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Title: Probing the thermal Hall effect using miniature capacitive strontium titanate thermometry

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 (SrTiO 3). SrTiO 3 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. Here, we demonstrate this method by making measurements of the thermal Hall effect in Bismuth in magnetic fields of up to 10 T.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
  2. Univ. of California, Berkeley, CA (United States). Dept. of Physics
Publication Date:
Grant/Contract Number:
SC0008110; N00014-15-1-2382; ECCS-1307744; DMR-1428226; F031543
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 26; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE Office of Science (SC); US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF); Heiwa Nakajima Foundation
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; thermal transport; semimetal; quantum paraelectricity
OSTI Identifier:
1467830
Alternate Identifier(s):
OSTI ID: 1259741