Electronic structure of studied by Ce resonant photoemission

Im, H.J.; Ito, Takahiro; Kimura, S.; Kim, Hyeong–Do; Hong, Jongbae

doi:10.1016/j.jmmm.2006.10.512

Journal of Magnetism and Magnetic Materials

2007

DOI: 10.1016/j.jmmm.2006.10.512

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Electronic structure of studied by Ce resonant photoemission

H.J. Im

Takahiro Ito

S. Kimura

et al.

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“…Several investigations have been carried out on the intermediate alloys CeNi(Ge 1−x Si x ) 2 . 5,[8][9][10][11] These show a disappearance of magnetism for x 1, and some signs of a QCP. They also show a nonlinear decrease of T N with x, and a transition to IV behavior as x → 1.…”

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confidence: 95%

Non-Doniach-type phase diagram of CeNiGe2

et al. 2012

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The heavy-fermion antiferromagnet CeNiGe 2 was investigated under pressure by resistivity and ac calorimetry up to 4 GPa and down to 40 mK. The two magnetic transitions found in both resistivity and specific heat at 0.1 GPa at T N1 = 3.95 and T N2 = 3.21 K are replaced by a single one at 0.7 GPa and 2.81 K. Increasing pressure initially reduces this further, however, at about 1.7 GPa, a new transition appears, accompanied by a marked change in the pressure dependence of the ordering temperatures, the temperature dependence of the resistivity, and the residual resistivity; the latter indicates a marked change in the quantum fluctuations present. There are signs that this new transition has some first-order character. The phase diagram of CeNiGe 2 bears little resemblance to the Doniach phase diagram widely used to classify heavy-fermion compounds.

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Non-Doniach-type phase diagram of CeNiGe2

et al. 2012

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Fermi surface variation of Ce 4f-electrons in hybridization controlled heavy-fermion systems

Ito

Miyazaki

et al. 2015

Solid State Communications

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Abstract. Ce 3d-4f resonant angle-resolved photoemission measurements on CeCoGe 1.2 Si 0.8 and CeCoSi 2 have been performed to understand the Fermi surface topology as a function of hybridization strength between Ce 4f -and conduction electrons in heavy-fermion systems. We directly observe that the hole-like Ce 4f -Fermi surfaces of CeCoSi 2 is smaller than that of CeCoGe 1.2 Si 0.8 , indicating the evolution of the Ce 4f -Fermi surface with the increase of the hybridization strength. In comparision with LDA calculation, the Fermi surface variation cannot be understood even though the overall electronic structure are roughly explained, indicating the importance of strong correlation effects. We also discuss the relation between the Ce 4f -Fermi surface variation and the Kondo peaks.arXiv:0904.1008v3 [cond-mat.str-el]

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Electronic structure of studied by Ce resonant photoemission

Cited by 2 publications

References 7 publications

Non-Doniach-type phase diagram of CeNiGe2

Non-Doniach-type phase diagram of CeNiGe2

Fermi surface variation of Ce 4f-electrons in hybridization controlled heavy-fermion systems

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