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Anomalous nernst effects in pyrochlore molybdates with spin chirality.

N Hanasaki1, K Sano, Y Onose

  • 1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

Physical Review Letters
|March 21, 2008
PubMed
Summary

Spin chirality in pyrochlore molybdates drives the transverse thermoelectric (Nernst) effect. This effect, observed in Nd2Mo2O7 and Sm2Mo2O7, is absent in materials lacking spin chirality, highlighting its crucial role.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Physics

Background:

  • The transverse thermoelectric (Nernst) effect is a key phenomenon in understanding electron transport in magnetic materials.
  • Pyrochlore molybdates are a class of materials exhibiting complex magnetic and electronic properties.
  • Spin chirality, a property related to the cyclic ordering of electron spins, is hypothesized to influence thermoelectric responses.

Purpose of the Study:

  • To experimentally investigate the transverse thermoelectric (Nernst) effect in pyrochlore molybdates.
  • To determine the role of spin chirality in the observed Nernst signal.
  • To correlate the Nernst effect with other transport properties like Hall conductivity.

Main Methods:

  • Experimental measurements of the transverse thermoelectric (Nernst) effect.
  • Characterization of pyrochlore molybdate samples, including Nd2Mo2O7, Sm2Mo2O7, and (Gd0.95Ca0.05)2Mo2O7.
  • Analysis of the temperature dependence of the Nernst signal.
  • Correlation analysis between Nernst signal and Hall conductivity.

Main Results:

  • A distinct low-temperature (20-30 K) positive extremum in the Nernst signal was observed in Nd2Mo2O7 and Sm2Mo2O7, materials possessing spin chirality.
  • The Nernst signal was found to be absent in (Gd0.95Ca0.05)2Mo2O7, a material lacking significant spin chirality.
  • A strong correlation between Hall conductivity (sigma xy) and the transverse Peltier coefficient (alpha xy) was identified in Nd2Mo2O7.

Conclusions:

  • Spin chirality plays a significant role in inducing and enhancing the spontaneous (anomalous) Nernst effect in pyrochlore molybdates.
  • The experimental results support the theoretical link between spin chirality and transverse thermoelectric phenomena.
  • Further research into spin-chiral materials could lead to novel thermoelectric applications.