Specific heat of with two-dimensional Ce atoms alignment

✍ Scribed by M. Ito; K. Asada; Y. Nakamori; H. Fujii; T. Suzuki

• Book ID: 103885454
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 268 KB
• Volume: 403
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2007.10.036

✦ Synopsis

We have carried out the specific heat C P ðTÞ measurements on CeMg 2 ðCu 1Àx Ni x Þ 9 ðx ¼ 0 and 0.02) in which the Ce atoms are a twodimensional arrangement. The large anomalies are observed at the Ne´el temperature T N ¼ 2:5 and 1.7 K for x ¼ 0 and 0.02, respectively. The magnetic specific heat C mag (T) of the samples for both concentration show the Schottky-type anomaly around 30 K. This is originated from the crystal electric field (CEF) splitting of the 4f states with the first excited level D 1 and the second excited level D 2 from the ground state. The obtained values of these (D 1 =k B ¼ 78 K and D 2 =k B ¼ 143 K) on x ¼ 0:02 are larger than the values on x ¼ 0 (60 and 130 K). The enhancement of the CEF splitting of the 4f states might result from the chemical compression due to substitution of small amount of the Ni ion for the Cu ion.