Effect of Pressure on Antiferromagnetic Transition in Alkali-Electro-Sodalite |
| |
| Authors: | Kenji Mizoguchi Tetsushi Takanashi Hirokazu Sakamoto Ljiljana Damjanovic Vojislav I. Srdanov |
| |
| Affiliation: | 1. Dept. of Phys. , Tokyo Metropolitan Univ. , Hachioji, Tokyo , 192-0397 , Japan;2. Dept. of Chem. , Univ. of California , Santa Barbara , CA , 93106 , USA;3. Dept. of Chem. , Univ. of California , Santa Barbara , CA , 93106 , USA |
| |
| Abstract: | Abstract Pressure (0–19 kbar) and temperature (4–300 K) dependent EPR study of Sodium-Electro-Sodalite (SES) is presented. SES, which consists of a bcc sub-lattice of F-centers supported by a zeolite-like framework, is known to be a Mott insulator at room temperature. On cooling, SES undergoes an AF transition at 48±2 K providing the first example of an s-electron antiferromagnet. We find that the width of the EPR resonance above T N is influenced not only by a strong exchange interaction, but also by a fast spin-lattice relaxation. Also, with increasing pressure, T N decreases linearly and extrapolates to 0 K at about 65 kbar. The reason for this seemingly unexpected behavior is briefly discussed. |
| |
| Keywords: | sodium-electro-sodalite F-center antiferromagnetic transition EPR line width pressure |
|
|
