Magnetic impurities in Kondo insulators: An application to samarium hexaboride

  title={Magnetic impurities in Kondo insulators: An application to samarium hexaboride},
  author={Wesley T. Fuhrman and P. Nikoli'c},
  journal={Physical Review B},
Impurities and defects in Kondo insulators can have an unusual impact on dynamics that blends with effects of intrinsic electron correlations. Such crystal imperfections are difficult to avoid, and their consequences are incompletely understood. Here we study magnetic impurities in Kondo insulators via perturbation theory of the s-d Kondo impurity model adapted to small bandgap insulators. The calculated magnetization and specific heat agree with recent thermodynamic measurements in samarium… Expand
6 Citations

Figures from this paper

Properties of the donor impurity band in mixed valence insulators
  • B. Skinner
  • Materials Science, Physics
  • Physical Review Materials
  • 2019
In traditional semiconductors with large effective Bohr radius, an electron donor creates a hydrogen-like bound state just below the conduction band edge. The properties of the impurity band arisingExpand
Metallic islands in the Kondo insulator SmB6
The predicted interplay between Kondo physics and non-trivial topology in SmB$_{6}$ has stimulated many experimental reports, some of which are in apparent contradiction. The origin of the disputeExpand
Bulk and Surface Properties of SmB6
Samarium hexaboride crystallizes in a simple cubic structure (space group #221, Pm-3m), but its properties are far from being straightforward. Initially classified as a Kondo insulator born out ofExpand
Bulk transport paths through defects in floating zone and Al flux grown SmB6
We investigate the roles of disorder on low-temperature transport in SmB$_6$ crystals grown by both the Al flux and floating zone methods. We used the inverted resistance method with Corbino geometryExpand
Hall anomaly, quantum oscillations and possible Lifshitz transitions in Kondo insulator YbB$_{12}$: evidence for unconventional charge transport
  • Ziji Xiang, Kuan-Wen Chen, +10 authors Lu Li
  • Physics
  • 2021
Ziji Xiang, Kuan-Wen Chen, Lu Chen, Tomoya Asaba, Yuki Sato, Nan Zhang, Dechen Zhang, Yuichi Kasahara, Fumitoshi Iga, William A. Coniglio, Yuji Matsuda, John Singleton, Lu Li Department of Physics,Expand
Intrinsic Bulk Quantum Oscillations in a Bulk Unconventional Insulator SmB6
Evidence is examined for the intrinsic character of bulk quantum oscillations in floating zone-grown single crystals of SmB6 that have been the subject of quantum oscillation studies and for the similarity of the Fermi surface in insulating SmB 6 with the conduction-electron FermI surface in metallic hexaborides. Expand


Screened moments and extrinsic in-gap states in samarium hexaboride
G gadolinium is used to exemplify that hard to avoid impurities introduce a low energy density of states that may explain earlier observations, and a relationship between specific heat and impurity moment screening which scales systematically is found. Expand
Topological surface state in the Kondo insulator samarium hexaboride.
Thickness-dependent transport measurements on doped SmB6 are reported, and it is shown that magnetic and non-magnetic doping results in contrasting behaviour that supports the conclusion that SmB 6 shows virtually no residual bulk conductivity. Expand
Excitons in topological Kondo insulators: Theory of thermodynamic and transport anomalies in SmB_{6}.
It is shown that TKIs are susceptible to the formation of excitons and magnetoexcitons, which can account for long-standing anomalies in SmB_{6}. Expand
Direct observation of the spin texture in SmB6 as evidence of the topological Kondo insulator.
These results provide strong evidence that SmB6 can host topological surface states in a bulk insulating gap stemming from the Kondo effect, which can serve as an ideal platform for investigating of the interplay between novel topological quantum states with emergent effects and competing orders induced by strongly correlated electrons. Expand
Magnetic Impurity in Insulators with Small Energy Gap
Static and dynamic properties of a magnetic impurity in insulators with a small energy gap are investigated by the poor man's scaling, 1/ N expansion, the self-consistent perturbation method withinExpand
Fermi surfaces in Kondo insulators.
A rich spectrum of theoretical models is suggested to explain the origin across different Kondo insulating families of a bulk Fermi surface potentially from novel itinerant quasiparticles that couple to magnetic fields, yet do not couple to weak DC electric fields. Expand
Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB 6
As an exemplary Kondo insulator, SmB6 has been studied for several decades. However, direct evidence for the development of the Kondo coherent state and for the evolution of the electronic structureExpand
Surface electronic structure of the topological Kondo-insulator candidate correlated electron system SmB6.
The authors' observed in-gap Fermi surface oddness tied with the Kramers' point topology, their coexistence with the two-dimensional transport anomaly in the Kondo hybridization regime, as well as their robustness against thermal recycling, collectively provide strong evidence for protected surface metallicity with a Fermani surface whose topology is consistent with the theoretically predicted topological FermI surface. Expand
Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
Kondo insulator samarium hexaboride (SmB6) has been intensely studied in recent years as a potential candidate of a strongly correlated topological insulator. One of the most exciting phenomenaExpand
Correlation between Bulk Thermodynamic Measurements and the Low-Temperature-Resistance Plateau in SmB 6
Topological insulators are materials characterized by dissipationless, spin-polarized surface states resulting from non-trivial band topologies. Recent theoretical models and experiments suggest thatExpand