Volume 126, Number 2, April 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 June 2019|
Structural, magnetic and dielectric properties of BaFe2Se3 crystals
1 Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, and CAS Key Laboratory of Strongly- coupled Quantum Matter Physics, University of Science and Technology of China - Hefei 230026, China
2 Department of Physics and Astronomy, University of Tennessee - Knoxville, TN 37996-1200, USA
3 School of Physics and Materials Science, Anhui University - Hefei, Anhui 230601, China
4 Collaborative Innovation Center of Advanced Microstructures - Nanjing 210093, China
Received: 22 January 2019
Accepted: 26 April 2019
Recently, theoretical studies have indicated that BaFe2Se3 may host a ferrielectric polarization and an uncompensated ferroelectricity driven by the exchange striction in its magnetic block order. Here, structural, magnetic, electrical transport, dielectric, and magneto-dielectric properties in the BaFe2Se3 single crystals were systematically investigated. Below 320 K, BaFe2Se3 is a semiconductor, and the thermal activated transport processes with different activation energies were used to describe the conductivities in high and low temperature ranges. Magnetization measurements show a crossover from a short-range antiferromagnetic correlation to a long-range antiferromagnetic order at around 230 K and another antiferromagnetic transition at 150 K. The dielectric constant can be changed by about 6% in a magnetic field of 8 T. However, the ferrielectric characteristics of BaFe2Se3 are difficult to be fully verified by electric polarization and dielectric measurements, which may be related to the quite narrow energy gap and low resistivity.
PACS: 77.22.Gm – Dielectric loss and relaxation / 75.50.Ee – Antiferromagnetics / 77.84.-s – Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
© EPLA, 2019
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