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SmB$_6$ exhibits a small (15-20 meV) bandgap at low temperatures due tohybridized $d$ and $f$ electrons, a tiny (3 meV) transport activation energy$(E_{A})$ above 4 K, and surface states accessible to transport below 2 K. Westudy its magnetoresistance in 60-T pulsed fields between 1.5 K and 4 K. Theresponse of the nearly $T$-independent surface states (which show noShubnikov-de Haas oscillations) is distinct from that of the activated bulk.$E_{A}$ shrinks by 50% under fields up to 60 T. Data up to 93 T suggest thatthis trend continues beyond 100 T, in contrast with previous explanations. Itrules out emerging theories to explain observed exotic magnetic quantumoscillations.

Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields