Electronic structure and optical spectra of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LuInCu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Yb</mml:mi><mml:mi>M</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</

Antonov, V. N.; Galli, Mattéo; Marabelli, F.; Yaresko, A. N.; Perlov, A. Ya.; Bauer, E.

doi:10.1103/physrevb.62.1742

Cited by 49 publications

(39 citation statements)

References 45 publications

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“…Therefore, in addition to the agreement of experiment and theory regarding the direction of the T K dependence of n and ω th , the sensitivity of the dependence of n and ω th on T K are in reasonable agreement with each other. In addition, the numerical values for B are reasonable bandwidths for the InAgCu d-orbital derived band states 26,57 of YbIn 1−x Ag x Cu 4 . Thus we conclude that the observed dependences of both n and ω th on T K is consistent with the predictions of the periodic Anderson model in magnitude as well as direction.…”

Section: Discussion Tk Scalingmentioning

confidence: 54%

“…In YbIn 1−x Ag x Cu 4 , increasing x from 0 to 1 corresponds to the net removal of 2 electrons (per formula unit) from the system, hence we expect the Fermi level to move downward in energy as x is increased. Relativistic band structure calculations addressing these changes have been carried out by Antonov et al 26 . In this scenario, optical features involving transitions from filled states just below E F tend to weaken and move upward as x is increased and these states are emptied 63 .…”

Section: Discussion High Frequency Interband Transitionsmentioning

confidence: 99%

“…This approach may be too nuanced because in a general mixed valent system, bare f -to-conduction state transitions can be appreciable, and in fact are expected to be important in YbIn 1−x Ag x Cu 4 . This is because the conduction band states are derived primarily from Cu-InAg p and d orbitals 26 , whereas the f electrons sit on Yb sites. This physical displacement between the underlying orbital states is manifest in the banded states through nonvanishing dipole transition matrix elements, |p f c | 52 .…”

Section: Modeling Kubo-greenwood Analysismentioning

confidence: 99%

“…In concert the carrier concentration increases markedly and the resistance drops 2 . Extensive experimentation has revealed substantial changes in specific heat 8,17,18 , elastic constants 6,17 , single-particle (photoemission) 19,20,21,22,23 , two-particle (optical) 24,25,26,27 and neutron 5 spectroscopies.Changes associated with the phase transition in YbInCu 4 are generally interpreted as an effective screening of the localized Yb 4f moments in the low temperature phase. This is associated with an order of magnitude…”

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confidence: 99%

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Infrared dynamics ofYbIn1−xAgxCu4: Kondo scaling, sum rules, and temperature dependence

et al. 2006

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We present an infrared/optical study of the dynamics of the strongly correlated electron system YbIn1−xAgxCu4 as a function of doping and temperature for x ranging from 0 to 1, and T between 20 and 300 K. This study reveals information about the unusual phase transition as well as the phases themselves. Scaling relations emerge from the data and are investigated in detail using a periodic Anderson model based calculation. We also provide a picture in which to view both the low and high-energy x -dependent features of the infrared data, including identification of high energy, temperature dependent features.When exploring the complex terrain of correlated electron phases, one is often interested in the phase boundaries separating systems which are controlled by different physics. In the low doping regime (x<0.2) of YbIn 1−x Ag x Cu 4 , a temperature-driven, first-order electronic phase transition separates two phases which are characterized by widely disparate effective energy scales (T K ) associated with the effects of hybridization between the localized Yb f -electrons and the itinerant conduction electrons. This rapid change provides both an opportunity to identify and isolate features associated with many-body hybridization physics and raises fundamental questions regarding the origin of the transition itself.The valence transition in YbInCu 4 has been examined with a variety of experimental techniques 1,2,3,4,5,6,7 , and exhibits some similarities 8,9,10 to phase transitions observed in certain rare-earth intermetallic compounds 11,12 . Samples of high quality can be made, and provide the only known example of a valence transition occurring at ambient pressure in a stoichiometric sample. The synthesis of high quality single crystal samples has allowed the detailed study of the phase diagram of YbIn 1−x Ag x Cu 4 , and continued effort has revealed a tendency of the system to order ferromagnetically as the phase transition temperature is driven to zero either by pressure 13,14 or Y doping 13,15 . The presence of interesting phase competition in a system where the sample chemistry is well controlled enhances our interest in this correlated electron system. Figure 1 shows a schematic representation of the phase diagram of YbIn 1−x Ag x Cu 4 . At low doping, a line of first order phase transitions separates a low temperature, mixed-valent phase and a high temperature local moment phase. In YbInCu 4 (x=0) at high temperature (T > T v = 42 K), the magnetic response exhibits a Curie-Weiss form with magnitude appropriate to j = 7/2 moment of Yb and a small Weiss temperature 16 Θ W ∼ −13 K, which constrains the effective Kondo temperature appropriate in this high temperature range to be comparably small in magnitude. The resistivity in this temperature range 2 is very high for a metal (ρ dc ≃ 150µΩ-cm) and together with Hall measurements indicate a very low (hole) carrier concentration 2 . Lowering the temperature through the first order phase transition has dramatic effects on both the spin and charge response. For...

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Section: Discussion Tk Scalingmentioning

confidence: 54%

Section: Discussion High Frequency Interband Transitionsmentioning

confidence: 99%

Section: Modeling Kubo-greenwood Analysismentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Infrared dynamics ofYbIn1−xAgxCu4: Kondo scaling, sum rules, and temperature dependence

et al. 2006

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10.1007/s11451-008-1001-8

2010

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This paper reports on the measurements of the thermal conductivity κ and electrical resistivity ρ in the temperature range 5-300 K and the heat capacity at constant pressure C p in the range 80-300 K for the metallic nonmagnetic compound LuMgCu 4 . The experimental values of κ and C p for the LuMgCu 4 compound are compared with the corresponding data available in the literature for the light heavy-fermion compound YbMgCu 4 . It is shown that, in the low-temperature range (5-20 K), the phonon thermal conductivity κ ph of YbMgCu 4 is lower than κ ph of LuMgCu 4 as a result of phonon scattering from magnetic moment fluctuations of the Yb 4 f electrons and, conversely, the heat capacity of LuMgCu 4 in the range 80-300 K is lower than that of YbMgCu 4 because the heat capacity of the latter compound has an additional magnetic component.

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Electronic and optical properties of Yb-based 1-2-20 materials

Berdecia,

Ekuma

2024

Computational Materials Science

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Electronic structure and optical spectra ofLuInCu4andYbMCu4

Cited by 49 publications

References 45 publications

Infrared dynamics ofYbIn1−xAgxCu4: Kondo scaling, sum rules, and temperature dependence

Infrared dynamics ofYbIn1−xAgxCu4: Kondo scaling, sum rules, and temperature dependence

10.1007/s11451-008-1001-8

Electronic and optical properties of Yb-based 1-2-20 materials

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