Role of Te in the low-dimensional multiferroic material FeTe2O5Br

Jayita Chakraborty, Nirmal Ganguli, Tanusri Saha-Dasgupta, and Indra Dasgupta
Phys. Rev. B 88, 094409 – Published 9 September 2013

Abstract

Using first principles density functional calculations, we study the electronic structure of the low-dimensional multiferroic compound FeTe2O5Br to investigate the origin of the magnetoelectric (ME) effect and the role of Te ions in this system. We find that without magnetism, even in the presence of Te 5s lone pairs, the system remains centrosymmetric due to the antipolar orientation of the lone pairs. Our study shows that the exchange striction within the Fe tetramers as well as between them is responsible for the ME effect in FeTe2O5Br. We also find that the Te4+ ions play an important role in the intertetramer exchange striction as well as contributing to the electric polarization in FeTe2O5Br, once the polarization is triggered by the magnetic ordering.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 28 June 2013

DOI:https://doi.org/10.1103/PhysRevB.88.094409

©2013 American Physical Society

Authors & Affiliations

Jayita Chakraborty1, Nirmal Ganguli2, Tanusri Saha-Dasgupta3, and Indra Dasgupta1,*

  • 1Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
  • 2Faculty of Science and Technology and MESA+Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
  • 3S. N. Bose National Center for Basic Sciences, JD-III, Salt Lake City, Kolkata 700098, India

  • *sspid@iacs.res.in

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 88, Iss. 9 — 1 September 2013

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×