globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1916463117
论文题名:
Momentum-resolved superconducting energy gaps of Sr2RuO4 from quasiparticle interference imaging
作者: Sharma R.; Edkins S.D.; Wang Z.; Kostin A.; Sow C.; Maeno Y.; Mackenzie A.P.; Séamus Davis J.C.; Madhavan V.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:10
起始页码: 5222
结束页码: 5227
语种: 英语
英文关键词: Quasiparticle interference ; Strontium ruthenate ; Superconducting energy gaps
Scopus关键词: article ; crystal ; thermal conductivity
英文摘要: Sr2RuO4 has long been the focus of intense research interest because of conjectures that it is a correlated topological superconductor. It is the momentum space (k-space) structure of the superconducting energy gap Δi(k) on each band i that encodes its unknown superconducting order parameter. However, because the energy scales are so low, it has never been possible to directly measure the Δi(k) of Sr2RuO4. Here, we implement Bogoliubov quasiparticle interference (BQPI) imaging, a technique capable of high-precision measurement of multiband Δi(k). At T = 90 mK, we visualize a set of Bogoliubov scattering interference wavevectors qj : j = 1 − 5 consistent with eight gap nodes/minima that are all closely aligned to the (±1, ± 1) crystal lattice directions on both the α and β bands. Taking these observations in combination with other very recent advances in directional thermal conductivity [E. Hassinger et al., Phys. Rev. X 7, 011032 (2017)], temperature-dependent Knight shift [A. Pustogow et al., Nature 574, 72–75 (2019)], time-reversal symmetry conservation [S. Kashiwaya et al., Phys. Rev B, 100, 094530 (2019)], and theory [A. T. Rømer et al., Phys. Rev. Lett. 123, 247001 (2019); H. S. Roising, T. Scaffidi, F. Flicker, G. F. Lange, S. H. Simon, Phys. Rev. Res. 1, 033108 (2019); and O. Gingras, R. Nourafkan, A. S. Tremblay, M. Côté, Phys. Rev. Lett. 123, 217005 (2019)], the BQPI signature of Sr2RuO4 appears most consistent with Δi(k) having dx2−y2 (B1g) symmetry. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163487
Appears in Collections:气候变化与战略

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作者单位: Sharma, R., Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, United States, Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Upton, NY 11973, United States; Edkins, S.D., Department of Applied Physics, Stanford University, Stanford, CA 94305, United States; Wang, Z., Department of Physics, University of Illinois, Urbana, IL 61801, United States; Kostin, A., Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, United States, Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Upton, NY 11973, United States; Sow, C., Department of Physics, Kyoto University, Kyoto, 606-8502, Japan, Department of Physics, Indian Institute of Technology-Kanpur, Uttar Pradesh, 208016, India; Maeno, Y., Department of Physics, Kyoto University, Kyoto, 606-8502, Japan; Mackenzie, A.P., Physics of Quantum Materials Department, Max Planck Institute for Chemical Physics of Solids, Dresden, D-01187, Germany, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, United Kingdom; Séamus Davis, J.C., Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, United States, Physics of Quantum Materials Department, Max Planck Institute for Chemical Physics of Solids, Dresden, D-01187, Germany, Clarendon Laboratory, University of Oxford, Oxford, OX1 3PU, United Kingdom, Department of Physics, University College Cork, Cork, T12R5C, Ireland; Madhavan, V., Department of Physics, University of Illinois, Urbana, IL 61801, United States

Recommended Citation:
Sharma R.,Edkins S.D.,Wang Z.,et al. Momentum-resolved superconducting energy gaps of Sr2RuO4 from quasiparticle interference imaging[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(10)
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