Physical Mechanism of Anomalous Heavy Fermion in Yb_4As_3

概要

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Unique anomalous heavy fermion behavior in the charge-ordering low-carrier-density system, Yb_4As_3, has been studied together with a similar compound Sm_4Bi_3 as the reference system. A critical analysis shows that, even in the charge-ordering state, the ratio of the trivalent state is less than one per mole, and a small amount of holes remains at the top of the valence band. Moreover, the trivalent state changes to a pseudogap Kondo state, similar to those in Y-doped YbB_<12> and SmB_6. A simplified model was proposed, and it was shown that various anomalous properties, such as peak structures in the resistivity and Hall constant as functions of temperature, their uniform changes with pressure, and a large residual resistivity, are explained well by this model to be consistent with the properties in Sm_4Bi_3.
社団法人日本物理学会の論文
1994-07-15