Project

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NMR/NQR studies of strongly correlated electron systems

Applicant Shiroka Toni
Number 127126
Funding scheme Project funding
Research institution Laboratorium für Festkörperphysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Condensed Matter Physics
Start/End 01.10.2009 - 30.09.2012
Approved amount 177'414.00
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Keywords (10)

Strongly correlated electron systems; Heavy fermion materials; 1D spin chains and spin ladders; Nuclear magnetic resonance; Quantum phase transitions; Bose Einstein condensation; Strongly-correlated electron systems; Magnetic resonance; Non-Fermi-liquid behaviour; Quantum criticality

Lay Summary (English)

Lead
Lay summary
The aim of the present project is to address, mainly through magnetic resonance techniques, but also through thermal and transport measurements, important aspects of electron correlations in solids. We will on one side investigate the interplay between magnetism and superconductivity in the proximity of a quantum critical point, and on the other side explore the physical phenomena unique to 1D systems. The investigation of many strongly correlated electron systems (SCES) is particularly attractive since their properties can be relatively easily tuned either by chemical doping, or by applying pressure or magnetic fields. In addition, the possibility of 1D systems to admit exact numerical solutions makes them unique laboratories where to test our current knowledge of condensed matter.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
A two-axis goniometer for low-temperature nuclear magnetic resonance measurements on single crystals
Shiroka T, Casola F, Mesot J, Bachmann W, Ott HR (2012), A two-axis goniometer for low-temperature nuclear magnetic resonance measurements on single crystals, in REVIEW OF SCIENTIFIC INSTRUMENTS, 83(9), 093901-1-093901-4.
Dimensional crossover of spin chains in a transverse staggered field: An NMR study
Casola F, Shiroka T, Glazkov V, Feiguin A, Dhalenne G, Revcolevschi A, Zheludev A, Ott HR, Mesot J (2012), Dimensional crossover of spin chains in a transverse staggered field: An NMR study, in PHYSICAL REVIEW B, 86(16), 165111-1-165111-13.
The zero-field magnetic ground state of EuC6 investigated by muon spectroscopy
Lamura G., Shiroka T., Cahen S., Rida H., Emery N., Marêché J.-F., Lagrange P., Hérold C. (2012), The zero-field magnetic ground state of EuC6 investigated by muon spectroscopy, in Carbon, 50(11), 3995-4001.
μSR studies of superconductivity in eutectically grown mixed ruthenates
Shiroka T., Fittipaldi R., Cuoco M., De Renzi R., Maeno Y., Lycett R. J., Ramos S., Forgan E. M., Baines C., Rost A., Granata V., Vecchione A. (2012), μSR studies of superconductivity in eutectically grown mixed ruthenates, in Physical Review B, 85(13), 134527.
Correlated Trends of Coexisting Magnetism and Superconductivity in Optimally Electron-Doped Oxypnictides
Sanna S., Carretta P., Bonfà P., Prando G., Allodi G., De Renzi R., Shiroka T., Lamura G., Martinelli A., Putti M. (2011), Correlated Trends of Coexisting Magnetism and Superconductivity in Optimally Electron-Doped Oxypnictides, in Physical Review Letters, 107(22), 227003.
Distribution of NMR Relaxations in a Random Heisenberg Chain
Shiroka T, Casola F, Glazkov V, Zheludev A, Prsa K, Ott HR, Mesot J (2011), Distribution of NMR Relaxations in a Random Heisenberg Chain, in PHYSICAL REVIEW LETTERS, 106(13), 137202-1-137202-4.
Long- to short-range magnetic order in fluorine-doped CeFeAsO
Shiroka T, Lamura G, Sanna S, Prando G, De Renzi R, Tropeano M, Cimberle MR, Martinelli A, Bernini C, Palenzona A, Fittipaldi R, Vecchione A, Carretta P, Siri AS, Ferdeghini C, Putti M (2011), Long- to short-range magnetic order in fluorine-doped CeFeAsO, in PHYSICAL REVIEW B, 84(19), 195123-1-195123-8.
μSR investigation of the intercalated graphite superconductor CaC6
Shiroka T, Lamura G, De Renzi R, Belli M, Emery N, Rida H, Cahen S, Marêché J-F, Lagrange P, Hérold C (2011), μSR investigation of the intercalated graphite superconductor CaC6, in New Journal of Physics, 13(1), 013038-013038.
Crystal growth and characterization of the dilutable frustrated spin-ladder compound Bi(Cu1-xZnx)(2)PO6
Wang S, Pomjakushina E, Shiroka T, Deng G, Nikseresht N, Ruegg C, Ronnow HM, Conder K (2010), Crystal growth and characterization of the dilutable frustrated spin-ladder compound Bi(Cu1-xZnx)(2)PO6, in JOURNAL OF CRYSTAL GROWTH, 313(1), 51-55.
Direct Observation of Impurity-Induced Magnetism in a Spin-1/2 Antiferromagnetic Heisenberg Two-Leg Spin Ladder
Casola F, Shiroka T, Wang S, Conder K, Pomjakushina E, Mesot J, Ott HR (2010), Direct Observation of Impurity-Induced Magnetism in a Spin-1/2 Antiferromagnetic Heisenberg Two-Leg Spin Ladder, in PHYSICAL REVIEW LETTERS, 105(6), 067203-1-067203-4.
Fullerenium salts: A new class of C60-based compounds
Ricco Mauro, Pontiroli Daniele, Mazzani Marcello, Gianferrari Fabio, Pagliari Massimo, Goffredi Angelo, Brunelli Michela, Zandomeneghi Giorgia, Meier Beat H., Shiroka Toni (2010), Fullerenium salts: A new class of C60-based compounds, in Journal of the American Chemical Society, 132(6), 2064-2068.
Magnetic-superconducting phase boundary of SmFeAsO(1−x)Fx studied via muon spin rotation: Unified behavior in a pnictide family
Sanna S., De Renzi R., Lamura G., Ferdeghini C., Palenzona A., Putti M., Tropeano M., Shiroka T. (2009), Magnetic-superconducting phase boundary of SmFeAsO(1−x)Fx studied via muon spin rotation: Unified behavior in a pnictide family, in Physical Review B, 80(5), 052503.

Collaboration

Group / person Country
Types of collaboration
Alexandre Revcolevschi, Université Paris-Sud XI France (Europe)
- Publication
Andrey Zheludev, ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Mladen Horvatic, Grenoble High Magnetic Field Laboratory France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Henrik Rønnow, EPFL, Lausanne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Vasiliy Glazkov, Kapitza Institute, Moscow Russia (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Adrian E. Feiguin, Northeastern University, Boston United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Joint European Magnetic Symposia (JEMS2012) Talk given at a conference Influence of frustration, disorder and high magnetic fields in a S=1/2 spin ladder 09.09.2012 Parma, Italy, Italy Shiroka Toni;
Deutsche Forschungsgemeinschaft (DFG) Summer School Individual talk Basics of muon spectroscopy: Probing matter with elementary particles 30.07.2012 Achatswies, Germany, Germany Shiroka Toni;
19th International Conference on Magnetism (ICM) Talk given at a conference Stability of incommensurate field-induced magnetic order upon site-disorder 08.07.2012 Busan, South Korea, Korean Republic (South Korea) Casola Francesco;
Swiss Physical Society (SPS) Annual Meeting Poster Frustration and disorder in a 1D spin ladder at high magnetic fields 21.06.2012 ETH, Zurich, Switzerland, Switzerland Shiroka Toni;
EuroMagnet II User Meeting Talk given at a conference Site-disorder and frustration: A case study of quantum domain walls in 1D magnetic insulators 13.06.2012 Grenoble, France, France Casola Francesco;
Strongly Correlated Electron Systems in High Magnetic Fields (SCEF 2012) Poster Disordered spin ladders at high magnetic fields: An NMR perspective 20.05.2012 Les Houches, France, France Shiroka Toni;
3rd International Conference on Superconductivity and Magnetism Talk given at a conference Competing orders in iron-based superconductors 29.04.2012 Istanbul, Turkey, Turkey Shiroka Toni;
Recent advances in broad-band solid-state NMR of correlated electronic systems Talk given at a conference Investigating random Heisenberg spin chains via nuclear magnetic resonance 04.09.2011 Trogir, Croatia, Croatia Shiroka Toni;
SCES 2011 - Commemorating 100 Years of Superconductivity Poster Field-induced incommensurate magnetic order in a frustrated Heisenberg ladder 29.08.2011 Cambridge, United Kingdom, Great Britain and Northern Ireland Casola Francesco;
26th International Conference on Low Temperature Physics (LT26) Talk given at a conference Low-temperature features of random Heisenberg spin chains 10.08.2011 Beijing, China, China Shiroka Toni;
5th European Conference on Neutron Scattering Talk given at a conference A direct observation of quasi-one-dimensional magnetism 17.07.2011 Prague, Czech Republik, Czech Republic Mesot Joël;
XV Training Course in the Physics of Strongly Correlated Systems Individual talk Experimental approaches to strong correlations 04.10.2010 Vietri sul Mare, Italy, Italy Mesot Joël;
15th Italian National Conference on Superconductivity (SATT15) Talk given at a conference Long vs. short range antiferromagnetic order in Ce-based pnictides 13.09.2010 Alghero, Italy, Italy Shiroka Toni;
Swiss Physical Society Meeting Talk given at a conference NMR study of doping effects in a single-crystal 2-leg Heisenberg spin ladder 21.06.2010 Basel, Switzerland, Switzerland Casola Francesco;
Perspectives in Highly Frustrated Magnetism Poster Impurity-induced magnetism in an S=1/2 AF Heisenberg 2-leg spin ladder: Insights from NMR 19.04.2010 Dresden, Germany, Germany Shiroka Toni;


Associated projects

Number Title Start Funding scheme
144519 Investigating quantum criticality via magnetic resonance 01.10.2012 Project funding
144519 Investigating quantum criticality via magnetic resonance 01.10.2012 Project funding
117817 Magnetic excitations in novel metal-organic quantum materials and molecular magnets 01.01.2008 Project funding
169455 Exotic matter and correlated quantum phenomena 01.01.2017 Project funding

Abstract

The aim of the present project is to address, mainly through magnetic resonance techniques, but also by other experimental methods, including thermal and transport measurements, the following aspects of electron correlation in solids:a. Non Fermi liquid behaviour in heavy electron systems:- Role of electron correlation in unconventional superconductivity- Coexistence/competition of magnetism and superconductivity close to a Quantum Critical Point (QCP)b. Properties of 1D systems in condensed matter:- Novel physical phenomena intrinsic to low dimensionalityThe investigation of these strongly correlated electron systems (SCES) is particularly attractive since their properties can be tuned relatively easily either by the use of chemical doping, or by applying currently accessible pressures or magnetic fields. In addition, the possibility of 1D systems to admit exact theoretical solutions makes them unique laboratories where to test our ultimate knowledge of condensed matter.The present project is characterized by the following key points:Focus: Our research will concentrate primarily on the NMR/NQR investigations of strongly correlated electron systems, with particular emphasis on 1D systems and 3D heavy-electron compounds, while seeking connections with the broader field of SCES.Novelty: We will search for interdependences between magnetism and superconductivity in the proximity of a quantum critical point in 3D systems, and will explore the interesting physical phenomena unique to 1D systems.Feasibility: Although we are going to investigate novel/challenging materials, the current project is well grounded on previous experience and relies on well mastered experimental techniques.Timing: The wide scope of the research will require a whole 3-year period. It will involve a post-doctorate researcher and a PhD student for its first and second parts, respectively.Teamwork: The proposed research will benefit from collaborations involving material and neutron scientists, condensed matter theorists and international collaborators. As past experience has shown, this type of approach is particularly useful in investigating complex systems and materials.Impact and Perspective: NMR measurements provide important information on the low-energy excitations of heavy-electron and 1D materials. On a longer term perspective our findings, together with those from complementary scattering experiments, will offer a better understanding of this class of condensed matter at low temperatures.
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