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

Authors:
; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1259741
Grant/Contract Number:
SC0008110
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 26; Related Information: CHORUS Timestamp: 2016-12-29 11:04:42; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Tinsman, Colin, Li, Gang, Su, Caroline, Asaba, Tomoya, Lawson, Benjamin, Yu, Fan, and Li, Lu. Probing the thermal Hall effect using miniature capacitive strontium titanate thermometry. United States: N. p., 2016. Web. doi:10.1063/1.4955069.
Tinsman, Colin, Li, Gang, Su, Caroline, Asaba, Tomoya, Lawson, Benjamin, Yu, Fan, & Li, Lu. Probing the thermal Hall effect using miniature capacitive strontium titanate thermometry. United States. doi:10.1063/1.4955069.
Tinsman, Colin, Li, Gang, Su, Caroline, Asaba, Tomoya, Lawson, Benjamin, Yu, Fan, and Li, Lu. 2016. "Probing the thermal Hall effect using miniature capacitive strontium titanate thermometry". United States. doi:10.1063/1.4955069.
@article{osti_1259741,
title = {Probing the thermal Hall effect using miniature capacitive strontium titanate thermometry},
author = {Tinsman, Colin and Li, Gang and Su, Caroline and Asaba, Tomoya and Lawson, Benjamin and Yu, Fan and Li, Lu},
abstractNote = {},
doi = {10.1063/1.4955069},
journal = {Applied Physics Letters},
number = 26,
volume = 108,
place = {United States},
year = 2016,
month = 6
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4955069

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  • 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{sub 3}). SrTiO{sub 3}more » 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.« less
  • Two-dimensional axisymmetric particle-in-cell simulations with a Monte Carlo collision algorithm (PIC-MCC) have been conducted to investigate the effect of capacitive coupling in a miniature inductively coupled plasma source (mICP) by using two models: an inductive model and a hybrid model. The mICP is 3 mm in radius and 6 mm in height with a three-turn planar coil, where argon plasma is sustained. In the inductive model, the coil is assumed to be electrostatically shielded, and thus the discharge is purely inductive coupling. In the hybrid model, we assume that the different turns of the coil act like electrodes in capacitivemore » discharge to include the effect of capacitive coupling. The voltage applied to these electrodes decreases linearly from the powered end of the coil towards the grounded end. The numerical analysis has been performed for rf frequencies in the range of 100-1000 MHz, and the power absorbed by the plasma in the range of 5-50 mW at a fixed pressure of 500 mTorr. The PIC-MCC results show that potential oscillations at the plasma-dielectric interface are not negligible, and thus the major component of the absorbed power is caused by the axial motion of electrons in the hybrid model, although almost all of the power absorption is due to the azimuthal motion of electrons in the inductive model. The effect of capacitive coupling is more significant at lower rf frequencies and at higher absorbed powers under the calculation conditions examined. Moreover, much less coil currents are required in the hybrid model.« less
  • Barium strontium titanate thin films were deposited by sputtering on Pt/SiO{sub 2} structures using five different host substrates: magnesium oxide, strontium titanate, sapphire, silicon, and vycor glass. These substrates were chosen to provide a systematic change in thermal strain while maintaining the same film microstructure. All films have a weakly textured microstructure. Temperature dependent dielectric measurements from 100-500 K determined that decreasing thermal expansion coefficient of the host substrate (i.e., larger tensile thermal strain) reduced the film dielectric permittivity. The experimentally determined Curie-Weiss temperature decreased with increasing tensile thermal strain and the Curie-Weiss constant increased with tensile strain as predictedmore » by Pertsev et al.« less
  • Thermal, electrical and electrocatalytical properties of LaxSr1-xTiO3, where x=0.1, 0.2, 0.3, 0.35, and 0.4, perovskite compositions are studied in relation to their potential use as solid oxide fuel cell (SOFC) anode materials. An emphasis is made on the effect of oxidation-reduction cycling on these properties. Depending on the dopant amount, x, and the oxygen partial pressure, LaxSr1-xTiO3 possesses an electrical conductivity on the order of 0.01-500 S/cm at 800-1000 degrees C. The thermal expansion of LaxSr1-xTiO3 is close to that of yttria-stabilized zirconia (YSZ). No significant chemical expansion or contraction of LaxSr1-xTiO3 with x < 0.4 is observed when exposedmore » to wide variation in pO2.« less