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.
@article{arxiv.2208.12284,
title = {Spin Seebeck effect at low temperatures in the nominally paramagnetic insulating state of vanadium dioxide},
author = {Renjie Luo and Xuanhan Zhao and Liyang Chen and Tanner J. Legvold and Henry Navarro and Ivan K. Schuller and Douglas Natelson},
journal= {arXiv preprint arXiv:2208.12284},
year = {2022}
}
Comments
11 pages, 3 figures, + 11 pages and 10 figures of supplemental material