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Petrović AP, Raju M, Tee XY, Louat A, Maggio-Aprile I, Menezes RM, Wyszyński MJ, Duong NK, Reznikov M, Renner C, Milošević MV, Panagopoulos C. Skyrmion-(Anti)Vortex Coupling in a Chiral Magnet-Superconductor Heterostructure. Phys Rev Lett 2021; 126:117205. [PMID: 33798341 DOI: 10.1103/physrevlett.126.117205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Accepted: 01/14/2021] [Indexed: 06/12/2023]
Abstract
We report experimental coupling of chiral magnetism and superconductivity in [IrFeCoPt]/Nb heterostructures. The stray field of skyrmions with radius ≈50 nm is sufficient to nucleate antivortices in a 25 nm Nb film, with unique signatures in the magnetization, critical current, and flux dynamics, corroborated via simulations. We also detect a thermally tunable Rashba-Edelstein exchange coupling in the isolated skyrmion phase. This realization of a strongly interacting skyrmion-(anti)vortex system opens a path toward controllable topological hybrid materials, unattainable to date.
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Affiliation(s)
- A P Petrović
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - M Raju
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - X Y Tee
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - A Louat
- Department of Physics, Technion, Haifa 32000, Israel
| | - I Maggio-Aprile
- Department of Quantum Matter Physics, Université de Genève, 24 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
| | - R M Menezes
- Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
- Departamento de Física, Universidade Federal de Pernambuco, Cidade Universitária, 50670-901 Recife-PE, Brazil
| | - M J Wyszyński
- Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - N K Duong
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - M Reznikov
- Department of Physics, Technion, Haifa 32000, Israel
| | - Ch Renner
- Department of Quantum Matter Physics, Université de Genève, 24 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
| | - M V Milošević
- Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - C Panagopoulos
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
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Fasano Y, Maggio-Aprile I, Zhigadlo ND, Katrych S, Karpinski J, Fischer Ø. Local quasiparticle density of states of superconducting SmFeAsO(1-x)F(x) single crystals: evidence for spin-mediated pairing. Phys Rev Lett 2010; 105:167005. [PMID: 21231000 DOI: 10.1103/physrevlett.105.167005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2009] [Indexed: 05/30/2023]
Abstract
We probe the local quasiparticles density of states in micron-sized SmFeAsO(1-x)F(x) single crystals by means of scanning tunnelling spectroscopy. Spectral features resemble those of cuprates, particularly a dip-hump-like structure developed at energies larger than the gap that can be ascribed to the coupling of quasiparticles to a collective mode, quite likely a resonant spin mode. The energy of the collective mode revealed in our study decreases when the pairing strength increases. Our findings support spin-fluctuation-mediated pairing in pnictides.
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Affiliation(s)
- Y Fasano
- DPMC-MaNEP, University of Geneva, Geneva, Switzerland
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Jenkins N, Fasano Y, Berthod C, Maggio-Aprile I, Piriou A, Giannini E, Hoogenboom BW, Hess C, Cren T, Fischer Ø. Imaging the essential role of spin fluctuations in high-T(c) superconductivity. Phys Rev Lett 2009; 103:227001. [PMID: 20366120 DOI: 10.1103/physrevlett.103.227001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2008] [Revised: 09/14/2009] [Indexed: 05/29/2023]
Abstract
We have used scanning tunneling spectroscopy to investigate short-length electronic correlations in three-layer Bi2Sr2Ca2Cu3O(10+delta) (Bi-2223). We show that the superconducting gap and the energy Omega(dip), defined as the difference between the dip minimum and the gap, are both modulated in space following the lattice superstructure and are locally anticorrelated. Based on fits of our data to a microscopic strong-coupling model, we show that Omega(dip) is an accurate measure of the collective-mode energy in Bi-2223. We conclude that the collective mode responsible for the dip is a local excitation with a doping dependent energy and is most likely the (pi, pi) spin resonance.
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Affiliation(s)
- N Jenkins
- DPMC-MaNEP, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
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Salluzzo M, Palomba F, Pica G, Andreone A, Maggio-Aprile I, Fischer O, Cantoni C, Norton DP. Role of Nd/Ba disorder on the penetration depth of Nd(1+x)Ba(2-x)Cu(3)O(7-delta) thin films. Phys Rev Lett 2000; 85:1116-1119. [PMID: 10991488 DOI: 10.1103/physrevlett.85.1116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/1999] [Indexed: 05/23/2023]
Abstract
We report on a study on the effect of Nd/Ba disorder on the ab-plane penetration depth of epitaxial Nd(1+x)Ba(2-x)Cu(3)O(7-delta) thin films. While in stoichiometric samples lambda(T) at low temperature is linear, Nd-rich films exhibit a quadratic law. For low Nd excess (x<0.04), a satisfying fit is obtained using the "dirty" d-wave model assuming that Nd ions at Ba sites act as strong scattering centers. At high x (x>0.15) the data are explained if Nd/Ba disorder becomes less effective as a source of scattering. The effect of localization has been discussed to account for the experimental results.
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Affiliation(s)
- M Salluzzo
- INFM and Dipartimento di Scienze Fisiche, Universita di Napoli Federico II, I-80125 Napoli, Italy
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Maggio-Aprile I, Renner C, Erb A, Walker E, Fischer O. Direct vortex lattice imaging and tunneling spectroscopy of flux lines on YBa2Cu3O7- delta. Phys Rev Lett 1995; 75:2754-2757. [PMID: 10059396 DOI: 10.1103/physrevlett.75.2754] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Kent AD, Maggio-Aprile I, Niedermann P, Fischer O. Direct measurements of the effects of inhomogeneities on the normal-state transport properties of YBa2Cu3O7-x thin films. Phys Rev B Condens Matter 1989; 39:12363-12366. [PMID: 9948094 DOI: 10.1103/physrevb.39.12363] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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