### 抄録

The magnetic moment of a single impurity atom in a finite free electron gas is studied in a combined x-ray magnetic circular dichroism spectroscopy, charge transfer multiplet calculation, and density functional theory study of size-selected free chromium-doped gold clusters. The observed size dependence of the local magnetic moment can be understood as a transition from a local moment to a mixed valence regime. This shows that the Anderson impurity model essentially describes finite systems even though the discrete density of states introduces a significant deviation from a bulk metal, and the free electron gas is only formed by less than 10 electrons. Electronic shell closure in the gold host minimizes the interaction of localized impurity states with the confined free electron gas and preserves the magnetic moment of 5μB fully in CrAu2+ and almost fully in CrAu6+. Even for open-shell species, large local moments are observed that scale with the energy gap of the gold cluster. This indicates that an energy gap in the free electron gas stabilizes the local magnetic moment of the impurity atom.

元の言語 | 英語 |
---|---|

記事番号 | 087202 |

ジャーナル | Physical Review Letters |

巻 | 114 |

発行部数 | 8 |

DOI | |

出版物ステータス | 出版済み - 2 25 2015 |

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### All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)

### これを引用

*Physical Review Letters*,

*114*(8), [087202]. https://doi.org/10.1103/PhysRevLett.114.087202

**Magnetic moments of chromium-doped gold clusters : The anderson impurity model in finite systems.** / Hirsch, K.; Zamudio-Bayer, V.; Langenberg, A.; Niemeyer, M.; Langbehn, B.; Möller, T.; Terasaki, Akira; Issendorff, B. V.; Lau, J. T.

研究成果: ジャーナルへの寄稿 › 記事

*Physical Review Letters*, 巻. 114, 番号 8, 087202. https://doi.org/10.1103/PhysRevLett.114.087202

}

TY - JOUR

T1 - Magnetic moments of chromium-doped gold clusters

T2 - The anderson impurity model in finite systems

AU - Hirsch, K.

AU - Zamudio-Bayer, V.

AU - Langenberg, A.

AU - Niemeyer, M.

AU - Langbehn, B.

AU - Möller, T.

AU - Terasaki, Akira

AU - Issendorff, B. V.

AU - Lau, J. T.

PY - 2015/2/25

Y1 - 2015/2/25

N2 - The magnetic moment of a single impurity atom in a finite free electron gas is studied in a combined x-ray magnetic circular dichroism spectroscopy, charge transfer multiplet calculation, and density functional theory study of size-selected free chromium-doped gold clusters. The observed size dependence of the local magnetic moment can be understood as a transition from a local moment to a mixed valence regime. This shows that the Anderson impurity model essentially describes finite systems even though the discrete density of states introduces a significant deviation from a bulk metal, and the free electron gas is only formed by less than 10 electrons. Electronic shell closure in the gold host minimizes the interaction of localized impurity states with the confined free electron gas and preserves the magnetic moment of 5μB fully in CrAu2+ and almost fully in CrAu6+. Even for open-shell species, large local moments are observed that scale with the energy gap of the gold cluster. This indicates that an energy gap in the free electron gas stabilizes the local magnetic moment of the impurity atom.

AB - The magnetic moment of a single impurity atom in a finite free electron gas is studied in a combined x-ray magnetic circular dichroism spectroscopy, charge transfer multiplet calculation, and density functional theory study of size-selected free chromium-doped gold clusters. The observed size dependence of the local magnetic moment can be understood as a transition from a local moment to a mixed valence regime. This shows that the Anderson impurity model essentially describes finite systems even though the discrete density of states introduces a significant deviation from a bulk metal, and the free electron gas is only formed by less than 10 electrons. Electronic shell closure in the gold host minimizes the interaction of localized impurity states with the confined free electron gas and preserves the magnetic moment of 5μB fully in CrAu2+ and almost fully in CrAu6+. Even for open-shell species, large local moments are observed that scale with the energy gap of the gold cluster. This indicates that an energy gap in the free electron gas stabilizes the local magnetic moment of the impurity atom.

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U2 - 10.1103/PhysRevLett.114.087202

DO - 10.1103/PhysRevLett.114.087202

M3 - Article

VL - 114

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 8

M1 - 087202

ER -