Local-density prediction of the Fermi surface of UBe13

The linearized augmented-plane-wave method has been applied to calculate the Fermi surface (FS) of U${\mathrm{Be}}_{13}$. In spite of having $14f$ bands within about 1 eV of the Fermi level, the calculated FS is surprisingly simple. The $X$-centered pieces have band masses $m_b=3m-4m$, while the two $\Gamma$-centered orbits have masses of the order of $m$ and $3m$. Comparison of the band density of states with the specific-heat density of states suggests some of the bands have effective masses of $300m-400m$.