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Osmium, the least compressible metal, has recently been observed to undergoabrupt changes in the c/a ratio at extreme pressures. These are claimed toprovide evidence for two unusual electronic behaviors: a crossing of thesemicore 4f and 5p levels, and an electronic topological transition. Wedemonstrate that these two electronic phenomena are readily reproduced andunderstood in density functional theory, but that neither perturbs the trend inc/a ratio against pressure. Hence the observed anomalies in c/a must haveanother cause. Osmium is also notable for its high yield stress: the c/aanomalies lie well within the differential strains which osmium can support. Wepropose that observed c/a changes can arise from mechanical yield ofcrystallites with strong preferred orientation under high deviatoric stress inthe experimental data. We discuss what evidence remains for the more generalhypothesis that core-level overlap under pressure can have measurable effectson the crystal structure in any material.

Detectability of core level crossing and electronic topological transformations: the case of Osmium