Anisotropy of the thermal expansion of titanium due to proximity to an electronic topological transition
Nizhankovskii V. I., Katsnel'son M. I., Peschanskikh G. V., Trefilov A. V.
It has been found that the thermal expansion of titanium is anisotropic in the temperature interval 10=еГ<160 К. Specifically, the expansion coefficient is negative along the hexagonal axis and positive in the basal plane. This anisotropy is explained in terms of a particular feature of the electronic structure of titanium: proximity to electronic topological transitions.