Probing the thermal Hall effect using miniature capacitive strontium titanate thermometry
Abstract
The thermal Hall effect is the thermal analog of the electrical Hall effect. Rarely observed in normal metals, thermal Hall signals have been argued to be a key property for a number of strongly correlated materials, such as high temperature superconductors, correlated topological insulators, and quantum magnets. The observation of the thermal Hall effect requires precise measurement of temperature in intense magnetic fields. Particularly at low temperature, resistive thermometers have a strong dependence on field, which makes them unsuitable for this purpose. We have created capacitive thermometers which instead measure the dielectric constant of strontium titanate (SrTiO3). SrTiO3 approaches a ferroelectric transition, causing its dielectric constant to increase by a few orders of magnitude at low temperature. As a result, these thermometers are very sensitive at low temperature while having very little dependence on the applied magnetic field, making them ideal for thermal Hall measurements. We demonstrate this method by making measurements of the thermal Hall effect in Bismuth in magnetic fields of up to 10 T.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 27, 2016
- Source ID
- 10.1063/1.4955069
Entities
People
- Benjamin Lawson
- Caroline Su
- Colin Tinsman
- Fan Yu
- Gang Li
- Lu Li
- Tomoya Asaba
Organizations
- Division of Electrical, Communications & Cyber Systems
- Division of Materials Research
- Office of Naval Research
- United States Department of Energy
- University of California
- University of Michigan