### Abstract

We have studied the electronic structure of Y(Co_{1-x}Al_{x})_{2} with x=0.0, 0.12, and 0.18, which compositions cover the paramagnetic, metamagnetic, and ferromagnetic phases, by means of photoemission and inverse-photoemission spectroscopy. With Al substitution, broad peaks near the Fermi level (E_{F}) are shifted upwards and one of them crosses E_{F} as predicted by band-structure calculation, although the peaks are much broader than predicted by the calculation. The overall Co 3d band is narrow and has a high binding energy tail compared to the band-structure calculation, indicating significant electron correlation effects in the Co 3d band. In order to explain these observations, model self-energy corrections have been applied to the band density of states. The lower energy scale of the self-energy is found to lie in the same range as the characteristic temperature of the magnetic susceptibility.

Original language | English |
---|---|

Pages (from-to) | 538-542 |

Number of pages | 5 |

Journal | Physical Review B - Condensed Matter and Materials Physics |

Volume | 60 |

Issue number | 1 |

Publication status | Published - 1999 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Condensed Matter Physics

### Cite this

_{1-x}Al

_{x})

_{2}.

*Physical Review B - Condensed Matter and Materials Physics*,

*60*(1), 538-542.

**Photoemission study of weakly magnetic Y(Co _{1-x}Al_{x})_{2}.** / Son, J. Y.; Konishi, T.; Mizokawa, Takashi; Fujimori, A.; Koui, K.; Goto, T.

Research output: Contribution to journal › Article

_{1-x}Al

_{x})

_{2}',

*Physical Review B - Condensed Matter and Materials Physics*, vol. 60, no. 1, pp. 538-542.

_{1-x}Al

_{x})

_{2}. Physical Review B - Condensed Matter and Materials Physics. 1999;60(1):538-542.

}

TY - JOUR

T1 - Photoemission study of weakly magnetic Y(Co1-xAlx)2

AU - Son, J. Y.

AU - Konishi, T.

AU - Mizokawa, Takashi

AU - Fujimori, A.

AU - Koui, K.

AU - Goto, T.

PY - 1999

Y1 - 1999

N2 - We have studied the electronic structure of Y(Co1-xAlx)2 with x=0.0, 0.12, and 0.18, which compositions cover the paramagnetic, metamagnetic, and ferromagnetic phases, by means of photoemission and inverse-photoemission spectroscopy. With Al substitution, broad peaks near the Fermi level (EF) are shifted upwards and one of them crosses EF as predicted by band-structure calculation, although the peaks are much broader than predicted by the calculation. The overall Co 3d band is narrow and has a high binding energy tail compared to the band-structure calculation, indicating significant electron correlation effects in the Co 3d band. In order to explain these observations, model self-energy corrections have been applied to the band density of states. The lower energy scale of the self-energy is found to lie in the same range as the characteristic temperature of the magnetic susceptibility.

AB - We have studied the electronic structure of Y(Co1-xAlx)2 with x=0.0, 0.12, and 0.18, which compositions cover the paramagnetic, metamagnetic, and ferromagnetic phases, by means of photoemission and inverse-photoemission spectroscopy. With Al substitution, broad peaks near the Fermi level (EF) are shifted upwards and one of them crosses EF as predicted by band-structure calculation, although the peaks are much broader than predicted by the calculation. The overall Co 3d band is narrow and has a high binding energy tail compared to the band-structure calculation, indicating significant electron correlation effects in the Co 3d band. In order to explain these observations, model self-energy corrections have been applied to the band density of states. The lower energy scale of the self-energy is found to lie in the same range as the characteristic temperature of the magnetic susceptibility.

UR - http://www.scopus.com/inward/record.url?scp=2442652588&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2442652588&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:2442652588

VL - 60

SP - 538

EP - 542

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 1

ER -