Vortex Lattice and Quasiparticle Density of States in CeRu2 Studied by Scanning Tunneling Spectroscopy

Hideaki Sakata; Nobuhiko Nishida; Masato Hedo; Kenji Sakurai; Yoshihiko Inada; Yoshichika Onuki; Etsuji Yamamoto; Yoshinori Haga

doi:10.1143/JPSJ.69.1970

Vortex Lattice and Quasiparticle Density of States in CeRu₂ Studied by Scanning Tunneling Spectroscopy

Hideaki Sakata, Nobuhiko Nishida, Masato Hedo, Kenji Sakurai, Yoshihiko Inada, Yoshichika Onuki, Etsuji Yamamoto, Yoshinori Haga

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Scanning tunneling microscopy (STM) and spectroscopy (STS) measurements have been performed on an intermetallic compound CeRu₂ down to 2.2 K. Vacuum tunneling spectra have been measured on the surface prepared by cracking the sample in helium gas at 4.2 K. The shape and temperature dependence of the quasiparticle density of states, N_s(E, r), have been well interpreted in terms of s-wave BCS superconductors. In magnetic fields, the hexagonal vortex lattice has been imaged by measurements of N_S(E = 0, r) up to 2 T. This is the first observation of the vortex lattice by STS in heavy-fermion superconductors.

Original language	English
Pages (from-to)	1970-1973
Number of pages	4
Journal	journal of the physical society of japan
Volume	69
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.69.1970
Publication status	Published - Jul 2000
Externally published	Yes

Keywords

CeRu
Scanning tunneling microscopy
Scanning tunneling spectroscopy
Superconductor
Vortex lattice

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.69.1970

Cite this

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title = "Vortex Lattice and Quasiparticle Density of States in CeRu2 Studied by Scanning Tunneling Spectroscopy",

abstract = "Scanning tunneling microscopy (STM) and spectroscopy (STS) measurements have been performed on an intermetallic compound CeRu2 down to 2.2 K. Vacuum tunneling spectra have been measured on the surface prepared by cracking the sample in helium gas at 4.2 K. The shape and temperature dependence of the quasiparticle density of states, Ns(E, r), have been well interpreted in terms of s-wave BCS superconductors. In magnetic fields, the hexagonal vortex lattice has been imaged by measurements of NS(E = 0, r) up to 2 T. This is the first observation of the vortex lattice by STS in heavy-fermion superconductors.",

keywords = "CeRu, Scanning tunneling microscopy, Scanning tunneling spectroscopy, Superconductor, Vortex lattice",

author = "Hideaki Sakata and Nobuhiko Nishida and Masato Hedo and Kenji Sakurai and Yoshihiko Inada and Yoshichika Onuki and Etsuji Yamamoto and Yoshinori Haga",

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language = "English",

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T1 - Vortex Lattice and Quasiparticle Density of States in CeRu2 Studied by Scanning Tunneling Spectroscopy

AU - Sakata, Hideaki

AU - Nishida, Nobuhiko

AU - Hedo, Masato

AU - Sakurai, Kenji

AU - Inada, Yoshihiko

AU - Onuki, Yoshichika

AU - Yamamoto, Etsuji

AU - Haga, Yoshinori

PY - 2000/7

Y1 - 2000/7

N2 - Scanning tunneling microscopy (STM) and spectroscopy (STS) measurements have been performed on an intermetallic compound CeRu2 down to 2.2 K. Vacuum tunneling spectra have been measured on the surface prepared by cracking the sample in helium gas at 4.2 K. The shape and temperature dependence of the quasiparticle density of states, Ns(E, r), have been well interpreted in terms of s-wave BCS superconductors. In magnetic fields, the hexagonal vortex lattice has been imaged by measurements of NS(E = 0, r) up to 2 T. This is the first observation of the vortex lattice by STS in heavy-fermion superconductors.

AB - Scanning tunneling microscopy (STM) and spectroscopy (STS) measurements have been performed on an intermetallic compound CeRu2 down to 2.2 K. Vacuum tunneling spectra have been measured on the surface prepared by cracking the sample in helium gas at 4.2 K. The shape and temperature dependence of the quasiparticle density of states, Ns(E, r), have been well interpreted in terms of s-wave BCS superconductors. In magnetic fields, the hexagonal vortex lattice has been imaged by measurements of NS(E = 0, r) up to 2 T. This is the first observation of the vortex lattice by STS in heavy-fermion superconductors.

KW - CeRu

KW - Scanning tunneling microscopy

KW - Scanning tunneling spectroscopy

KW - Superconductor

KW - Vortex lattice

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