Are the bulk quantum oscillations in SmB_6 intrinsic? · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title · changed
Revision 1: Are the bulk quantum oscillations in SmB6 intrinsic?
Revision 2: Are the bulk quantum oscillations in $\mathrm{SmB_6}$ intrinsic?
Plain · changed
Revision 1: Some SmB6 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.
Revision 2: 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 · changed · core
Revision 1: In the Kondo insulator SmB6, 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 SmB6.
Revision 2: 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 $\mathrm{SmB_6}$.
Settled by
De Haas-van Alphen and specific-heat oscillation measurements on crystals from several growth methods with inclusion content and Sm vacancy density quantified.
Kind
well-posed
Answer type
yes-no
References
(empty)
Literature status
contested
Status note
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.
Posed since
2014

Decisions