Dynamics of the coherent ground state in intermediate-valent<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>YbB</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math>

Gorshunov, B.; Haas, P.; Ушаков, О. В.; Dressel, Martin; Iga, Fumitoshi

doi:10.1103/physrevb.73.045207

Cited by 19 publications

(21 citation statements)

References 45 publications

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“…Within the single electron model these values correspond to an extremely large effective mass of charge carriers m * ≈ 250m 0 . The estimated relaxation time τ = m * µ H /e ≈ 0.6 ps agrees well with inverse valence fluctuation rate τ ≈ 0.4 ps estimated from optical and neutron studies [2,11]. Finally, the very good correlation between the sum N 0 + n 0 ≈ 0.036 and the Tm concentration (≈ 0.04) favors the nonequivalent states of substitute ions, which may appear due to their various positions in respect of the ytterbium dimers [9,10].…”

Section: Resultssupporting

confidence: 85%

“…The nature of the narrow gap (ε g ≈ 17.8 meV [1,2]) in YbB 12 , which shares the place between antiferromagnetic metal TmB 12 [3] and superconducting LuB 12 [4] in the set of rare-earth dodecaborides RB 12 , stays a subject of discussions [1][2][3][5][6][7][8][9][10][11]. The ground state of YbB 12 identified usually as the Kondo insulator [1] seems to have a non-trivial topology of the band structure resulting in surface conductivity [5].…”

Section: Introductionmentioning

confidence: 99%

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Charge Transport and Magnetism in Tm_0.03Yb_0.97B₁₂

et al. 2017

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Transport and magnetic properties of polycrystalline Tm0.03Yb0.97B12 samples were investigated at temperatures 1.8-300 K in magnetic fields up to 9 T. The activated behavior of resistivity, the Hall coefficient and thermopower is described in terms of a narrow gap εg ≈ 16.6 meV, which controls the charge transport in Tm0.03Yb0.97B12 at T > 40 K. The maximum of magnetic susceptibility found at 50 K is shown to be induced by a spin gap ∆ ≈ 4.7 meV being close to the half of the spin fluctuation energy in YbB12. Large diffusive thermopower S = AT , A = −29.1 µV/K 2 and the Pauli susceptibility χ0 ≈ 7.2 × 10 −3 emu/mol found below 20 K seem to be associated with the many-body resonance, which corresponds to states with an enhanced effective mass m * ≈ 250m0 (m0 -free electron mass). The effective parameters of magnetic centers and the analysis of anomalies favor the nonequivalent states of substitute Tm ions.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Charge Transport and Magnetism in Tm_0.03Yb_0.97B₁₂

et al. 2017

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“…However, in contrast to the strong magnetic field dependence of the 11 B NMR 1/T 1 maximum and µSR relaxation rate in this temperature range, the field dependence of this very small specific heat hump is almost negligible up to 140 kOe. Lastly, we note that there is a similar 2.7 meV electronic excitation [45] and an analogous field-dependent 11 B NMR 1/T 1 maximum [46] in YbB 12 , suggesting the sources of the intrinsic low-T magnetism in these two candidate TKIs are the same.…”

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confidence: 85%

Intrinsic Low-Temperature Magnetism in SmB6

et al. 2019

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By means of new muon spin relaxation (µSR) experiments, we disentangle extrinsic and intrinsic sources of low-temperature bulk magnetism in the candidate topological Kondo insulator (TKI) SmB6. Results on Al-flux grown SmB6 single crystals are compared to those on a large floatingzone grown 154 Sm 11 B6 single crystal in which a 14 meV bulk spin exciton has been detected by inelastic neutron scattering (INS). Below ∼ 10 K we detect the gradual development of quasistatic magnetism due to rare-earth impurities and Sm vacancies. Our measurements also reveal two additional forms of intrinsic magnetism: 1) underlying low-energy (∼ 100 neV) weak magnetic moment (∼ 10 −2 µB) fluctuations similar to those detected in the related candidate TKI YbB12 that persist down to millikelvin temperatures, and 2) magnetic fluctuations consistent with a 2.6 meV bulk magnetic excitation at zero magnetic field that appears to hinder surface conductivity above ∼ 4.5 K. We discuss potential origins of the magnetism.

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“…states have been reported in SCES semiconductors (not only SmB 6 [6] 15 and YbB 12 [7] but also Ce 3 Bi 4 Pt 3 [8] and FeSi [9]). Various theoretical approaches have been proposed to interpret the evolution of the 'large' and 'small' gaps as well as the VF behavior by means of the Wigner lattice model [10], the exciton-polaron model [11] and the Anderson lattice model at halffilling [12].…”

mentioning

confidence: 99%