Low-temperature heat capacity and magnetic properties of theRNicompounds (R=La, Ce;X=Si, Ge, Sn)
- 1 May 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 43 (13) , 10906-10914
- https://doi.org/10.1103/physrevb.43.10906
Abstract
Heat-capacity (1.4–80 K) and magnetic-susceptibility (1.5–300 K) measurements were carried out for the series of six ternary intermetallic compounds with RNi composition (R=La, Ce and X=Si, Ge, and Sn). All of the LaNi compounds exhibit normal metallic behavior with an electronic specific-heat coefficient in the range 5.2–5.6 mJ/mol and Debye temperature decreasing from 451 K () to 258 K (). The CeNi compounds display anomalous behaviors. is an intermediate-valence compound at high temperatures with the cerium valence varying from 3.35+ at room temperature to 3.65+ at T=50 K, and becomes a spin fluctuator at low (around 3.3 K) temperature. The spin fluctuations can be quenched by an external magnetic field of about 5.3 T. Both and undergo two-step antiferromagnetic phase transitions at =3.9 K and =3.2 K, which are accompanied by sharp anomalies for all properties studied. The electronic specific constants (in units of mJ/mol Ce ) of the three Ce compounds were 45.3±0.6 for , 97.6±0.9 for CeNiGe, and 60.8±0.7 for .
Keywords
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