In many three-dimensional metals with inversion symmetry and a weak spin-orbit interaction, Dirac points of the electron energy spectrum form band-contact lines in the Brillouin zones of these crystals, and electron topological transitions of 31/2 kind are due to certain points on these lines. We theoretically study these transitions in detail and point out that they can be detected with magnetic susceptibility which exhibits a giant diamagnetic anomaly at the 31/2-order transitions.
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