Energy scales of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Lu</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Yb</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Rh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>by means of ther

Köhler, U.; Oeschler, N.; Steglich, F.; MaQuilon, S.; Fisk, Z.

doi:10.1103/physrevb.77.104412

Cited by 63 publications

(71 citation statements)

References 24 publications

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“…20 At low temperatures the observed S͑T͒ is anisotropic; in zero field, S͑T͒ for ⌬T ʈ c remains negative over the whole temperature range measured, whereas S͑T͒ for ⌬T ʈ ab manifests sign reversals at T SR = 21 and 9.5 K. Sign changes at similar temperatures have been observed in H measurements. 10,11 Figures 3͑a͒ and 3͑b͒ show the low temperature S͑T͒ for ⌬T ʈ ab and ⌬T ʈ c, respectively, in selected fields.…”

Section: Resultssupporting

confidence: 54%

Thermoelectric power investigations of YbAgGe across the quantum critical point

2010

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The magnetic field and temperature dependences of the thermoelectric power (TEP) of the antiferromagnetically ordered heavy fermion compound YbAgGe are measured across the field-induced quantum critical point. These TEP measurements reproduce the earlier H-T phase diagram and identify an additional domelike phase between ∼45and ∼70 kOe. On the low-field side of this region, H>Hc∼45 kOe, the sign of the TEP changes from negative to positive; on the high-field side of this region, H≈70 kOe, a nonFermi-liquid state is evidenced as the logarithmic temperature dependence of S(T)/T, in agreement with previous specific heat results C(T)/T∝−log(T). For higher fields, H>70 kOe, the observed large value of α, S(T)=αT, is indicative of the heavy fermion state and shows a correlation with C(T)/T. Keywords Physics and Astronomy Disciplines Condensed Matter Physics CommentsThis article is from Physical Review B 82 (2010) The magnetic field and temperature dependences of the thermoelectric power ͑TEP͒ of the antiferromagnetically ordered heavy fermion compound YbAgGe are measured across the field-induced quantum critical point. These TEP measurements reproduce the earlier H-T phase diagram and identify an additional domelike phase between ϳ45 and ϳ70 kOe. On the low-field side of this region, H Ͼ H c ϳ 45 kOe, the sign of the TEP changes from negative to positive; on the high-field side of this region, H Ϸ 70 kOe, a non-Fermi-liquid state is evidenced as the logarithmic temperature dependence of S͑T͒ / T, in agreement with previous specific heat results C͑T͒ / T ϰ −log͑T͒. For higher fields, H Ͼ 70 kOe, the observed large value of ␣, S͑T͒ = ␣T, is indicative of the heavy fermion state and shows a correlation with C͑T͒ / T.

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Section: Resultssupporting

confidence: 54%

Thermoelectric power investigations of YbAgGe across the quantum critical point

2010

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“…2 that at T = 0.03 K, S/T abruptly change it sign (the second jump -Jump 2 ), for the hole states vanish. The positive sign of S/T of YbRh 2 Si 2 without the hole states [12] is in agreement with the positive thermopower of its nonmagnetic counterpart LuRh 2 Si 2 , lacking the 4f hole states at µ [21,22,27]. Contrary, at T N L > T > T cr the AF phase transition is of the second order and the entropy is a continuous function at the border of the phase transition.…”

Section: Flat Bands and The Jumps In S/t At The Af Phase Transitionsupporting

confidence: 57%

Scaling behavior of the thermopower of the archetypal heavy-fermion metal YbRh2Si2

et al. 2016

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Scaling behavior of the thermopower of the archetypical heavy-fermion metal We reveal and explain a scaling behavior of the thermopower S/T exhibiting by the archetypical heavy-fermion (HF) metal YbRh2Si2 under the application of magnetic field B at temperatures T . We show that the same scaling is demonstrated by such different HF compounds as β-YbAlB4 and the strongly correlated layered cobalt oxide [BiBa0.66K0.36O2]CoO2. Using YbRh2Si2 as an example, we demonstrate that the scaling behavior of S/T is violated at the antiferromagnetic phase transition, while both the residual resistivity ρ0 and the density of states N experience jumps at the phase transition, making the thermopower experience two jumps and change its sign. Our elucidation is based on flattening of the single-particle spectrum that profoundly affects ρ0 and N . To depict the main features of the S/T behavior, we construct the T − B schematic phase diagram of YbRh2Si2. Our calculated S/T for the HF compounds are in good agreement with experimental facts and support our observations.

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“…The ρ(T ) curve of YbRh 2 Si 2 (not shown) exhibits a broad maximum at T max ≈ 80 K. As was demonstrated [11] by careful resistivity and thermopower measurements on (Lu 1−x Yb x )Rh 2 Si 2 single crystals, this maximum reflects the transition between incoherent and coherent Kondo scattering of the charge carriers off Yb 3+ whose effective 4f -state in the surrounding crystal-electric field (CEF) has a degeneracy greater than two. Upon volume compression by increasing the Lu content a second maximum at lower temperatures becomes apparent which is due to the substantial reduction of the Kondo temperature T K of the CEF ground-state doublet.…”

Section: Magnetoresistivitymentioning

confidence: 49%

“…In this material, the Kondo effect leads to the formation of the composite quasiparticles below the single ion Kondo energy scale of ≈30 K [2,11]. The antiferromagnetic order, however, sets in below a Néel temperature of only T N = 70 mK [12].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Electronic Quantum Criticality in YbRh2Si2

et al. 2010

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The unconventional nature of the quantum criticality in YbRh 2 Si 2 is highlighted on the basis of magnetoresistivity and susceptibility measurements. Results obtained under chemical pressure realized by isoelectronic substitution on the rhodium site are presented. These results illustrate the position of the T -line associated with a breakdown of the Kondo effect near the antiferromagnetic instability in the low-temperature phase diagram. Whereas at zero temperature the Kondo breakdown and the antiferromagnetic quantum critical point coincide in the proximity of the stoichiometric compound, they are seen to be detached under chemical pressure: For positive chemical pressure the magnetically ordered phase extends beyond the T (B)-line. For sufficiently high negative pressure the T (B)-line is separated from the magnetically ordered phase. From our detailed analysis we infer that the coincidence is retained at small iridium concentrations, i.e., at small negative chemical pressure. We outline further measurements which may help to clarify the detailed behavior of the two instabilities.

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Energy scales ofLu1−xYbxRh2Si2by means of ther

Cited by 63 publications

References 24 publications

Thermoelectric power investigations of YbAgGe across the quantum critical point

Thermoelectric power investigations of YbAgGe across the quantum critical point

Scaling behavior of the thermopower of the archetypal heavy-fermion metal YbRh2Si2

Magnetic and Electronic Quantum Criticality in YbRh2Si2

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