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Spin Seebeck effect at low temperatures in the nominally paramagnetic insulating state of vanadium dioxide

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arxiv 2208.12284 v1 pith:TQ5ITGL6 submitted 2022-08-25 cond-mat.str-el cond-mat.mtrl-sci

Renjie Luo , Xuanhan Zhao , Liyang Chen , Tanner J. Legvold , Henry Navarro , Ivan K. Schuller , Douglas Natelson This is my paper · ORCID
classification cond-mat.str-elcond-mat.mtrl-sci
keywords spinseebeckparamagneticresponsevanadiumdioxideinsulatingmagnetic
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The low temperature monoclinic, insulating phase of vanadium dioxide is ordinarily considered nonmagnetic, with dimerized vanadium atoms forming spin singlets, though paramagnetic response is seen at low temperatures. We find a nonlocal spin Seebeck signal in VO2 films that appears below 30 K and which increases with decreasing temperature. The spin Seebeck response has a non-hysteretic dependence on in-plane external magnetic field. This paramagnetic spin Seebeck response is discussed in terms of prior findings on paramagnetic spin Seebeck effects and expected magnetic excitations of the monoclinic ground state.

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