Longitudinal magnetoresistance of Ce(Cu1-xNix)2Si2

Research output: Contribution to journalArticle

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Abstract

The longitudinal magnetoresistance (LMR) of polycrystalline Ce(Cu1-xNix)2Si2 samples is investigated between T = 2 and 15 K up to H = 80 kOe. The application of magnetic field induces anomalous temperature dependence of the resistivity with the power index n <2 for x = 0.12 and 0.14, in which ρ(T) obeys a T 2-law at H = 0 Oe. A sign-change of the LMR from positive (x <0.03) to negative (x > 0.03) is observed at 2 K. The negative LMR at 80 kOe is maximized (∼ -4 % at T = 2 K) around x ∼ 0.10 and subsequently disappears at higher Ni concentrations. Disappearance of the positive LMR in lower x region and the negative LMR at higher Ni concentrations implies a collapse of a coherent Kondo lattice state, and a rapid enhancement of Kondo temperature, respectively. Anomalous quantum fluctuations are probably developed around x ∼ 0.10.

Original languageEnglish
Pages (from-to)766-767
Number of pages2
JournalJournal of the Korean Physical Society
Volume63
Issue number3
DOIs
Publication statusPublished - Aug 2013

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temperature dependence
electrical resistivity
augmentation
magnetic fields
temperature

Keywords

  • CeCuSi
  • heavy fermion
  • negative magnetoresistance
  • Ni substitution
  • valence fluctuations

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Longitudinal magnetoresistance of Ce(Cu1-xNix)2Si2. / Ikeda, Yoichi; Araki, Shingo; Kobayashi, Tatsuo.

In: Journal of the Korean Physical Society, Vol. 63, No. 3, 08.2013, p. 766-767.

Research output: Contribution to journalArticle

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abstract = "The longitudinal magnetoresistance (LMR) of polycrystalline Ce(Cu1-xNix)2Si2 samples is investigated between T = 2 and 15 K up to H = 80 kOe. The application of magnetic field induces anomalous temperature dependence of the resistivity with the power index n <2 for x = 0.12 and 0.14, in which ρ(T) obeys a T 2-law at H = 0 Oe. A sign-change of the LMR from positive (x <0.03) to negative (x > 0.03) is observed at 2 K. The negative LMR at 80 kOe is maximized (∼ -4 {\%} at T = 2 K) around x ∼ 0.10 and subsequently disappears at higher Ni concentrations. Disappearance of the positive LMR in lower x region and the negative LMR at higher Ni concentrations implies a collapse of a coherent Kondo lattice state, and a rapid enhancement of Kondo temperature, respectively. Anomalous quantum fluctuations are probably developed around x ∼ 0.10.",
keywords = "CeCuSi, heavy fermion, negative magnetoresistance, Ni substitution, valence fluctuations",
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AU - Ikeda, Yoichi

AU - Araki, Shingo

AU - Kobayashi, Tatsuo

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N2 - The longitudinal magnetoresistance (LMR) of polycrystalline Ce(Cu1-xNix)2Si2 samples is investigated between T = 2 and 15 K up to H = 80 kOe. The application of magnetic field induces anomalous temperature dependence of the resistivity with the power index n <2 for x = 0.12 and 0.14, in which ρ(T) obeys a T 2-law at H = 0 Oe. A sign-change of the LMR from positive (x <0.03) to negative (x > 0.03) is observed at 2 K. The negative LMR at 80 kOe is maximized (∼ -4 % at T = 2 K) around x ∼ 0.10 and subsequently disappears at higher Ni concentrations. Disappearance of the positive LMR in lower x region and the negative LMR at higher Ni concentrations implies a collapse of a coherent Kondo lattice state, and a rapid enhancement of Kondo temperature, respectively. Anomalous quantum fluctuations are probably developed around x ∼ 0.10.

AB - The longitudinal magnetoresistance (LMR) of polycrystalline Ce(Cu1-xNix)2Si2 samples is investigated between T = 2 and 15 K up to H = 80 kOe. The application of magnetic field induces anomalous temperature dependence of the resistivity with the power index n <2 for x = 0.12 and 0.14, in which ρ(T) obeys a T 2-law at H = 0 Oe. A sign-change of the LMR from positive (x <0.03) to negative (x > 0.03) is observed at 2 K. The negative LMR at 80 kOe is maximized (∼ -4 % at T = 2 K) around x ∼ 0.10 and subsequently disappears at higher Ni concentrations. Disappearance of the positive LMR in lower x region and the negative LMR at higher Ni concentrations implies a collapse of a coherent Kondo lattice state, and a rapid enhancement of Kondo temperature, respectively. Anomalous quantum fluctuations are probably developed around x ∼ 0.10.

KW - CeCuSi

KW - heavy fermion

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KW - Ni substitution

KW - valence fluctuations

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