Magnetic Instability of the Gap State in CeNiSn at Very Low Temperature

概要

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The low-temperature magnetic property of the gap-type Kondo lattice compoundCeNiSn has been investigated down to 0,08 K by the "'Sn nuclear magnetic resonance(NMR) technique. The temperature dependence of "'Sn nuclear-spin-lattice relaxa-Lion rate (l /T.) down to 0.4 K was well interpreted by a model that the quasi-particledensity of states has a V-shaped structure of the pseudogap proportional to theenergy in the vicinity of the Fermi level. Below 0.13 K, however, (1/ T.) is found todecrease exponentially as exp ( - A /kg T ) due to the appearance of the energy gap of,d =0.25 K. The NMR spectrum starts to broaden below 0.13 K, signifying that theredevelops a static magnetic correlation with a magnetic moment estimated to be assmall as 10-' pg /Ce atom. Itis suggested that the pseudogap state is changed into the"spin gap" state induced by the development of the static magnetic correlation.Kondo lattice, energy gap, magnetic instability, NMR
社団法人日本物理学会の論文
1992-01-15