Optical investigations of the heavy-fermion superconducto

N. Cao, J. Garrett, T. Timusk, H. Liu, D. Tanner

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The optical properties of the heavy-fermion superconductor (Formula presented)(Formula presented) have been investigated at temperatures between 10 and 300 K using reflectance spectroscopy. A characteristic energy scale ((Formula presented)=90 (Formula presented)), with almost the same value as the coherence temperature (Formula presented)=100 K derived from measurements of the dc resistivity and susceptibility, is obtained from the optical conductivity. At high temperatures (T≥(Formula presented)), this scale represents the energy gap between the ground and excited level that results from the crystal-field splitting of the 5(Formula presented) (J=4) level of the tetravalent uranium ion. In the low-temperature coherent region (T<(Formula presented)), a narrow, Drude-like, quasiparticle absorption mode develops. This mode is described using a frequency-dependent scattering rate Γ(ω) and mass enhancement factor λ(ω). This free-carrier mode may originate from a hybridization between the 3d conduction band of nickel and the 5f bands of uranium. Parameters such as the renormalized scattering rate (Formula presented) and plasma frequency (Formula presented) of the quasiparticle mode, as well as the quasiparticle bandwidth W at 10 K are derived using the model developed by Millis and Lee.

Original languageEnglish
Pages (from-to)2601-2605
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number5
DOIs
Publication statusPublished - 1996 Jan 1

Fingerprint

Fermions
fermions
Uranium
Heavy fermion superconductors
Scattering
Optical conductivity
Temperature
Nickel
Conduction bands
Energy gap
Optical properties
Spectroscopy
Ions
Plasmas
Bandwidth
Crystals
uranium
heavy fermion superconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Optical investigations of the heavy-fermion superconducto. / Cao, N.; Garrett, J.; Timusk, T.; Liu, H.; Tanner, D.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 53, No. 5, 01.01.1996, p. 2601-2605.

Research output: Contribution to journalArticle

Cao, N. ; Garrett, J. ; Timusk, T. ; Liu, H. ; Tanner, D. / Optical investigations of the heavy-fermion superconducto. In: Physical Review B - Condensed Matter and Materials Physics. 1996 ; Vol. 53, No. 5. pp. 2601-2605.
@article{729d2e1d842e41da951e83c481ab95a7,
title = "Optical investigations of the heavy-fermion superconducto",
abstract = "The optical properties of the heavy-fermion superconductor (Formula presented)(Formula presented) have been investigated at temperatures between 10 and 300 K using reflectance spectroscopy. A characteristic energy scale ((Formula presented)=90 (Formula presented)), with almost the same value as the coherence temperature (Formula presented)=100 K derived from measurements of the dc resistivity and susceptibility, is obtained from the optical conductivity. At high temperatures (T≥(Formula presented)), this scale represents the energy gap between the ground and excited level that results from the crystal-field splitting of the 5(Formula presented) (J=4) level of the tetravalent uranium ion. In the low-temperature coherent region (T<(Formula presented)), a narrow, Drude-like, quasiparticle absorption mode develops. This mode is described using a frequency-dependent scattering rate Γ(ω) and mass enhancement factor λ(ω). This free-carrier mode may originate from a hybridization between the 3d conduction band of nickel and the 5f bands of uranium. Parameters such as the renormalized scattering rate (Formula presented) and plasma frequency (Formula presented) of the quasiparticle mode, as well as the quasiparticle bandwidth W at 10 K are derived using the model developed by Millis and Lee.",
author = "N. Cao and J. Garrett and T. Timusk and H. Liu and D. Tanner",
year = "1996",
month = "1",
day = "1",
doi = "10.1103/PhysRevB.53.2601",
language = "English",
volume = "53",
pages = "2601--2605",
journal = "Physical Review B - Condensed Matter and Materials Physics",
issn = "1098-0121",
number = "5",

}

TY - JOUR

T1 - Optical investigations of the heavy-fermion superconducto

AU - Cao, N.

AU - Garrett, J.

AU - Timusk, T.

AU - Liu, H.

AU - Tanner, D.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - The optical properties of the heavy-fermion superconductor (Formula presented)(Formula presented) have been investigated at temperatures between 10 and 300 K using reflectance spectroscopy. A characteristic energy scale ((Formula presented)=90 (Formula presented)), with almost the same value as the coherence temperature (Formula presented)=100 K derived from measurements of the dc resistivity and susceptibility, is obtained from the optical conductivity. At high temperatures (T≥(Formula presented)), this scale represents the energy gap between the ground and excited level that results from the crystal-field splitting of the 5(Formula presented) (J=4) level of the tetravalent uranium ion. In the low-temperature coherent region (T<(Formula presented)), a narrow, Drude-like, quasiparticle absorption mode develops. This mode is described using a frequency-dependent scattering rate Γ(ω) and mass enhancement factor λ(ω). This free-carrier mode may originate from a hybridization between the 3d conduction band of nickel and the 5f bands of uranium. Parameters such as the renormalized scattering rate (Formula presented) and plasma frequency (Formula presented) of the quasiparticle mode, as well as the quasiparticle bandwidth W at 10 K are derived using the model developed by Millis and Lee.

AB - The optical properties of the heavy-fermion superconductor (Formula presented)(Formula presented) have been investigated at temperatures between 10 and 300 K using reflectance spectroscopy. A characteristic energy scale ((Formula presented)=90 (Formula presented)), with almost the same value as the coherence temperature (Formula presented)=100 K derived from measurements of the dc resistivity and susceptibility, is obtained from the optical conductivity. At high temperatures (T≥(Formula presented)), this scale represents the energy gap between the ground and excited level that results from the crystal-field splitting of the 5(Formula presented) (J=4) level of the tetravalent uranium ion. In the low-temperature coherent region (T<(Formula presented)), a narrow, Drude-like, quasiparticle absorption mode develops. This mode is described using a frequency-dependent scattering rate Γ(ω) and mass enhancement factor λ(ω). This free-carrier mode may originate from a hybridization between the 3d conduction band of nickel and the 5f bands of uranium. Parameters such as the renormalized scattering rate (Formula presented) and plasma frequency (Formula presented) of the quasiparticle mode, as well as the quasiparticle bandwidth W at 10 K are derived using the model developed by Millis and Lee.

UR - http://www.scopus.com/inward/record.url?scp=0005025046&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0005025046&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.53.2601

DO - 10.1103/PhysRevB.53.2601

M3 - Article

AN - SCOPUS:0005025046

VL - 53

SP - 2601

EP - 2605

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 1098-0121

IS - 5

ER -