Specific Heat and ac Susceptibility Studies on Ruthenium Pyrochlores R2Ru2O7 (R=Rare Earths)
✍ Scribed by Nobuyuki Taira; Makoto Wakeshima; Yukio Hinatsu
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 143 KB
- Volume
- 152
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
2 O 7 . Both the real part and the imaginary part of the ac susceptibilities are independent of frequency, indicating that these compounds are not in the ordinary spin-glass. Similar large jumps of speci5c heat are observed at 162, 143, 124, and 118 K for R 2 Ru 2 O 7 (R ؍ Pr, Nd, Sm, and Eu). For Sm 2 Ru 2 O 7 and Eu 2 Ru 2 O 7 , no speci5c heat anomaly has been found at lower temperatures, although magnetic anomaly was observed at ca. 20 K in their dc susceptibility vs temperature curves. ac susceptibility measurements show that both the real and the imaginary susceptibilities show anomaly at ca. 20 K and this temperature decreases with decreasing frequency. These results strongly indicate that the transition observed at ca. 20 K is the spin-glass one. The experimental results on Nd 2 Ru 2 O 7 show that magnetic properties of this compound are complicated.