czech Republic Shi Ming;


Associated projects

Number Title Start Funding scheme
164016 High-performance and low-temperature angle-resolved photoemission spectroscopy station (ARPES) 01.08.2016 R'EQUIP
137783 ARPES Studies of 1111-type Fe-pnictide high-temperature superconductors 01.09.2012 Project funding (Div. I-III)

Abstract

Here we propose to investigate the electronic properties of iron-pnictide and Ba1-xKxBiO3 (BKBO) superconductors using angle-resolved photoemission spectroscopy (ARPES), The focuses will be,1.Unveil the electronic structure and superconducting gap amplitude as a function of crystal-momentum for the newly discovered 112 iron-pnictide superconductors (e.g. Ca1-xLaxFeAs2). This compound consists of alternately stacked FeAs and CaAs layers, both form energy bands crossing chemical level, which is unique comparing to all other iron-pnictides. This study would allow us to draw important conclusions about the in-plane and the out-of-plane pairing symmetry in iron-pnictides to test various proposals of the pairing mechanism.2.Study the correlation effects within selected families of iron-pnictides using ARPES, supported by dynamical mean-field theory (DMFT) calculations. The occurrence of high-Tc superconductivity in the iron pnictides puts a spotlight on the relevance of correlation effects in these materials. In this investigation we would like to address the puzzling question of the physical origin of the electronic correlations in these multiorbital metallic materials in AFM and superconducting phases - e.g. whether the intra-atomic exchange (Hund’s coupling) is essential for the correlation effects.3.Reveal the electronic properties and spectral function of single crystal BKBO films. BKBO is the first copper-free oxide superconductor with Tc > 30 K with superconductivity appears adjacent to CDW phase. This study will not only allow us to uncover k-resolved electronic properties which have never been published so far, but also help to better understand the interactions at the origin of high temperature superconductivity and possibly unveiling a new route to realizing technologically valuable low-dimensional metallic states endowed with exotic properties.The postdoc associated with this project will pursue the activities in the excellent scientific environment at Swiss Light Source, and in particular will work closely with the applicants of the proposal. The proposed activities could be adjusted depending on new developments in the field, and the discovery of new materials which are relevant to the line of research in this proposal.
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