Dramatic change of optical properties at a quantum critical point in the heavy fermion system CeNi1 - x Cox Ge2

Y. Y. Song; K. E. Lee; J. B. Hong; H. J. Im; S. Kimura; Y. S. Kwon

doi:10.1016/j.infrared.2007.12.020

Dramatic change of optical properties at a quantum critical point in the heavy fermion system CeNi_{1 - x} Co_x Ge₂

Y. Y. Song, K. E. Lee, J. B. Hong, H. J. Im, S. Kimura, Y. S. Kwon

Department of Physics and Chemistry

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

Abstract

Optical properties of CeNi_{1 - x} Co_x Ge₂ (0 ≤ x ≤ 1) have been studied via infrared spectroscopy. For x > 0.3, a hump in the optical conductivity σ₁ is observed at about 0.2 eV, resulting from strong hybridization between conduction electrons and Ce 4-f electronic states. For x ≤ 0.3, in contrast, no such hump is observed. The low frequency plasmon indicating the existence of heavy particles is also observed below coherence temperature T^* for x > 0.3.

Original language	English
Pages (from-to)	485-487
Number of pages	3
Journal	Infrared Physics and Technology
Volume	51
Issue number	5
DOIs	https://doi.org/10.1016/j.infrared.2007.12.020
State	Published - May 2008

Bibliographical note

Funding Information:
This work is supported by the Korea Science and Engineering Foundation through the Center for Strongly Correlated Materials Research (CSCMR) at Seoul National University, by Grant No. R01-2003-000-10095-0 from the Basic Research Program of the Korea Science and Engineering Foundation, and by Korea Research Foundation through Grant No. KRF-2005-070-C00044, and is performed for the Nuclear R&D Programs funded by the Ministry of Science and Technology (MOST) of Korea.

Keywords

CeNi Co Ge
Hybridization gap
Optical conductivity
Quantum criticality

Access to Document

10.1016/j.infrared.2007.12.020

Cite this

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title = "Dramatic change of optical properties at a quantum critical point in the heavy fermion system CeNi1 - x Cox Ge2",

abstract = "Optical properties of CeNi1 - x Cox Ge2 (0 ≤ x ≤ 1) have been studied via infrared spectroscopy. For x > 0.3, a hump in the optical conductivity σ1 is observed at about 0.2 eV, resulting from strong hybridization between conduction electrons and Ce 4-f electronic states. For x ≤ 0.3, in contrast, no such hump is observed. The low frequency plasmon indicating the existence of heavy particles is also observed below coherence temperature T* for x > 0.3.",

keywords = "CeNi Co Ge, Hybridization gap, Optical conductivity, Quantum criticality",

author = "Song, {Y. Y.} and Lee, {K. E.} and Hong, {J. B.} and Im, {H. J.} and S. Kimura and Kwon, {Y. S.}",

note = "Funding Information: This work is supported by the Korea Science and Engineering Foundation through the Center for Strongly Correlated Materials Research (CSCMR) at Seoul National University, by Grant No. R01-2003-000-10095-0 from the Basic Research Program of the Korea Science and Engineering Foundation, and by Korea Research Foundation through Grant No. KRF-2005-070-C00044, and is performed for the Nuclear R&D Programs funded by the Ministry of Science and Technology (MOST) of Korea.",

year = "2008",

month = may,

doi = "10.1016/j.infrared.2007.12.020",

language = "English",

volume = "51",

pages = "485--487",

journal = "Infrared Physics and Technology",

issn = "1350-4495",

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TY - JOUR

T1 - Dramatic change of optical properties at a quantum critical point in the heavy fermion system CeNi1 - x Cox Ge2

AU - Song, Y. Y.

AU - Lee, K. E.

AU - Hong, J. B.

AU - Im, H. J.

AU - Kimura, S.

AU - Kwon, Y. S.

N1 - Funding Information: This work is supported by the Korea Science and Engineering Foundation through the Center for Strongly Correlated Materials Research (CSCMR) at Seoul National University, by Grant No. R01-2003-000-10095-0 from the Basic Research Program of the Korea Science and Engineering Foundation, and by Korea Research Foundation through Grant No. KRF-2005-070-C00044, and is performed for the Nuclear R&D Programs funded by the Ministry of Science and Technology (MOST) of Korea.

PY - 2008/5

Y1 - 2008/5

N2 - Optical properties of CeNi1 - x Cox Ge2 (0 ≤ x ≤ 1) have been studied via infrared spectroscopy. For x > 0.3, a hump in the optical conductivity σ1 is observed at about 0.2 eV, resulting from strong hybridization between conduction electrons and Ce 4-f electronic states. For x ≤ 0.3, in contrast, no such hump is observed. The low frequency plasmon indicating the existence of heavy particles is also observed below coherence temperature T* for x > 0.3.

AB - Optical properties of CeNi1 - x Cox Ge2 (0 ≤ x ≤ 1) have been studied via infrared spectroscopy. For x > 0.3, a hump in the optical conductivity σ1 is observed at about 0.2 eV, resulting from strong hybridization between conduction electrons and Ce 4-f electronic states. For x ≤ 0.3, in contrast, no such hump is observed. The low frequency plasmon indicating the existence of heavy particles is also observed below coherence temperature T* for x > 0.3.

KW - CeNi Co Ge

KW - Hybridization gap

KW - Optical conductivity

KW - Quantum criticality

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DO - 10.1016/j.infrared.2007.12.020

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