Magnetic and electrical properties of LaC/sub 2/, CeC/sub 2/, PrC/sub 2/, NdC/sub 2/, and SmC/sub 2/
The electrical resistivities of the tetragonal CaC/sub 2/-type rare-earth dicarbides RC/sub 2/ (R = La, Ce, Pr, Nd, and Sm) and the magnetic susceptibilities of RC/sub 2/ (R = Pr, Nd, and Sm) are reported. The dicarbide LaC/sub 2/ becomes a superconductor at 1.6 K, which is in good agreement with literature values. The resistivity vs temperature curve of CeC/sub 2/ indicates a small hump at 30 K, and those of PrC/sub 2/ and NdC/sub 2/ show a sharp change in slope at 18 and 25 K, respectively, all verifying the antiferromagnetic transitions found by neutron diffraction. The temperature dependence of resistivity of CeC/sub 2/ was explained on the basis of the GAMMA/sub 7/ components of Ce/sup 3 +/. The compound PrC/sub 2/ becomes ferromagnetic at a zero-field Curie temperature of 7 K. This magnetic behavior differs significantly from that reported previously, suggesting an antiferromagnetic-to-ferromagnetic transition in the field of less than 700 Oe. The susceptibility of NdC/sub 2/ shows a field-independent antiferromagnetic transition at 24 K. An antiferromagnetic transition in SmC/sub 2/ was found anew at 21 K in both the resistivity and susceptibility data, exhibiting Van Vleck's Sm/sup 3 +/ characteristics. The Sm/sup 3 +/ ion in SmC/sub 2/ appears to be largely confined in the J = 5/2 ground state at about 21 K, since the paramagnetic Curie temperature reduced thereby and those of the other dicarbides can be correlated reasonably in the de Gennes factor plot.
- Research Organization:
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Yamadakami, Suita-Shi, Osaka-Fu, 565 Japan
- OSTI ID:
- 6202225
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 75:6
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structure and physical properties of RT{sub 2}Cd{sub 20} (R=rare earth, T=Ni, Pd) compounds with the CeCr{sub 2}Al{sub 20}-type structure
Structure and physical properties of rare-earth zinc antimonides REZn{sub 1-} {sub x} Sb{sub 2} (RE=La, Ce, Pr, Nd, Sm, Gd, Tb)
Related Subjects
CERIUM CARBIDES
ELECTRIC CONDUCTIVITY
LANTHANUM CARBIDES
NEODYMIUM CARBIDES
MAGNETIC SUSCEPTIBILITY
PRASEODYMIUM CARBIDES
SAMARIUM CARBIDES
ANTIFERROMAGNETISM
TEMPERATURE DEPENDENCE
CARBIDES
CARBON COMPOUNDS
CERIUM COMPOUNDS
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETISM
NEODYMIUM COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties