Anisotropic heat conduction in the spin-spiral state of the cubic helimagnet ZnCr<sub>2</sub>Se<sub>4</sub>
POSTER
Abstract
The complex magnetic phase diagrama of ZnCr2Se4 includes a quantum critical pointb separating spin-spiral (1.5 ≤ B ≤ 6.5 T) and field-polarized (B > 6.5 T) phases. We present thermal conductivity measurements at T ≤ TN = 21 K in the spin-spiral phase which exhibit anisotropy at T < 2 K, for heat flow along and transverse to the spin-helix propagation direction, that is nonmonotonic in field. Calculated lattice and magnon thermal conductivities that employ a three-dimensional magnon dispersion inferred from neutron scattering studiesc,d favor a magnonic interpretation of the data.
a A. S. Cameron et al., J. Phys.: Condens. Matter 28, 146001 (2016).
b C. C. Gu et al., Phys. Rev. Lett. 120, 147204 (2018).
c Y. V. Tymoshenko et al., Phys. Rev. X 7, 041049 (2017).
d D. S. Inosov et al., arXiv:2009.13424v1
a A. S. Cameron et al., J. Phys.: Condens. Matter 28, 146001 (2016).
b C. C. Gu et al., Phys. Rev. Lett. 120, 147204 (2018).
c Y. V. Tymoshenko et al., Phys. Rev. X 7, 041049 (2017).
d D. S. Inosov et al., arXiv:2009.13424v1
*This material is based on work supported by the U.S. DOE, Off. of BES, Div. of Mater. Sci. and Eng., under grant No. DE-SC0008607 (Univ. Miam), the German Research Foundation (DFG) through the Collaborative Research Center SFB 1143 in Dresden [projects C03 (D. S. I.) and A06 (S. R.), research grant IN 209/4-1, and the Trans-regional Collaborative Research Center TRR 80 (Augsburg, Munich, Stuttgart).
Presenters
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Joshua L Cohn
- Univ of Miami