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Electron matter in unconventional layered superconductors

English title Electron matter in unconventional layered superconductors
Applicant Renner Christoph
Number 162517
Funding scheme Project funding (Div. I-III)
Research institution Département de Physique de la Matière Condensée Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Condensed Matter Physics
Start/End 01.11.2015 - 31.10.2018
Approved amount 751'114.00
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Keywords (11)

Atomic force microscopy; Correlated electrons; Superconductivity; Scanning tunneling microscopy; Intercalated graphite superconductors; Charge density waves; Vortex cores; Scanning tunneling spectroscopy; Transition metal dichalcogenides; Stripes; Cuprate high temperature superconductors

Lay Summary (French)

Lead
La supraconductivité non conventionnelle se développe souvent à proximité de phases électroniques ordonnées comme des ondes de densité de charge. L’objectif de ce projet est de caractériser ces phases électroniques complexes par microscopie et spectroscopie à sonde locale pour déterminer si ces phases complexes sont essentielles ou non à l’émergence de l’état supraconducteur.
Lay summary
Les efforts expérimentaux pour comprendre la supraconductivité à haute température se sont récemment portés sur la phase normale dans laquelle se développe la transition supraconductrice. Dans cette phase, les charges électroniques présentent une forte tendance à s’organiser dans l’espace réel pour former des phases électroniques ordonnées. Certaines expériences suggèrent que ces phases ordonnées sont en compétition avec la supraconductivité alors que d’autres suggèrent l’existence de paires préformées qui condensent dans un état cohérent à basse température. L’objectif de ce projet est de mieux comprendre ces phases électroniques ordonnées précédant l’état supraconducteur par microscopie et spectroscopie tunnel. La question centrale est de savoir si elles jouent un rôle clé dans l’apparition de l’état supraconducteur ou non. La spectroscopie tunnel des cœurs de lignes de flux magnétiques (les vortex) offrent une opportunité unique de démêler les caractéristiques spectrales liées à l’état supraconducteur de celles qui sont sans rapport. Elle permet un regard sur l’état normal à basse température, qui est un défi majeur.
Direct link to Lay Summary Last update: 06.10.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Energy-dependent spatial texturing of charge order in 1T−CuxTiSe2
Spera M., Scarfato A., Giannini E., Renner Ch. (2019), Energy-dependent spatial texturing of charge order in 1T−CuxTiSe2, in Physical Review B, 99(15), 155133-155133.
Scanning Tunneling Microscopy of an Air Sensitive Dichalcogenide Through an Encapsulating Layer
Martinez-Castro Jose, Mauro Diego, Pásztor Árpád, Gutiérrez-Lezama Ignacio, Scarfato Alessandro, Morpurgo Alberto F., Renner Christoph (2018), Scanning Tunneling Microscopy of an Air Sensitive Dichalcogenide Through an Encapsulating Layer, in Nano Letters, 18(11), 6696-6702.
Observation of Caroli–de Gennes–Matricon Vortex States in YBa2Cu3O7−δ
Berthod Christophe, Maggio-Aprile Ivan, Bruér Jens, Erb Andreas, Renner Christoph (2017), Observation of Caroli–de Gennes–Matricon Vortex States in YBa2Cu3O7−δ, in Physical Review Letters, 119(23), 237001-237001.
Note: Mechanical in situ exfoliation of van der Waals materials
Pasztor A., Scarfato A., Renner Ch. (2017), Note: Mechanical in situ exfoliation of van der Waals materials, in Review of Scientific Instruments, 88(7), 076104-1-076104-3.
Stripe and Short Range Order in the Charge Density Wave of 1T−CuxTiSe2
Novello A. M., Spera M., Scarfato A., Ubaldini A., Giannini E., Bowler D. R., Renner Ch. (2017), Stripe and Short Range Order in the Charge Density Wave of 1T−CuxTiSe2, in Physical Review Letters, 118(1), 017002-017002.
Dimensional crossover of the charge density wave transition in thin exfoliated VSe2
Árpád Pásztor, Scarfato Alessandro, Barreteau Céline, Giannini Enrico, Renner Christoph (2017), Dimensional crossover of the charge density wave transition in thin exfoliated VSe2, in 2D Materials, 4(4), 041005-041005.
Revisiting the vortex-core tunnelling spectroscopy in YBa2Cu3O7−δ
Bruér Jens, Maggio-Aprile Ivan, Jenkins Nathan, Ristić Zoran, Erb Andreas, Berthod Christophe, Fischer Øystein, Renner Christoph (2016), Revisiting the vortex-core tunnelling spectroscopy in YBa2Cu3O7−δ, in Nature Communications, 7(1), 11139-11139.
Scanning tunneling microscopy of the charge density wave in 1T-TiSe2 in the presence of single atom defects
Novello A. M., Hildebrand B., Scarfato A., Didiot C., Monney G., Ubaldini A., Berger H., Bowler D. R., Aebi P., Renner Ch. (2015), Scanning tunneling microscopy of the charge density wave in 1T-TiSe2 in the presence of single atom defects, in Physical Review B, 92(8), 081101-1-081101-4.

Collaboration

Group / person Country
Types of collaboration
Prof. Thierry Giamarchi and Dr. Christophe Berthod, University of Geneva Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Philipp Aebi, FRIMAT, University of Fribourg Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
G.Gu, Brookhaven National Laboratory United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
Prof. Andreas Erb, Walter Meissner Institute, Münich Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. David Bowler, London Centre for Nanotechnology, University College London Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Radovan Cerny, DQMP, University of geneva Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Enrico Giannini, DQMP, University of Geneva Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
M2S Talk given at a conference Conventional aspects of high temperature copper oxide superconductors 19.08.2018 Beijing, China Renner Christoph;
STSPM-7 LTSPM-1 Poster Scanning Tunneling Microscopy of encapsulated 2D materials 28.07.2018 Nijmegen, Netherlands Martinez Castro José;
12th CMCEE 2018 Talk given at a conference BCS fingerprints in the vortices of a high temperature copper oxide superconductor 22.07.2018 Singapore, Singapore Renner Christoph;
C. Fuerzas y Tunel 2018. Talk given at a conference Scanning Tunneling Microscopy of Encapsulated 2D Materials. 26.06.2018 Zaragoza, Spain Martinez Castro José;
Tsinghua Geneva Initiative Talk given at a conference Scanning probe microscopy: beyond atomic-scale surface topography 26.06.2018 Beijing, China Renner Christoph;
PSI - Symposium "Innovation and Creativity Talk given at a conference Scanning probe microscopy: beyond atomic-scale surface topography 08.06.2018 Zurich, Switzerland Renner Christoph;
MultiSuper 2018 Talk given at a conference Spatial and energy dependent texturing of the charge order in 1T-CuxTiSe2 14.05.2018 Trieste, Italy Spera Marcello;
Linné Colloquium Individual talk Conventional aspects of “unconventional” high temperature cuprate superconductors observed by scanning tunn 11.04.2018 Chalmers, Goeteborg, Sweden Renner Christoph;
Coherent Superconducting Hybrids and Related Materials Talk given at a conference Spatial and energy dependent texturing of the charge order in 1T-CuxTiSe2 26.03.2018 Les Arcs, France Spera Marcello;
APS March Meeting 2018 Talk given at a conference Energy dependent spatial texturing in the CDW of 1T-CuxTiSe2 05.03.2018 Los Angeles, United States of America Spera Marcello;
IFW colloquium Individual talk Conventional superfluid condensate observed by STM in an “unconventional” high temperature cuprate superconductor 07.12.2017 Dresden, Germany Renner Christoph;
MPI Seminar Individual talk Doping and thickness dependence of the commensurate cdw in transition metal dichalcogenides observed by stm. 07.12.2017 Dresden, Germany Renner Christoph;
Superconductivity in atomically thin materials and heterostructures Talk given at a conference CDW decoherence and thickness dependence in transition metal dichalcogenides 20.11.2017 Lugano, Switzerland Renner Christoph;
Topical Insights into Nanoscience using Scanning Probe Poster Scanning Tunneling Microscopy of Encapsulated 2D Materials 13.11.2017 Bad Honnef, Germany Martinez Castro José;
FisMat 2017 Talk given at a conference Energy dependent domain formation in the CDW phase of 1T-CuxTiSe2 01.10.2017 Trieste, Italy Spera Marcello;
Vortex X Talk given at a conference Energy dependent domain formation in the CDW phase of 1T-CuxTiSe2 09.09.2017 Rhodes, Greece Spera Marcello;
Electron Correlations in superconductors and nanostructures (ECSN-2017) Talk given at a conference Observation of Caroli–de Gennes–Matricon vortex core states in YBa2Cu3O7−δ 17.08.2017 Odessa, Ukraine Renner Christoph;
16th international conference on the formation of semiconductor interfaces Talk given at a conference Thickness dependence of the charge density wave order parameter in thin exfoliated 1T-VSe2 02.07.2017 Hanovre, Germany Renner Christoph;
Superstripes 2017 Talk given at a conference Conventional vortices in the high temperature superconductor YBa2Cu3O7−δ 05.06.2017 Ischia, Italy Renner Christoph;
Superstripes 2017 Talk given at a conference Remarkable energy dependent domain formation in the CDW of 1T-CuxTiSe2 04.06.2017 Ischia, Italy Spera Marcello;
Seminar HFML Individual talk Conventional vortices in unconventional superconductors 30.09.2016 Nijmegen, Netherlands Renner Christoph;
Swiss Workshop on Materials with Novel Electronic Properties Poster Impact of Cu doping on the CDW in TiSe2 06.07.2016 Les Diablerets, Switzerland Spera Marcello;
Superstripes 2016 Talk given at a conference Ubiquitous stripe charge order in low dimensional superconductors observed by STM 23.06.2016 Ischia, Italy Renner Christoph;
Spectroscopies in novel superconductors - SNS2016 Talk given at a conference New insight on the vortex core and charge order in YBCO 19.06.2016 Ludwigsburg, Germany Renner Christoph;
From solid state to biophysics VIII Talk given at a conference New insight on the vortex-core tunneling spectroscopy in YBa2Cu3O7−δ 05.06.2016 Dubrovnik, Croatia Renner Christoph;
COST MP1201 NanoSC Workshop Talk given at a conference Scanning tunnelling studies on the charge ordered states of superconducting CuxTiSe2 12.04.2016 Saas Fee, Switzerland Spera Marcello;
Max Planck Colloquium Individual talk Scannning probe study of charge order and superconductivity in high temperature superconductors 27.01.2016 Stuttgart, Germany Renner Christoph;
KAST Frontier Scientist Workshop Talk given at a conference New insight on the vortex-core tunneling spectroscopy in YBa2Cu3O7-d 19.01.2016 Stuttgart, Germany Renner Christoph;
Séminaire Individual talk Ordre de charge et supraconductivité vus par microscopie et spectroscopie tunnel 27.11.2015 Grenoble, France Renner Christoph;


Self-organised

Title Date Place
Swiss Workshop on Materials with Novel Electronic Properties 06.07.2016 Les Diablerets, Switzerland

Communication with the public

Communication Title Media Place Year
Talks/events/exhibitions Atomes dévoilés par microscopie en champ proche Western Switzerland 2017

Associated projects

Number Title Start Funding scheme
153123 Transport properties and electronic structure of one-dimensional electronic systems 01.09.2014 Project funding (Div. I-III)
144139 Ordered electronic phases in low dimensional superconductors 01.11.2012 Project funding (Div. I-III)
133777 Scanning probe microscopy and spectroscopy of nanoscale materials and devices 01.01.2011 R'EQUIP
182652 Electron matter in correlated electron systems 01.11.2018 Project funding (Div. I-III)

Abstract

Understanding and mastering high temperature superconductivity remains one of the mostexciting problems in contemporary solid state physics. This proposal aims to contribute tothe characterization and understanding of the distinctive pseudogap phase defining thenormal state of many unconventional layered superconductors. There is mounting evidencesfor charge ordering instabilities above the superconducting transition in cuprates and otherso-called high temperature superconductors. But the precise nature of this normal stateelectron matter that forms the breeding ground of superconductivity in these materials remainsthe subject of intense experimental and theoretical scrutiny.Recent results we have obtained on YBa2Cu3O7-d (Y-123) and 1T-CuxTiSe2 provide novel insightinto the charge ordered phases and their interplay with superconductivity. In Y-123,we find that the subgap states so far interpreted in terms of vortex core states are notbound to vortices. High resolution spectra reveal they are ubiquitous features of the tunnelingspectra measured with and without magnetic field. They could be spectroscopic signaturesof the charge ordering observed by other techniques, a hypothesis we want to explorein this proposal. In 1T-CuxTiSe2, we find evidences for a charge stripe instability when x>0. Here, the question is whether this lower symmetry ordered phase plays a role in the superconductingphase transition. These yet unpublished results prompt us to propose a newstudy of the pseudogap phase and associated electron matter by means of scanning probemicroscopy and spectroscopy. We shall take advantage of recent progress in material synthesisand scanning probe instrumentation to study the unconventional (ordered) normalstate above Tc as well as inside vortex cores below Tc. We are proposing new experimentalprotocols, investigating adjacent terraces to look for chirality and charge density wave(CDW) correlations along the c-axis, combining tunneling and point contact spectroscopy todelineate phase coherent and quasiparticle spectral features, and developing new instrumentationcapabilities such as applying tuneable strain to the sample.HTS cuprates have been the subject of sustained studies for nearly thirty years. But a generalconsensus on the mechanism of superconductivity and the nature of the normal state isstill lacking. YBaCu3O7-d and 1T-CuxTiSe2 share analogous phase diagrams where superconductivitydevelops on the vanishing edge of some ordered electron matter phase with arange of similar questions still to be answered. For example what drives the charge orderinginstabilities, what is the nature and driving mechanisms of the CDW, stripes and nematicphases; are they chiral; what is the nature of the normal state gap; does it compete, cooperateor simply coexist with superconductivity? We shall contribute to these issues in a parallelstudy of HTS cuprates and low temperature layered superconductors by STM and AFM,two techniques with unique capabilities to explore the spectral signatures and real spacetextures of the normal state electron matter. The likely outcome is not only a better understandingof the superconducting phase transition
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