Magnetic excitations in intermediate-valence semiconductors with a singlet ground state

Kikoin, K.; Mishchenko, А. S.

doi:10.1088/0953-8984/7/2/008

Cited by 58 publications

(55 citation statements)

References 19 publications

(5 reference statements)

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“…From the above analysis, in conjunction with the neutron and Raman results, we propose that this in-gap resonance can be understood based on the singlet wave function describing [31]. This is consistent with the decrease of magnetic susceptibility starting from T ~ 50 K in Fig.…”

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confidence: 83%

Emergence of a Coherent In-Gap State in theSmB6Kondo Insulator Revealed by Scanning Tunneling Spectroscopy

et al. 2014

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We use scanning tunneling microscopy to investigate the (001) surface of cleaved SmB 6 Kondo insulator. Variable temperature dI/dV spectroscopy up to 60 K reveals a gap-like density of state suppression around the Fermi level, which is due to the hybridization between the itinerant Sm 5d band and localized Sm 4f band. At temperatures below 40 K, a sharp coherence peak emerges within the hybridization gap near the lower gap edge. We propose that the in-gap resonance state is due to a collective excitation in magnetic origin with the presence of spin-orbital coupling and mixed valence fluctuations. These results shed new lights on the electronic structure evolution and transport anomaly in SmB 6 .

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confidence: 83%

Emergence of a Coherent In-Gap State in theSmB6Kondo Insulator Revealed by Scanning Tunneling Spectroscopy

et al. 2014

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“…Similar theoretical descriptions have been proposed in the past, both from the intermediate-valence 47 and localized moment 4,11,48 points of view. We improve on these studies in multiple ways.…”

Section: Introductionsupporting

confidence: 73%

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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“…14. ±ÓÇAEÔÕÂÄÎÇÐËÇ AEÄÖØÝâÏÐÑÅÑ ÒÑÕÇÐÙËÂÎÂ U f AEÎâ ÔÎÂÃÑÔÄâÊÂÐ-ÐÑÅÑ àÎÇÍÕÓÑÐÂ f-ÑÃÑÎÑÚÍË ÔÂÏÂÓËâ, ÓÂÔÒÓÇAEÇÎÈÐÐÑÅÑ ÏÇÉAEÖ AEÄÖÏâ ÍÑÐ×ËÅÖÓÂÙËâÏË, f 5 Ë f 6 , Ä ÔÑÑÕÄÇÕÔÕÄËË Ô àÍÔËÕÑÐÐÑÌ ÏÑAEÇÎßá [54]. [011]…”

Section: ±çóçïçððââ äâîçðõðñôõßunclassified

Neutron spectroscopy and strongly correlated electrons: a view from the inside

Alekseev¹

2017

Usp. Fiz. Nauk

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Magnetic excitations in intermediate-valence semiconductors with a singlet ground state

Cited by 58 publications

References 19 publications

Emergence of a Coherent In-Gap State in theSmB6Kondo Insulator Revealed by Scanning Tunneling Spectroscopy

Emergence of a Coherent In-Gap State in theSmB6Kondo Insulator Revealed by Scanning Tunneling Spectroscopy

In-gap collective mode spectrum of the topological Kondo insulatorSmB6

Neutron spectroscopy and strongly correlated electrons: a view from the inside

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