このエントリーをはてなブックマークに追加
ID 18728
本文ファイル
著者
Hossain, Z.
Ohmoto, Hirohisa
Iga, Fumitoshi
Takamoto, Naoki
Kindo, Koichi
抄録(英)
The results of electrical resistivity, magnetic susceptibility, specific heat, isothermal magnetization, and magnetoresistance measurements on Ce2Rh3Ge5 and Ce2Ir3Ge5 are reported. For both systems, the magnetic contribution to the resistivity shows the logarithmic T dependence in two separate T ranges being typical of a Kondo-lattice system in the presence of crystalline field. A marked peak in the susceptibility and a sharp drop in the resistivity are observed at TN=5.5 and 9.5 K for Ce2Rh3Ge5 and Ce2Ir3Ge5, respectively. The total drop in resistivity is as large as 300 μΩ cm. Isothermal magnetization curves at 1.3 K reveal a field induced transition at 23 T in Ce2Rh3Ge5 and two transitions at 10 and 15 T in Ce2Ir3Ge5. The saturation moment of 0.8μB/Ce is suggestive of the Γ7 doublet ground state in both compounds. The specific heat exhibits a λ-type anomaly around TN, while the values of magnetic entropy at TN are reduced to 50 and 65% of R ln 2 for Ce2Rh3Ge5 and Ce2Ir3Ge5, respectively. The linear coefficients of specific heat are 148 and 152 mJ/K2mol Ce above TN. Thus both compounds are classified into moderate heavy-fermion antiferromagnets.
掲載誌名
Physical Review B - Condensed Matter and Materials Physics
60巻
14号
開始ページ
10 383
終了ページ
10 387
出版年月日
1999-10-01
出版者
American Physical Society
ISSN
0163-1829
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 1999 American Physical Society.
関連情報URL
部局名
先端物質科学研究科