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Anisotropic superconductivity and elongated vortices with unusual bound states in quasi-one-dimensional nickel-bismuth compounds

We report low temperature scanning tunneling microscopy and spectroscopy studies of Ni-Bi films grown by molecular beam epitaxy. Highly anisotropic and twofold symmetric superconducting gaps are revealed in two distinct composites, Bi-rich NiBi3 and near-equimolar NixBi, both sharing quasi-one-dimen... Full description

Journal Title: arXiv.org Apr 26, 2018
Main Author: Wen-Lin, Wang
Other Authors: Yi-Min, Zhang , Yan-Feng, Lv , Ding, Hao , Wang, Lili , Li, Wei , He, Ke , Can-Li, Song , Xu-Cun, Ma
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: DOI: 10.1103/PhysRevB.97.134524
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recordid: proquest2072227846
title: Anisotropic superconductivity and elongated vortices with unusual bound states in quasi-one-dimensional nickel-bismuth compounds
format: Article
creator:
  • Wen-Lin, Wang
  • Yi-Min, Zhang
  • Yan-Feng, Lv
  • Ding, Hao
  • Wang, Lili
  • Li, Wei
  • He, Ke
  • Can-Li, Song
  • Xu-Cun, Ma
subjects:
  • Molecular Beam Epitaxy
  • Vortices
  • Vortices
  • Anisotropy
  • Crystal Structure
  • Epitaxial Growth
  • Nickel
  • Superconductivity
  • Elongated Structure
  • Bismuth Compounds
  • Molecular Beam Epitaxy
ispartof: arXiv.org, Apr 26, 2018
description: We report low temperature scanning tunneling microscopy and spectroscopy studies of Ni-Bi films grown by molecular beam epitaxy. Highly anisotropic and twofold symmetric superconducting gaps are revealed in two distinct composites, Bi-rich NiBi3 and near-equimolar NixBi, both sharing quasi-one-dimensional crystal structure. We further reveal axially elongated vortices in both phases, but Caroli-de Gennes-Matricon states solely within the vortex cores of NiBi3. Intriguingly, although the localized bound state splits energetically off at a finite distance ~10 nm away from a vortex center along the minor axis of elliptic vortex, no splitting is found along the major axis. We attribute the elongated vortices and unusual vortex behaviors to the combined effects of twofold superconducting gap and Fermi velocity. The findings provide a comprehensive understanding of the electron pairing and vortex matter in quasi-one-dimensional superconductors
language: eng
source:
identifier: DOI: 10.1103/PhysRevB.97.134524
fulltext: fulltext_linktorsrc
url: Link


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titleAnisotropic superconductivity and elongated vortices with unusual bound states in quasi-one-dimensional nickel-bismuth compounds
creatorWen-Lin, Wang ; Yi-Min, Zhang ; Yan-Feng, Lv ; Ding, Hao ; Wang, Lili ; Li, Wei ; He, Ke ; Can-Li, Song ; Xu-Cun, Ma
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ispartofarXiv.org, Apr 26, 2018
identifierDOI: 10.1103/PhysRevB.97.134524
subjectMolecular Beam Epitaxy ; Vortices ; Vortices ; Anisotropy ; Crystal Structure ; Epitaxial Growth ; Nickel ; Superconductivity ; Elongated Structure ; Bismuth Compounds ; Molecular Beam Epitaxy
descriptionWe report low temperature scanning tunneling microscopy and spectroscopy studies of Ni-Bi films grown by molecular beam epitaxy. Highly anisotropic and twofold symmetric superconducting gaps are revealed in two distinct composites, Bi-rich NiBi3 and near-equimolar NixBi, both sharing quasi-one-dimensional crystal structure. We further reveal axially elongated vortices in both phases, but Caroli-de Gennes-Matricon states solely within the vortex cores of NiBi3. Intriguingly, although the localized bound state splits energetically off at a finite distance ~10 nm away from a vortex center along the minor axis of elliptic vortex, no splitting is found along the major axis. We attribute the elongated vortices and unusual vortex behaviors to the combined effects of twofold superconducting gap and Fermi velocity. The findings provide a comprehensive understanding of the electron pairing and vortex matter in quasi-one-dimensional superconductors
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titleAnisotropic superconductivity and elongated vortices with unusual bound states in quasi-one-dimensional nickel-bismuth compounds
descriptionWe report low temperature scanning tunneling microscopy and spectroscopy studies of Ni-Bi films grown by molecular beam epitaxy. Highly anisotropic and twofold symmetric superconducting gaps are revealed in two distinct composites, Bi-rich NiBi3 and near-equimolar NixBi, both sharing quasi-one-dimensional crystal structure. We further reveal axially elongated vortices in both phases, but Caroli-de Gennes-Matricon states solely within the vortex cores of NiBi3. Intriguingly, although the localized bound state splits energetically off at a finite distance ~10 nm away from a vortex center along the minor axis of elliptic vortex, no splitting is found along the major axis. We attribute the elongated vortices and unusual vortex behaviors to the combined effects of twofold superconducting gap and Fermi velocity. The findings provide a comprehensive understanding of the electron pairing and vortex matter in quasi-one-dimensional superconductors
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abstractWe report low temperature scanning tunneling microscopy and spectroscopy studies of Ni-Bi films grown by molecular beam epitaxy. Highly anisotropic and twofold symmetric superconducting gaps are revealed in two distinct composites, Bi-rich NiBi3 and near-equimolar NixBi, both sharing quasi-one-dimensional crystal structure. We further reveal axially elongated vortices in both phases, but Caroli-de Gennes-Matricon states solely within the vortex cores of NiBi3. Intriguingly, although the localized bound state splits energetically off at a finite distance ~10 nm away from a vortex center along the minor axis of elliptic vortex, no splitting is found along the major axis. We attribute the elongated vortices and unusual vortex behaviors to the combined effects of twofold superconducting gap and Fermi velocity. The findings provide a comprehensive understanding of the electron pairing and vortex matter in quasi-one-dimensional superconductors
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pubCornell University Library, arXiv.org
doi10.1103/PhysRevB.97.134524
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