Are the bulk quantum oscillations in $\mathrm{SmB_6}$ intrinsic?
In plain words
Some $\mathrm{SmB_6}$ crystals show magnetization oscillations typical of metal electrons although their resistance says the bulk is insulating. Other groups attribute the oscillations to surface states or to aluminum inclusions left from crystal growth.
Precise statement
In the Kondo insulator $\mathrm{SmB_6}$, de Haas-van Alphen oscillations were reported as two-dimensional surface signals (Li et al. 2014) and as three-dimensional bulk signals with large Fermi surfaces and anomalous low-temperature amplitude growth (Tan et al. 2015, floating-zone crystals); in flux-grown crystals oscillations were traced to embedded Al (2018-2019). Determine whether bulk oscillations exist in stoichiometric, inclusion-free $\mathrm{SmB_6}$.
What would settle it
De Haas-van Alphen and specific-heat oscillation measurements on crystals from several growth methods with inclusion content and Sm vacancy density quantified.
Status in the literature
Specific-heat oscillations at the torque frequencies (LaBarre et al., Journal of Physics: Condensed Matter 34, 36LT01, 2022) support a bulk thermodynamic origin in some crystals; dependence on growth method persists.
Parent problems
- Special case of Do Kondo insulators host charge-neutral fermions with a Fermi surface? · open · from revision 1 SmB6 bulk oscillations are the SmB6 instance of the Kondo-insulator neutral-fermion question The parent was revised since revision 1: it now states another question.
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