Abstract
We have measured the dielectric constant ε1, and conductivity σ1 along the b-axis in a ferromagnetic (T c = 1 K) semiconductor (ED-TTFVO)2FeBr4 with permanent electric dipoles, using a three-terminal capacitance bridge at frequencies from 10 Hz to 2.8 kHz at excitation voltages from 25-250 mV. The temperature dependence of ε1, which is as large as 10 4-105, shows a broad peak at Tp associated with a hump at Th below Tp. These two anomalous temperatures increase with frequency; Tp = 15 K (10 Hz) - 40 K (2.8 kHz) and Th = 8 K (10 Hz) - 17 K (2.8 kHz). Furthermore, ε1, and σ1 exhibit a remarkable non-linearity with the excitation voltage. These characteristic behaviors are reminiscent of a ferroelectric relaxor.
Original language | English |
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Pages (from-to) | 125-126 |
Number of pages | 2 |
Journal | Journal De Physique. IV : JP |
Volume | 114 |
DOIs | |
Publication status | Published - 2004 |
Externally published | Yes |
Event | ISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets - Port-Bourgenay, France Duration: 2003 Sep 21 → 2003 Sep 26 |
Keywords
- (ED-TTFVO)FeBr
- Dielectric constant
- Ferroelectric relaxor
- Ferromagnetism
- Molecular electric dipoles
- π-d system
ASJC Scopus subject areas
- Physics and Astronomy(all)