PbTaSe2 is a unique topological material, in which the number of nodal lines is expected to change at the structural transition between the lower temperature/pressure "L" phase and the higher temperature/pressure "H" phase. We report the anomalous Nernst effect attributed to the Berry curvature of nodal lines and its change with the structural transition. In the L phase, the Nernst coefficient (Syx) shows the step-like magnetic field dependence reminiscent of the anomalous Nernst effect of nonmagnetic Dirac/Weyl semimetals. By applying hydrostatic pressure, we discovered that the amplitude of the anomalous component significantly decreases at the transition to the H phase, which might correspond to the partial annihilation of nodal line structures.
@article{arxiv.2112.00282,
title = {Anomalous Nernst Effect in Nonmagnetic Nodal Line Semimetal PbTaSe$_2$},
author = {K. Yokoi and H. Murakawa and H. Sakai and N. Hanasaki},
journal= {arXiv preprint arXiv:2112.00282},
year = {2022}
}