Tuesday, December 11, 2012

1212.1976 (Yui Ishii et al.)

YCr6Ge6 as a Candidate Compound for a Kagome Metal    [PDF]

Yui Ishii, Hisatomo Harima, Yoshihiko Okamoto, Jun-ichi Yamaura, Zenji Hiroi
We show that YCr6Ge6, comprising a kagome lattice made up of Cr atoms, is a plausible candidate compound for a kagome metal that is expected to exhibit anomalous phenomena such as flat-band ferromagnetism. Resistivity, magnetization, and heat capacity are measured on single crystals of YCr6Ge6, and band structure calculations are performed to investigate the electronic structure. Curie-Weiss-like behavior in magnetic susceptibility, T2 dependence in resistivity, and a Sommerfeld coefficient doubly enhanced from a calculated value indicate a moderately strong electron correlation. Interestingly, the in-plane resistivity is twice as large as the interplane resistivity, which is contrary to the simple expectation from the layered structure. Band structure calculations demonstrate that there are partially flat bands slightly below the Fermi level near the {\Gamma} point, which is ascribed to Cr 3d3z2-r2 bands and may govern the properties of this compound.
View original: http://arxiv.org/abs/1212.1976

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