Project

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Interplay of Magnetism and Superconductivity in Unconventional Superconductors

English title Interplay of Magnetism and Superconductivity in Unconventional Superconductors
Applicant Gavilano Jorge Luis
Number 122054
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 01.04.2009 - 31.03.2012
Approved amount 327'570.00
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Keywords (12)

Unconventional Superconductivity; Neutron Scattering; SANS; Vortex lattice; Magnetism; condensed matter; superconductivity; unconventional superconductors; heavy fermions; muSR; solid state physics; strongly correlated electron systems

Lay Summary (English)

Lead
Lay summary
Using neutron scattering and muon spin rotation (muSR) techniques we plan to experimentally study the interplay of magnetism and superconductivity in selected unconventional superconductors. Of particular interest in this project are phase transitions between different superconducting states, particularly those that are related to changes in spatial structures of the superconducting state with magnetic field. Examples of such structures include vortex lattices that appear in type II superconductors in the presence of external magnetic fields and, the recently found Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in Pauli-limited type II superconductors, characterized by a spatial modulation of the superconducting order parameter. Also of interest are novel magnetic fluctuations and long-range magnetic order in the superconducting phase.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Direct Observation of the Quantum Critical Point in Heavy Fermion CeRhSi3
Egetenmeyer N, Gavilano JL, Maisuradze A, Gerber S, MacLaughlin DE, Seyfarth G, Andreica D, Desilets-Benoit A, Bianchi AD, Baines C, Khasanov R, Fisk Z, Kenzelmann M. (2012), Direct Observation of the Quantum Critical Point in Heavy Fermion CeRhSi3, in PHYSICAL REVIEW LETTERS, 108(17), 177204-1-177204-5.
Spin Density Wave Induced Disordering of the Vortex Lattice in Superconducting La2-xSrxCu4
Chang J, White J. S., Laver M., Bowel C. J., Brown S. P., Holmes A. T., Maecheler L., Sträsle S., Gilardi L., Gerber S., Kurosowa N., Momono N., Oda M., Ido M., Lipscombe O. J., Hayden S. M., Dewhurst C. D., Vavrin R., Gavilano J. L., Kohlbrecher J., Forgan E. M., Mesot J. (2012), Spin Density Wave Induced Disordering of the Vortex Lattice in Superconducting La2-xSrxCu4, in Physical Review B, 85(13), 134520-1-134520-7.
Vortex Lattice Studies in CeCoIn5 with H Perpendicular to c
Das P., White J. S., Holmes A. T., Gerber S., Forgan E. M., Bianchi A. D., Kenzelmann M., Zolliker M., Gavilano J. L., Bauer E. D., Sarrao J. L., Petrovic C., Eskildsen M. R. (2012), Vortex Lattice Studies in CeCoIn5 with H Perpendicular to c, in Physical Review Letters, 108(8), 087002-1-087002-5.
First-order reorientation transition of the flux-line lattice in CaAlSi.
Biswas P K, Lees M R, Balakrishnan G, Liao D Q, Keeble D S, Gavilano J L, Egetenmeyer N, Dewhurst C D, Paul D McK (2012), First-order reorientation transition of the flux-line lattice in CaAlSi., in Physical review letters, 108(7), 077001-1-077001.
Magnetic-field-induced nonlocal effects on the vortex interactions in twin-free YBa2Cu3O7
White JS, Heslop RW, Holmes AT, Forgan EM, Hinkov V, Egetenmeyer N, Gavilano JL, Laver M, Dewhurst CD, Cubitt R, Erb A (2011), Magnetic-field-induced nonlocal effects on the vortex interactions in twin-free YBa2Cu3O7, in PHYSICAL REVIEW B, 84(10), 104519-1-104519-17.
Gap in KFe2As2 studied by small-angle neutron scattering observations of the magnetic vortex lattice
Kawano-Furukawa H, Bowell CJ, White JS, Heslop RW, Cameron AS, Forgan EM, Kihou K, Lee CH, Iyo A, Eisaki H, Saito T, Fukazawa H, Kohori Y, Cubitt R, Dewhurst CD, Gavilano JL, Zolliker M (2011), Gap in KFe2As2 studied by small-angle neutron scattering observations of the magnetic vortex lattice, in PHYSICAL REVIEW B, 84(2), 0274507-1-0274507-8.
Magnetic structure and spin dynamics of the quasi-one-dimensional spin-chain antiferromagnet BaCo2V2O8
Kawasaki Y, Gavilano JL, Keller L, Schefer J, Christensen NB, Amato A, Ohno T, Kishimoto Y, He ZZ, Ueda Y, Itoh M (2011), Magnetic structure and spin dynamics of the quasi-one-dimensional spin-chain antiferromagnet BaCo2V2O8, in PHYSICAL REVIEW B, 83(6), 064421-1-064421-6.
Magnetic vortex lattice in HgBa2CuO4+delta observed by small-angle neutron scattering
Li YA, Egetenmeyer N, Gavilano JL, Barisic N, Greven M (2011), Magnetic vortex lattice in HgBa2CuO4+delta observed by small-angle neutron scattering, in PHYSICAL REVIEW B, 83(5), 054507-1-054507-5.
Magnetic excitations in multiferroic LuMnO3 studied by inelastic neutron scattering
Lewtas HJ, Boothroyd AT, Rotter M, Prabhakaran D, Muller H, Le MD, Roessli B, Gavilano J, Bourges P (2010), Magnetic excitations in multiferroic LuMnO3 studied by inelastic neutron scattering, in PHYSICAL REVIEW B, 82(18), 184420-1-184420-7.
Evidence for a Magnetically Driven Superconducting Q Phase of CeCoIn5
Kenzelmann M, Gerber S, Egetenmeyer N, Gavilano JL, Strassle T, Bianchi AD, Ressouche E, Movshovich R, Bauer ED, Sarrao JL, Thompson JD (2010), Evidence for a Magnetically Driven Superconducting Q Phase of CeCoIn5, in PHYSICAL REVIEW LETTERS, 104(12), 127001-1-127001-4.
Evidence for a magnetically driven superconducting Q phase of CeCoIn5.
Kenzelmann M, Gerber S, Egetenmeyer N, Gavilano J L, Strässle Th, Bianchi A D, Ressouche E, Movshovich R, Bauer E D, Sarrao J L, Thompson J D (2010), Evidence for a magnetically driven superconducting Q phase of CeCoIn5., in Physical review letters, 104(12), 127001-127001.
Fermi Surface and Order Parameter Driven Vortex Lattice Structure Transitions in Twin-Free YBa2Cu3O7
White JS, Hinkov V, Heslop RW, Lycett RJ, Forgan EM, Bowell C, Strassle S, Abrahamsen AB, Laver M, Dewhurst CD, Kohlbrecher J, Gavilano JL, Mesot J, Keimer B, Erb A (2009), Fermi Surface and Order Parameter Driven Vortex Lattice Structure Transitions in Twin-Free YBa2Cu3O7, in PHYSICAL REVIEW LETTERS, 102(9), 097001-1-097001-4.
Fermi surface and order parameter driven vortex lattice structure transitions in twin-free YBa2Cu3O7.
White J S, Hinkov V, Heslop R W, Lycett R J, Forgan E M, Bowell C, Strässle S, Abrahamsen A B, Laver M, Dewhurst C D, Kohlbrecher J, Gavilano J L, Mesot J, Keimer B, Erb A (2009), Fermi surface and order parameter driven vortex lattice structure transitions in twin-free YBa2Cu3O7., in Physical review letters, 102(9), 097001-097001.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Frontier Experiments in Quantum Matter 2012 12.03.2012 Zermatt, Switzerland
MaNEP internal workshop 2012 12.01.2012 Neuchatel, Switzerland
Strongly Correlated Electron Systems 2011 29.08.2011 Cambridge, London, England
Joint Annual Meeting of the Swiss Physical Society & Austrian Physical Society 2011 15.06.2011 Lausanne, Switzerland
MaNEP Review 2011 30.05.2011 Geneva, Switzerland
European Conference on Neutron Scattering 2011, 17.07.2010 Prague, Czech Republic
Low Energy Electrodynamics in Solids 2010, 05.07.2010 Les Diablerets, Switzerland
Strongly Correlated Electron Systems 2010 27.06.2010 Santa Fe, NM, USA
Joint User Meeting at PSI 2009 12.10.2009 Villigen, PSI, Switzerland
Swiss Workshop on Materials with Novel Electronic Properties 2009 26.08.2009 Les Diablerets, Switzerland


Associated projects

Number Title Start Funding scheme
147071 Superconductivity in Unconventional Metals and its Interplay with Magnetism 01.10.2013 Project funding (Div. I-III)
140345 Interplay of Magnetism and Superconductivity in Unconventional Superconductors 01.04.2012 Project funding (Div. I-III)
128714 Dilution Refrigerator for High Field Muon Spin Rotation 01.04.2010 R'EQUIP
139082 Sensitive magnetic susceptibility measurements of materials with novel magnetic correlations and ground states 01.07.2012 R'EQUIP
140345 Interplay of Magnetism and Superconductivity in Unconventional Superconductors 01.04.2012 Project funding (Div. I-III)

Abstract

We request funding to support two Ph.D. students to experimentally study the interplay of magnetism and superconductivity in selected unconventional superconductors. Of particular interest in this project are phase transitions between different superconducting states, particularly those that are related to changes in spatial structures of the superconducting state with magnetic field. Examples include vortex lattices that appear in type II superconductors in the presence of external magnetic fields and, the recently found Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in Pauli-limited, type II superconductors, characterized by a spatial modulation of the superconducting order parameter.1,2 Also of interest are novel magnetic fluctuations and long-range magnetic order in the superconducting phase. The symmetry of the superconducting gap in unconventional superconductivity excludes that the Cooper formation is mediated by phonons. There is strong evidence that unconventional superconductivity is mediated by spin fluctuations. We expect that this leads to interesting coupling phenomena of magnetism and superconductivity, at high magnetic fields, H, where the electrons condense into Cooper pairs as H decreases below Hc2.We will use small angle neutron scattering (SANS) and triple-axis neutron instruments for our studies. The instruments SANS1 and SANS2 at PSI are ideal for our experiments due to the world-wide unique availability of dilution fridge temperatures and high horizontal fields up to H=11 T, while the triple-axis spectrometer RITA-II at PSI is ideal for high-field diffraction studies. Inelastic studies are planned to be carried out at the ILL, Grenoble. Our research program will focus on CeCoIn5, Cd-doped CeCoIn5, UBe13, URu2Si2 and LaBiPt by neutron scattering techniques. These measurements will be complemented, where appropriate, with magnetization measurements and muon-spin rotation measurements. The samples required for this project are high quality single crystals that will be provided mostly by Prof. Andrea Bianchi. Recent successful studies on the vortex lattice by Prof. M. Kenzelmann and Prof. A. Bianchi on CeCoIn5 using SANS1 at PSI have shown that the available expertise and tools are most adequate for our project. The formal adviser of the two Ph.D. students will be Prof. Joel Mesot, ETHZ & PSI._____________________________1 M. Franz, I. Affleck, and M.H. Amin, Theory of Equilibrium Flux Lattices in Unconventional Superconductors, Phys. Rev. Lett., 79, 1555 (1997).2 Y. Matsuda and H. Shimahara, Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors, J. Phys. Soc. Jap. 76, 051005 (2007).
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