Magnetic Properties of RPd3S4 (R=Ce, Gd)

✍ Scribed by Makoto Wakeshima; Yukio Hinatsu

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 127 KB
• Volume: 146
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8341

✦ Synopsis

Magnetic properties of palladium sul5de bronzes RPd 3 S 4 (R ‫؍‬ Ce, Gd) are reported. They crystallize in a cubic platinum bronze type structure. Their magnetic susceptibilities were measured from 2 to 350 K. The initial magnetization and magnetic hysteresis loop were measured at 2 K by changing the applied magnetic 5eld between ؊5 and 5 T. The electron paramagnetic resonance (EPR) spectrum of Gd 3؉ was also measured at room temperature. GdPd 3 S 4 shows an antiferromagnetic behavior below 5.8 K. Above 10 K the magnetic susceptibility follows the Curie law, and the e4ective magnetic moment is determined to be 7.36 B . The magnetic moment is not saturated up to 5 T and no magnetic hysteresis has been found. From the EPR measurement the g value of Gd 3؉ in GdPd 3 S 4 is determined to be 2.00. CePd 3 S 4 shows ferromagnetism below 5.8 K. The residual magnetization is only 0.39 B and the magnetic moment at 5 T is 0.83 B at 2 K. This result shows that the ground state 8 of Ce 3؉ is split into two Kramer:s doublets by the crystal 5eld. From the magnetic transition temperature of both GdPd 3 S 4 and CePd 3 S 4 , the superexchange interaction is considered to be dominant in the magnetic interaction of these compounds.