High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2

Abstract Magnetic fluctuations is the leading candidate for pairing in cuprate, iron-based, and heavy fermion superconductors. This view is challenged by the recent discovery of nodeless superconductivity in CeCu2Si2, and calls for a detailed understanding of the corresponding magnetic fluctuations....

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Autores principales:	Yu Song, Weiyi Wang, Chongde Cao, Zahra Yamani, Yuanji Xu, Yutao Sheng, Wolfgang Löser, Yiming Qiu, Yi-feng Yang, Robert J. Birgeneau, Pengcheng Dai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/c5b7d5bdad354e92ab6be1a1abe56149
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spelling	oai:doaj.org-article:c5b7d5bdad354e92ab6be1a1abe561492021-12-02T17:39:57ZHigh-energy magnetic excitations from heavy quasiparticles in CeCu2Si210.1038/s41535-021-00358-x2397-4648https://doaj.org/article/c5b7d5bdad354e92ab6be1a1abe561492021-06-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00358-xhttps://doaj.org/toc/2397-4648Abstract Magnetic fluctuations is the leading candidate for pairing in cuprate, iron-based, and heavy fermion superconductors. This view is challenged by the recent discovery of nodeless superconductivity in CeCu2Si2, and calls for a detailed understanding of the corresponding magnetic fluctuations. Here, we mapped out the magnetic excitations in superconducting (S-type) CeCu2Si2 using inelastic neutron scattering, finding a strongly asymmetric dispersion for E ≲ 1.5 meV, which at higher energies evolves into broad columnar magnetic excitations that extend to E ≳ 5 meV. While low-energy magnetic excitations exhibit marked three-dimensional characteristics, the high-energy magnetic excitations in CeCu2Si2 are almost two-dimensional, reminiscent of paramagnons found in cuprate and iron-based superconductors. By comparing our experimental findings with calculations in the random-phase approximation,we find that the magnetic excitations in CeCu2Si2 arise from quasiparticles associated with its heavy electron band, which are also responsible for superconductivity. Our results provide a basis for understanding magnetism and superconductivity in CeCu2Si2, and demonstrate the utility of neutron scattering in probing band renormalization in heavy fermion metals.Yu SongWeiyi WangChongde CaoZahra YamaniYuanji XuYutao ShengWolfgang LöserYiming QiuYi-feng YangRobert J. BirgeneauPengcheng DaiNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Yu Song Weiyi Wang Chongde Cao Zahra Yamani Yuanji Xu Yutao Sheng Wolfgang Löser Yiming Qiu Yi-feng Yang Robert J. Birgeneau Pengcheng Dai High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2
description	Abstract Magnetic fluctuations is the leading candidate for pairing in cuprate, iron-based, and heavy fermion superconductors. This view is challenged by the recent discovery of nodeless superconductivity in CeCu2Si2, and calls for a detailed understanding of the corresponding magnetic fluctuations. Here, we mapped out the magnetic excitations in superconducting (S-type) CeCu2Si2 using inelastic neutron scattering, finding a strongly asymmetric dispersion for E ≲ 1.5 meV, which at higher energies evolves into broad columnar magnetic excitations that extend to E ≳ 5 meV. While low-energy magnetic excitations exhibit marked three-dimensional characteristics, the high-energy magnetic excitations in CeCu2Si2 are almost two-dimensional, reminiscent of paramagnons found in cuprate and iron-based superconductors. By comparing our experimental findings with calculations in the random-phase approximation,we find that the magnetic excitations in CeCu2Si2 arise from quasiparticles associated with its heavy electron band, which are also responsible for superconductivity. Our results provide a basis for understanding magnetism and superconductivity in CeCu2Si2, and demonstrate the utility of neutron scattering in probing band renormalization in heavy fermion metals.
format	article
author	Yu Song Weiyi Wang Chongde Cao Zahra Yamani Yuanji Xu Yutao Sheng Wolfgang Löser Yiming Qiu Yi-feng Yang Robert J. Birgeneau Pengcheng Dai
author_facet	Yu Song Weiyi Wang Chongde Cao Zahra Yamani Yuanji Xu Yutao Sheng Wolfgang Löser Yiming Qiu Yi-feng Yang Robert J. Birgeneau Pengcheng Dai
author_sort	Yu Song
title	High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2
title_short	High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2
title_full	High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2
title_fullStr	High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2
title_full_unstemmed	High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2
title_sort	high-energy magnetic excitations from heavy quasiparticles in cecu2si2
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c5b7d5bdad354e92ab6be1a1abe56149
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High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2

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