Structural parameters for the suspected pressure-induced electron transition in InBi

Lattice parameters and atomic positions for InBi have been measured at pressures up to 25.6 kbars by time-of-flight neutron powder diffraction. The structure remains tetragonal ($P4/\mathrm{nmm}$). However, the compression along the $a$ direction is largest at low pressures and exhibits a broad minimum around 14 kbars which appears to be accompanied by a change in the pressure dependence of individual In-Bi and Bi-Bi nearest-neighbor distances. These observations are consistent with a pressure-induced electron transition involving the disappearance of a hole pocket upon increasing pressure.