<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mtext>A</mml:mtext><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>27</mml:mn></mml:mrow></mml:mmultiscripts><mml:mtext>l</mml:mtext></mml:mrow></mml:math>NMR study of the mixed valence compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CeFe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Al</mm

Chen, S. C.; Lue, Chin‐Shan

doi:10.1103/physrevb.81.075113

Cited by 47 publications

(73 citation statements)

References 29 publications

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“…The value of the peak position can be taken as a measure of the spin gap energy in these compounds [37]. The spin gap energy of 8 meV is in good agreement with the value determined from the exponential behavior of the observed magnetic susceptibility, specific heat and NMR studies [11,21,22]. Further in x=0.3 and 0.5 the magnetic scattering broadens and the intensity is considerably reduced compared to x=0.…”

Section: (4) Inelastic Neutron Scattering Studysupporting

confidence: 80%

Competing4f-electron dynamics in Ce(Ru1−xFex)<

et al. 2013

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We have carried out muon spin relaxation (SR), neutron diffraction and inelastic neutron scattering (INS) investigations on polycrystalline samples of Ce(Ru 1-x Fe x ) 2 Al 10 (x=0, 0.3, 0.5, 0.8 and 1) to investigate the nature of the ground state (magnetic ordered versus paramagnetic) and the origin of the spin gap formation as evident from the bulk measurements in the end members. Our zero-field SR spectra clearly reveal coherent two-frequency oscillations at low temperature in x=0, 0.3 and 0.5 samples, which confirms the long-range magnetic ordering of the Ce-moment with T N =27, 26 and 21 K respectively. On the other hand the SR spectra of x=0.8 and x=1 down to 1.4 K and 0.045 K, respectively exhibit a temperature independent KuboToyabe term confirming a paramagnetic ground state. The long-range magnetic ordering in x=0.5 below 21 K has been confirmed through the neutron diffraction study. INS measurements of x=0 2 clearly reveal the presence of a sharp inelastic excitation near 8 meV between 5 K and 26 K, due to an opening of a gap in the spin excitation spectrum, which transforms into a broad response at and above 30 K. Interestingly, at 4.5 K the spin gap excitation broadens in x=0.3 and exhibits two clear peaks at 8.4(3) and 12.0(5) meV in x=0.5. In the x=0.8 sample, which remains paramagnetic down to 1.2 K, there is a clear signature of a spin gap of 10-12 meV at 7 K, with a strong Q-dependent intensity. Evidence of a spin gap of 12.5(5) meV has also been found in x=1.The observation of a spin gap in the paramagnetic samples (x=0.8 and 1) is an interesting finding in this study and it challenges our understanding of the origin of the semiconducting gap in CeT 2 Al 10 (T=Ru and Os) compounds in terms of hybridization gap opening only a small part of the Fermi surface, gapped spin waves, or a spin-dimer gap.

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Section: (4) Inelastic Neutron Scattering Studysupporting

confidence: 80%

Competing4f-electron dynamics in Ce(Ru1−xFex)<

et al. 2013

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“…The electronic structure investigations of superconducting iron chalcogenides, both theoretical [24,25,26,27,28] and experimental [8,25,31,30,32], have shown that the multi-gap nature of their SC may be connected with interband interactions between the holelike β and electronlike δ Fermi surface (FS) sheets. In particular, SC can be mediated by antiferromagnetic spin fluctuations (SF), observed experimentally by e.g.…”

Section: Introductionmentioning

confidence: 99%

Strain effects on the electronic structure of the FeSe0.5Te0.5 superconductor

Winiarski¹,

Samsel‐Czekała²,

Ciechan³

2013

Journal of Alloys and Compounds

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The electronic structure of the strained FeSe 0.5 Te 0.5 superconductor has been investigated from first principles. Our calculation results indicate that the influence of hydrostatic, biaxial or uniaxial compressive stress on the density of states at the Fermi level is insignificant. The overall shape of the Fermisurface (FS) nesting function for FeSe 0.5 Te 0.5 at ambient pressure resembles that of its parent compound, FeSe, but under the ab-plane compressive strain. In these two systems, changes of their FSs under various stress conditions are qualitatively almost the same. However, in FeSe 0.5 Te 0.5 the intensity of the perfect Q = (0.5, 0.5) × (2π/a) nesting vector is more diminished. These findings are in good agreement with former experimental data and support the idea of spin-fluctuation mediated superconductivity in iron chalcogenides.

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“…So far, the electronic structure of CeFe 2 Al 10 has been discussed by two groups. One was by Chen and Lue, who used a 27 Al-nuclear magnetic resonance (NMR) experiment, 23) and the other was Kawamura et al, who used a 27 Al-nuclear quadrupole resonance (NQR) experiment. 24) Both groups have proposed a symmetric density of states at E F with the band width of 140 ± 40 K (= 11 ± 3 meV) and with the energy gap of 125 ± 15 K (= 10±2 meV).…”

Section: 17)mentioning

confidence: 99%

Anisotropic Electronic Structure of the Kondo Semiconductor CeFe₂Al₁₀Studied by Optical Conductivity

2011

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We report temperature-dependent polarized optical conductivity [σ(ω)] spectra of CeFe2Al10, which is a reference material for CeRu2Al10 and CeOs2Al10 with an anomalous magnetic transition at 28 K. The σ(ω) spectrum along the b-axis differs greatly from that in the ac-plane, indicating that this material has an anisotropic electronic structure. At low temperatures, in all axes, a shoulder structure due to the optical transition across the hybridization gap between the conduction band and the localized 4f states, namely c-f hybridization, appears at 55 meV. However, the gap opening temperature and the temperature of appearance of the quasiparticle Drude weight are strongly anisotropic indicating the anisotropic Kondo temperature. The strong anisotropic nature in both electronic structure and Kondo temperature is considered to be relevant the anomalous magnetic phase transition in CeRu2Al10 and CeOs2Al10.

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A27lNMR study of the mixed valence compoundCeFe2Al

Cited by 47 publications

References 29 publications

Competing4f-electron dynamics in Ce(Ru1−xFex)<

Competing4f-electron dynamics in Ce(Ru1−xFex)<

Strain effects on the electronic structure of the FeSe0.5Te0.5 superconductor

Anisotropic Electronic Structure of the Kondo Semiconductor CeFe₂Al₁₀Studied by Optical Conductivity

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A27lNMR study of the mixed valence compoundCeFe2Al

Cited by 47 publications

References 29 publications

Competing4f-electron dynamics in Ce(Ru1−xFex)<

Competing4f-electron dynamics in Ce(Ru1−xFex)<

Strain effects on the electronic structure of the FeSe0.5Te0.5 superconductor

Anisotropic Electronic Structure of the Kondo Semiconductor CeFe2Al10Studied by Optical Conductivity

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Product

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Anisotropic Electronic Structure of the Kondo Semiconductor CeFe₂Al₁₀Studied by Optical Conductivity