Accession Number : AD0746115

Title :   The Heat Capacity of FeCl2:4H2O between 0.4 deg. and 5.3 deg. K.

Descriptive Note : Technical rept.,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF PHYSICS

Personal Author(s) : Raquet,C. A. ; Friedberg,S. A.

Report Date : 11 JUL 1972

Pagination or Media Count : 34

Abstract : The heat capacity, C(p), of polycrystalline FeCl2:4H2O has been determined between 0.42K and 5.34K in a He3-cooled vacuum calorimeter. A rounded Schottky anomaly was found with T(max) about 3K, confirming the earlier conclusion that the zero-field splitting of the Fe(++) ion ground state spin quintet is large with respect to the exchange energy. Two levels lie about 10K below the other three. Well below T(N) the presence of a gap in the excitation spectrum larger than about 2K T(N). A spin wave picture of these excitations provides a quantitative fit of C(p) up to 0.9T(N). (Author)

Descriptors :   (*IRON COMPOUNDS, SPECIFIC HEAT), CHLORIDES, HYDRATES, MAGNETIC PROPERTIES, CRYOGENICS, MOLECULAR ENERGY LEVELS, GROUND STATE, ANTIFERROMAGNETISM

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE