Low-energy electrodynamics of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">SmB</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Gorshunov, B.; Sluchanko, N. E.; Волков, А. А.; Dressel, Martin; Knebel, G.; Loidl, A.; Kunii, S.

doi:10.1103/physrevb.59.1808

Cited by 155 publications

(192 citation statements)

References 23 publications

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“…The hybridization energy gap ␦ derived from the fit is twice as large as E g and from previous NMR measurements 17,24 but agrees with the value obtained from conductivity data ͑19 meV͒. 13 The discrepancy could be a result of our crude approximation to the density of states ͑ ͒, which in reality is k-dependent, may contain Van Hove singularities, and is not necessarily symmetric about . Nevertheless, the qualitative predictions are not sensitive to this detail and the present model captures the essential physics of low-temperature relaxation by introducing effects due to field-dependent in-gap states.…”

Section: ͑2͒supporting

confidence: 69%

“…There is evidence for in-gap states in SmB 6 from the T dependence of the optical transmission and reflectivity through films, 12,13 light-scattering ͑Raman͒, 18 neutronscattering experiments, 19,20 and low-T specific heat. 11 The in-gap bound states have only small spectral weight.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a larger gap of 155-220 K has been observed in optical reflectivity data. 12,13 Both gaps are properties of the bulk material and are believed to be a consequence of the hybridization. Similar to other Kondo insulators, such as FeSi, 14 the properties of SmB 6 can be classified using several temperature ranges.…”

Section: Introductionmentioning

confidence: 99%

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High-field suppression of in-gap states in the Kondo insulatorSmB6

et al. 2007

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The controversial ground-state properties of the Kondo insulator SmB 6 have been investigated using 11 B NMR in very high magnetic fields up to 37 T. We find evidence that, following the development of a gap in the conduction-band density of states below 100 K, the in-gap states dominate the nuclear relaxation at temperatures less than 10 K. The Korringa product 1 / K 2 T 1 T exhibits anomalous behavior in this range and the application of high magnetic fields leads to suppression of nuclear relaxation. The hybridization gap, however, remains open up to 37 T. The behavior of the relaxation at low temperatures suggests a strong field dependence of the in-gap states and rules out the possibility that bound states arise from B 6 vacancies. A simple densityof-states model and a band scheme are introduced to account for these observations.

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Section: ͑2͒supporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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High-field suppression of in-gap states in the Kondo insulatorSmB6

et al. 2007

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“…Bulk impurity states pin the chemical potential in the gap. Thus, the bulk properties are characterized by a thermal activation in the resistivity and specific heat with an activation energy of about 4 meV [4,5,6]. However, at temperatures of the order of 4 K the resistivity shows a plateau [7,8] indicative of the presence of surface states at the Fermi-energy [9,10,3,11,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of spin excitons on the surface states of SmB6 : A photoemission study

et al. 2016

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We present the results of high-resolution valence-band photoemission spectroscopic study of SmB6 which shows evidence for a V-shaped density of states of surface origin within the bulk gap. The spectroscopy data is interpreted in terms of the existence of heavy 4f surface states, which may be useful in resolving the controversy concerning the disparate surface Fermi-surface velocities observed in experiments. Most importantly, we 1 find that the temperature dependence of the valence-band spectrum indicates that a small feature appears at a binding energy of about -9 meV at low temperatures. We attribute this feature to a resonance caused by the spin-exciton scattering in SmB6 which destroys the protection of surface states due to time-reversal invariance and spin-momentum locking. The existence of a low-energy spin-exciton may be responsible for the scattering which suppresses the formation of coherent surface quasi-particles and the appearance of the saturation of the resistivity to temperatures much lower than the coherence temperature associated with the opening of the bulk gap.

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“…Kondo insulators are "heavy fermion" materials whose quasiparticle excitations have band-insulating dynamics [1][2][3][4][5][6][7][8][9][10][11] . The most studied Kondo insulator is samarium hexaboride (SmB 6 ), but other similar materials are also known (e.g.…”

Section: Introductionmentioning

confidence: 99%

In-gap collective mode spectrum of the topological Kondo insulatorSmB6

Fuhrman

Nikolić

2014

Phys. Rev. B

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Samarium hexaboride (SmB6) is the first strongly correlated material with a recognized nontrivial band-structure topology. Its electron correlations are seen by inelastic neutron scattering as a coherent collective excitation at the energy of 14 meV. Here we calculate the spectrum of this mode using a perturbative slave boson method. Our starting point is the recently constructed Anderson model that properly captures the band-structure topology of SmB6. Most self-consistent renormalization effects are captured by a few phenomenological parameters whose values are fitted to match the calculated and experimentally measured mode spectrum in the first Brillouin zone. A simple band-structure of low-energy quasiparticles in SmB6 is also modeled through this fitting procedure, because the important renormalization effects due to Coulomb interactions are hard to calculate by ab-initio methods. Despite involving uncontrolled approximations, the slave boson calculation is capable of producing a fairly good quantitative match of the energy spectrum, and a qualitative match of the spectral weight throughout the first Brillouin zone. We find that the "fitted" band-structure required for this match indeed puts SmB6 in the class of strong topological insulators. Our analysis thus provides a detailed physical picture of how the SmB6 band topology arises from strong electron interactions, and paints the collective mode as magnetically active exciton.

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Low-energy electrodynamics ofSmB6

Cited by 155 publications

References 23 publications

High-field suppression of in-gap states in the Kondo insulatorSmB6

High-field suppression of in-gap states in the Kondo insulatorSmB6

Effects of spin excitons on the surface states of SmB6 : A photoemission study

In-gap collective mode spectrum of the topological Kondo insulatorSmB6

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