填充式方钴矿化合物CeOs_4Sb_(12)近藤相互作用的非弹性中子散射研究

Kondo interactions in the CeOs_4Sb_(12) skutterudite studied by inelastic neutron scattering

CeOs4Sb12晶体中由于导电电子与Ce3+4f1电子之间存在c-f杂化作用导致费米面附近存在能量间隙.这种c-f近藤相互作用和能量间隙是理解CeOs4Sb12物理性质,如近藤绝缘体行为、Ce3+磁矩在低温下猝灭以及重费米性等电、磁性质的关键.当用LAM-D中子谱仪对粉末CeOs4Sb12进行测量时,可以得到不同温度下CeOs4Sb12的非弹性中子散射谱.结果表明CeOs4Sb12中存在近藤相互作用,其作用强度为3·1meV,证实了CeOs4Sb12为近藤绝缘体.中子测量得出CeOs4Sb12德拜温度为317K.

The energy gap near Fermi surface due to the hybridization of Ce^3＋ 4f^1 and conduction electrons is the key to understand the physical properties of the CeOs4Sbl2 compound, such as Kondo insulating behavior, moment quench of Ce^3＋ at low temperatures and the characteristics of heavy fermion. In this work, inelastic neutron scattering spectra of powder CeOs4 Sb12 sample were collected at different temperatures using LAM-D neutron spectrometer at KEK pulsed neutron source. The result indicates that the CeOs4Sb12 skutterudite is a Kondo insulator with a c-f interaction of 3.1 meV. The Debye temperature is determined as 317 K.