Open AccessEFFECT OF SUBSTITUTION OF Ni BY Cu ON SPECIFIC HEAT OF CeNiSn
Author(s) -
Xiaohua Hu,
Zhaojia Chen,
Luo Jian-Lin,
Yupeng Wang,
Bai Hai-Yang,
Duo Jin
Publication year - 2000
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.49.2109
Subject(s) - materials science , copper , kondo effect , doping , adiabatic process , diffraction , analytical chemistry (journal) , condensed matter physics , thermodynamics , metallurgy , electrical resistivity and conductivity , physics , optics , chemistry , optoelectronics , chromatography , quantum mechanics
CeNiSn is an interesting heavy fermion compound,with its ground state being a Kondo insulator.The effect of the substitution of Ni by Cu on the specific heat of CeNi1-xCuxSn polycrystal samples is studied through the m ethod of chemical element substitution.A series of samples (x=00,0.02,0.06,0.0 6) were prepared with an electric arc furnace in the atmosphere of flowing high purity argon gas.X-ray powder diffraction analysis shows that all the final samp les have single-phase structure,and that,with the increase of the substitution a mount of Ni,the crystal parameters of the samples become larger.The specific hea t measurements were performed with an adiabatic colorimeter.The results indicate that the doping of Cu increases the specific heat at low temperature,and that t he V-shape gap is gradually suppressed.The physical mechanism may be that the do ping of copper brings about the Kondo lattice discorder and the increase in 3d e lectrons.