Measurements on magnetoelectrics under extreme conditions.

• Main Author: Sunku Sai Swaroop.
• Other Authors: School of Physical and Mathematical Sciences
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Science::Physics::Electricity and magnetism
• Online Access: http://hdl.handle.net/10356/45336
• Institution: Nanyang Technological University

This work investigates the properties of a potential magnetoelectric multiferroic EuTiO3. The interest in this material is due to it’s unusual low temperature properties. A quantum paraelectric and an antiferromagnet, it exhibits a small anomaly in the dielectric constant and magnetisation simultaneously below the N´eel temperature. It is suspected that the small anomaly is the signature of a transition to a ferroelectric state. In this work, the specific heat data was analysed and it was found that there is no thermodynamic phase transition below the N´eel temperature. The magnetisation data confirmed that the unusual anisotropy found previously was due to a misalignment of the crystal axes. A system to measure the dielectric constant in the PPMS using the three terminal technique was built and was tested using a reference sample of SrTiO3.