Correlation between Bulk Thermodynamic Measurements and the Low-Temperature-Resistance Plateau in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>SmB</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Phelan, W. Adam; Koohpayeh, S. M.; Cottingham, Patrick; Freeland, J. W.; Leiner, J. C.; Broholm, C.; McQueen, Tyrel M.

doi:10.1103/physrevx.4.031012

Cited by 110 publications

(171 citation statements)

References 61 publications

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“…Fig.7 compares the theoretical and experimental dispersions for the best simple set of parameters we found so far: t f 1 = t f 2 = t d1 = t d2 = 0, t f 3 = 0.171 eV, t d3 = −0.132 eV, ǫ f = 0.035 eV, V 0 = 0.915 eV in the model given by (1), (3) and (28). These are the "microscopic" values.…”

Section: Comparison To Experimentsmentioning

confidence: 96%

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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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Section: Comparison To Experimentsmentioning

confidence: 96%

“…t f RR ′ are the tight-binding hopping integrals of the intrinsic f electron taken from (28). Generally, both hybridized electron labels s and λ are not good quantum numbers beyond the mean-field approximation.…”

Section: Perturbative Calculation Of the Collective Mode Spectrumentioning

confidence: 99%

In-gap collective mode spectrum of the topological Kondo insulatorSmB6

Fuhrman

Nikolić

2014

Phys. Rev. B

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“…Although activated electrical transport is readily inferred from the dramatic temperature-dependent resistivity, at low temperatures the resistivity saturates at a finite value instead of diverging to infinity. This anomalous behavior is now linked to the presence of electrically conducting surface states [8], and many experiments have been directed at determining the topological classification of the material [9][10][11][12][13][14][15][16][17][18][19][20]. A full description of the underlying strongly correlated electron state is key to understanding nontrivial topology in f-electron materials.…”

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confidence: 99%

Pressure-Resistant Intermediate Valence in the Kondo InsulatorSmB6

et al. 2016

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Resonant x-ray emission spectroscopy (RXES) was used to determine the pressure dependence of the f-electron occupancy in the Kondo insulator SmB6. Applied pressure reduces the f-occupancy, but surprisingly, the material maintains a significant divalent character up to a pressure of at least 35 GPa. Thus, the closure of the resistive activation energy gap and onset of magnetic order are not driven by stabilization of an integer valent state. Over the entire pressure range, the material maintains a remarkably stable intermediate valence that can in principle support a nontrivial band structure.

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“…Carrying out the momentum integral, we find 20) where τ φ is the phase coherence time and we assumed τ −1…”

Section: B Wal Correction To Conductivitymentioning

confidence: 99%

Nonuniversal weak antilocalization effect in cubic topological Kondo insulators

et al. 2015

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We study the quantum correction to conductivity on the surface of cubic topological Kondo insulators with multiple Dirac bands. We consider the model of time-reversal invariant disorder which induces the scattering of the electrons within the Dirac bands as well as between the bands. When only intraband scattering is present we find three long-range diffusion modes leading to weak antilocalization correction to conductivity which remains independent of the microscopic details such as Fermi velocities and relaxation times. Interband scattering gaps out two diffusion modes leaving only one long-range mode. We find that depending on the value of the phase coherence time, either three or only one long-range diffusion modes contribute to weak localization correction rendering the quantum correction to conductivity non-universal. We provide an interpretation for the results of the recent transport experiments on samarium hexaboride where weak antilocalization has been observed.

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Correlation between Bulk Thermodynamic Measurements and the Low-Temperature-Resistance Plateau inSmB6

Cited by 110 publications

References 61 publications

In-gap collective mode spectrum of the topological Kondo insulatorSmB6

In-gap collective mode spectrum of the topological Kondo insulatorSmB6

Pressure-Resistant Intermediate Valence in the Kondo InsulatorSmB6

Nonuniversal weak antilocalization effect in cubic topological Kondo insulators

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