Project

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Strongly correlated metals beyond the Fermi liquid concept

Applicant Chang Johan Juul
Number 142434
Funding scheme Ambizione
Research institution Laboratoire de magnétisme quantique EPFL - SB - IPMC - LQM
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.09.2012 - 31.12.2014
Approved amount 310'600.00
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Keywords (3)

many-body physics; strong electron correlations; unconventional metals

Lay Summary (English)

Lead
Lay summary

Metals have played an important role in the past millenniums of human history. Periods like the bronze and iron age has been named after the metals used at the time.  Contemporary man's sword craft has evolved into a science of characterizing and understanding material properties. Harnessing semiconductors like silicon has enabled the creation of computers and revolutionized our daily life. The impact and importance of material research can therefore hardly be underestimated. In the past couple of decades, more than a handful of Nobel prizes have therefore been awarded to the discovery or understanding of metal physics such as superconductivity (1987, 2003), colossal magnetoresistance (2007), quantum hall effect (1998), and most recently the discovery of graphene (2010). Ever since 1956, Landau theory of Fermi liquids and its notion of quasiparticles have been founding our understanding of how electron interactions  affect the properties of a metal. However, in the past decades an increasing number of so-called strongly correlated electron systems that defy a description with the Fermi liquid concept of quasiparticles have been found. These non-Fermi liquid metals are unconventional in the sense that they do not form Fermi liquid quasiparticle and hence not Fermi surface is present. The observation of unconventional superconductivity and colossal magnetoresistance emerging from non-Fermi liquids have only enhanced the desire to understand strongly correlated electron systems that hold enormous technological potential for power transmission, data storage, or medical imaging.

This project is concerned with strongly correlated metals at and near the limit where the concept of conventional Fermi liquids is breaking down. A central goal of this project is to provide an experimental road map of how Fermi liquids are breaking down and being replaced by a non-Fermi liquid. A second and related objective is concerned with the unusual normal state of high-temperature cuprate superconductors. This research proposal is therefore divided into two sub-projects that will be executed in parallel. 


Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Competing charge, spin and superconducting orders in underdoped YBa2Cu3Oy
Huecker Markus (2014), Competing charge, spin and superconducting orders in underdoped YBa2Cu3Oy, in Physical Review B, 90, 054514.
Direct measurement of the upper critical field in cuprate superconductors
Grissonnanche G., Cyr-Choiniere O., Laliberte F., de Cotret S. Rene, Juneau-Fecteau A., Dufour-Beausejour S., Delage M. -E., LeBoeuf D., Chang J., Ramshaw B. J., Bonn D. A., Hardy W. N., Liang R., Adachi S., Hussey N. E., Vignolle B., Proust C., Sutherland M., Kraemer S., Park J. -H., Graf D., Doiron-Leyraud N., Taillefer Louis (2014), Direct measurement of the upper critical field in cuprate superconductors, in NATURE COMMUNICATIONS, 5, 3280.
Nodal Landau Fermi-Liquid Quasiparticles in Overdoped La1.77Sr0.23CuO4
Fatuzzo Claudia, Sassa Yasmine, Maansso Martin (2014), Nodal Landau Fermi-Liquid Quasiparticles in Overdoped La1.77Sr0.23CuO4, in Physical Review B, 89, 205104.
Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2-xSrxCuO4
Chang Johan Juul, Maansson M., Pailhès S., Claesson T., Lipscombe O. J., Hayden S. M., Patthey L., Tjernberg O., Mesot Joël (2013), Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2-xSrxCuO4, in Nature Communications, 4, 2559.
Glassy low-energy spin fluctuations and anisotropy gap in La 1.88Sr0.12CuO4
Rømer A. T., Chang Johan, Christensen Niels Bech, Andersen Brian Møller, Lefmann Kim, Mähler L., Gavilano Jorge L., Gilardi Raffaele, Niedermayer Ch, Rønnow Henrik Moodysson R, Schneidewind Astrid, Link Peter, Oda Migaku, Ido Masayuki, Momono Naoki, Mesot Joël (2013), Glassy low-energy spin fluctuations and anisotropy gap in La 1.88Sr0.12CuO4, in Physical Review B - Condensed Matter and Materials Physics, 87(14), 144513.
Hall, seebeck, and nernst coefficients of underdoped HgBa2CuO4+δ: Fermi-Surface reconstruction in an archetypal cuprate superconductor
Doiron-Leyraud Nicolas, Lepault Stéphane, Cyr-Choinière Olivier, Vignolle Baptiste, Grissonnanche G., Laliberté Francis, Chang Johan, Barišić Neven, Chan Mun K., Zhao Lijun, Ji Lu, Li Yuan, Greven Martin, Proust Cyril, Taillefer Louis (2013), Hall, seebeck, and nernst coefficients of underdoped HgBa2CuO4+δ: Fermi-Surface reconstruction in an archetypal cuprate superconductor, in Physical Review X, 3(2), 021019.
Inelastic x-ray study of phonon broadening and charge-density wave formation in ortho-{II}-ordered {YB}a_{2}Cu_{3}O_{6.54}
Blackburn E., Chang Johan Juul, Said A. H., Leu B. M., Liang Ruixing, Bonn D. A., Hardy W. N., Forgan E. M., Hayden S. M. (2013), Inelastic x-ray study of phonon broadening and charge-density wave formation in ortho-{II}-ordered {YB}a_{2}Cu_{3}O_{6.54}, in Physical Review B, 88(5), 056506.
X-Ray Diffraction Observations of a Charge-Density-Wave Order in Superconducting Ortho-II YBa_{2}Cu_{3}O_{6.54} Single Crystals in Zero Magnetic Field
Blackburn E., Chang Johan Juul, Hücker M., Holmes A. T., Christensen N. B., Liang Ruixing, Bonn D. A., Hardy W. N., Rütt U., Gutowski O., Zimmermann M. V., Forgan E. M., Hayden S. M. (2013), X-Ray Diffraction Observations of a Charge-Density-Wave Order in Superconducting Ortho-II YBa_{2}Cu_{3}O_{6.54} Single Crystals in Zero Magnetic Field, in Physical Review Letters, 110(13), 137004.
Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67
Chang Johan Juul, Blackburn E., Holmes A. T., Christensen N. B., Larsen J., Mesot J., Liang Ruixing, Bonn D. A., Hardy W. N., Watenphul A., Zimmermann M. V., Forgan E. M., Hayden S. M. (2012), Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67, in Nature Physics, 8(12), 871-876.

Collaboration

Group / person Country
Types of collaboration
Paul Scherrer Institute Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
UBC Vancouver Canada (North America)
- in-depth/constructive exchanges on approaches, methods or results
Birmingham University Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
KTH Stockholm Sweden (Europe)
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Super-Stripe workshop & School Individual talk Competition between superconductivity and charge order in YBCO 19.07.2014 Erice, Sicily, Italy Chang Johan Juul;
Strongly correlated electron systems (SCES) Individual talk Competition between superconductivity and charge order in YBCO 07.07.2014 Grenoble, France Chang Johan Juul;
Theoretical and Experimental Magnetism Meeting Individual talk Disentanglement of pseudogaps and charge stripe order in La1.6-xNd0.4SrxCuO4 02.07.2014 Oxford, Great Britain and Northern Ireland Chang Johan Juul;
Swiss Physical Society (SPS) meeting Individual talk Superconductivity & Quantum Criticality 30.06.2014 Fribourg, Switzerland Chang Johan Juul;
APS March meeting Individual talk Competition between superconductivity and charge order in YBCO via X-ray diffraction 03.03.2014 Denver-Colorado, United States of America Chang Johan Juul;
SPS meeting Individual talk Superconductivity & Quantum Criticality 03.10.2013 Linz, Austria Chang Johan Juul;
Superconductivity research advanced by new materials & spectroscopies Individual talk Superconductivity & quantum criticality 23.07.2013 Sendai, Japan, Japan Chang Johan Juul;
MaNEP meeting Poster Direct observation of charge-density-wave order in YBCO 24.06.2013 Les Diablerets, Switzerland, Switzerland Chang Johan Juul;
Kick-off meeting: Helmholtz International Beamline for Extreme Fields Individual talk Unconventional SC and CDW order in high magnetic fields 03.06.2013 Hamburg, Germany, Germany Chang Johan Juul;
Gordon conference on Superconductivity Poster Non-local quasiparticle excitations 12.05.2013 Les Diablerets, Switzerland, Switzerland Chang Johan Juul;


Communication with the public

Communication Title Media Place Year
Talks/events/exhibitions Robotics festival Western Switzerland 2014

Awards

Title Year
Bertaut-Prize 2013

Associated projects

Number Title Start Funding scheme
141962 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials 01.01.2013 Sinergia
155873 Quantum MAny-body Physics in Solids 01.08.2015 Temporary Backup Schemes
150573 Fluctuations of boson and fermion condensates 01.01.2015 SNSF Professorships
164013 Laser-heated Floating Zone Furnace for EPFL Crystal Growth Facility 01.11.2016 R'EQUIP

Abstract

Physicists have an exquisite understanding of how electrons behave in most solids - enabling them, for example, to harness the semiconducting properties of silicon to create the computer. A similar understanding has eluded scientist in the case of materials with strong electron correlations that hold enormous technological promise - for power transmission, levitating trains, magnetic medical imaging, wireless communications, data storage, and quantum computing. The complexity that makes these materials interesting for future technological applications is also what hinders quick progress towards a complete understanding. A significant amount of basic research is therefore needed before correlated electron technology can be realized. The aim of this experimental Ambizione project is to investigate emergent phenomena of complex materials with strong electron correlations. As a strategy, this research project aims to study materials that are on the border of the conventional understanding and where the system can be tuned in a controlled way from conventional to unconventional metallic states.This research proposal is divided into two sub-projects which will both be attacked using a combination of laboratory based experiments and large scale facilities such as the Swiss Light Source (SLS) at the Paul Scherrer Institut (PSI) in Switzerland.Sub-project A: Strongly correlated metals beyond the Landau theory of Fermi liquids.For the past half century, Landau theory of Fermi liquids and its notion of quasiparticles have founded our understanding of how electron interactions ?affect the properties of a metal. However, there are an increasing number of so-called strongly correlated electron systems that defies a description within the Fermi liquid concept of quasiparticles. These non-Fermi liquid metallic states have attracted enormous interest because of their interesting properties such as high-temperature superconductivity and colossal magnetoresistance. To date there is, however, no complete theory for these unconventional metals. Using angle resolved photoemission spectroscopy, this project aims to study experimentally how a non-Fermi liquid metal emerge out of a conventional Fermi liquid.Sub-project B: Spontaneously broken symmetries in high-temperature superconductors.High-temperature superconductivity in layered copper-oxide materials remains, since its discovery in 1986, one of the most important unsolved problems of condensed matter physics. Progress to understand these materials has been held back by a persistent uncertainty as to whether these oxides should be viewed as metals in the fundamental sense: materials with quasiparticle excitations. The metallic ground state from which superconductivity emerges can only be reached using high magnetic fields. A number of high-field experiments have provided a series of breakthroughs in the past five years. Transport measurements have shown the existence of a field-induced metallic state that is conventional. Recent NMR experiments are suggestive of a field-induced charge order that breaks rotational and translational symmetry is what lead to a recovery of a normal metallic state. Using a recently developed magnet technology, high-field diffraction experiments are planned are planned to explore these broken symmetries.
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