Low-temperature spin-Seebeck effect in the helimagnetic insulator Cu<sub>2</sub>OSeO<sub>3</sub>

ORAL

Abstract

We report measurements of the longitudinal spin-Seebeck coefficient (σLSSE) in single crystalsa of the helimagnetic insulator Cu2OSeO3 (with 10-nm thick Pt contacts) for the temperature range 0.5 K ≤ T ≤15 K. The magnitude of the maximum σLSSE ≈ 20 μV/K at T=5-6 K is the largest known for insulating magnets, consistent with the unprecedentedly large magnon thermal conductivity reported for this compound.b The temperature dependence of σLSSE as well as the applicability of various spin-Seebeck theories will be discussed.

a J. Panella, B. A. Trump, G. G. Marcus, T. M. McQueen, Cryst. Growth Des. 17, 4944-8 (2017).

b N. Prasai, B. A. Trump, G. G. Marcus, A. Akopyan, S. X. Huang, T. M. McQueen, and J. L. Cohn, Phys. Rev. B 95, 224407 (2017).

*This material is based on work supported by the U.S. DOE, Off. of BES, Div. of Mater. Sci. and Eng., under grant Nos. DEFG02-12ER46888 (Miami), DEFG02-08ER46544 (JHU), and the NSF, Div. of Mater. Res., Sol. St. Chem., CAREER grant No. DMR-1253562 (JHU).

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Presenters

  • Artem Akopyan

    • Physics, Univ of Miami

Authors

  • Artem Akopyan

    • Physics, Univ of Miami

  • Narayan Prasai

    • Physics, Univ of Miami

  • Joshua Cohn

    • Physics, Univ of Miami

  • Benjamin Trump

    • NIST Center for Neutron Research
    • Johns Hopkins University

  • Guy Marcus

    • Johns Hopkins University

  • Tyrel McQueen

    • Johns Hopkins University
    • Institute for Quantum Matter, Johns Hopkins University
    • Department of Chemistry , Johns Hopkins University
    • The Johns Hopkins University