Electronic structure of YbGa<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>.</mml:mo><mml:mn>15</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Si<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>0</mml:mn><mml:mo>.</mml:mo><mml:mn>85</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and YbGa<mml:math xmlns:mml="http://www.w3.org/1998

Yamaoka, H.; Jarrige, Ignace; Tsujii, Naohito; Imai, Motoharu; Lin, Jung Fu; Matsunami, Masaharu; Eguchi, Ritsuko; Arita, Masashi; Shimada, Kenya; Namatame, H.; Takeuchi, Masaki; Taguchi, M.; Senba, Yasunori; Ohashi, Haruhiko; Hiraoka, Nozomu; Ishii, Hirofumi; Tsuei, Ku Ding

doi:10.1103/physrevb.83.104525

Cited by 15 publications

(18 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5(c) along with the intensity ratio of Yb 2+ to Yb 3+ estimated from the fit of the RXES spectra at hν = 8938 eV. 2,23,24 Our estimate of the Yb valence at 20 K is in good agreement with a previous paper (Yb valence of 2.91 ± 0.03) that used conventional XAS. 11 It is noted that higher valences in hard x-ray bulk-sensitive XAS studies are often obtained compared with the PES estimations as described below.…”

Section: Temperature Dependencesupporting

confidence: 88%

“…2,[22][23][24] The undulator beam was monochromatized by a pair of cryogenically cooled Si(111) crystals and was focused to a size of 30 (horizontal) × 40 (vertical) μm 2 at the sample position using toroidal and Kirkpatrick-Baez mirrors. The incident photon flux was estimated to be about 10 13 photons/s at 8.94 keV from the measurement by using a pin diode (type S3590-09).…”

Section: A Experiments and Analysesmentioning

confidence: 99%

“…1,2 Such physical properties are closely related to the interaction between the 4f and the conduction electrons, which leads to either an ordering of the local moments through the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction or a screening of the local moments due to the Kondo effect. [3][4][5] Ternary compounds R 2 T 2 M (R: rare earth, T : transition metal, M: Cd, In, Sn, and Pb) are attracting much attention because of their rich variety of exotic physical phenomena, which are seemingly linked to the competition between the RKKY and the Kondo interactions.…”

Section: Introductionmentioning

confidence: 99%

“…The temperature dependence of the Yb valence is derived using a combination of RXES and x-ray absorption spectroscopy in the partial fluorescence mode (PFY-XAS). 2,[22][23][24] Resonant PES in both UV and SX energy regions is also performed. We compare the multiplet structure of the photoelectron spectra with the density of states (DOS) calculated using a combination of density-functional theory in the local density approximation (LDA), dynamical mean-field theory (DMFT), and the Hubbard-I approximation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electronic structure and the valence state ofYb2Pd2SnandYbPd
Yamaoka
¹
,
Thunström
²
,
Tsujii
³

et al. 2012
Phys. Rev. B
Self Cite
9
0
5
0
View full text Add to dashboard Cite

We have examined the electronic structure of the heavy fermion Yb 2 Pd 2 Sn in comparison with the superconductor YbPd 2 Sn by means of high-resolution photoelectron spectroscopy (PES) and resonant x-ray emission spectroscopy (RXES). The PES data are interpreted in light of the density of states calculated within the local density approximation plus the dynamical mean-field theory. Our analysis of the RXES data shows that the valence of Yb in Yb 2 Pd 2 Sn is weakly fluctuating, indicating weak but finite c-f hybridization, and decreases slightly with temperature. In contrast, the Yb valence in YbPd 2 Sn is nearly 3 + and does not show any temperature dependence, suggesting that the Yb 4f electrons are localized and the superconductivity is due to the Pd conduction electrons. The constant initial state spectra at the Yb 4d-4f resonance for Yb 2 Pd 2 Sn clearly show resonant behavior for Yb 3+ and antiresonance for Yb 2+ , indicating that the Yb 3+ and Yb 2+ states are intimately correlated.

show abstract

Section: Temperature Dependencesupporting

confidence: 88%

Section: A Experiments and Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electronic structure and the valence state ofYb2Pd2SnandYbPd
Yamaoka
¹
,
Thunström
²
,
Tsujii
³

et al. 2012
Phys. Rev. B
Self Cite
9
0
5
0
View full text Add to dashboard Cite

show abstract

“…Ultimately, we suggest that our analysis can serve as a prototype for understanding the general mechanism of delocalization in f electron materials.The PFY-XAS measurements were carried out at room temperature at the Taiwan beamline BL12XU, SPring-8. Details of the experimental setup have been published elsewhere [7]. For each compound, a fragment of single crystal of ∼100 µm in size was loaded into the sample chamber of a Be gasket with silicone oil used as pressure transmitting medium.…”

mentioning

confidence: 99%

Unified understanding of the valence transition in the rare-earth monochalcogenides under pressure

et al. 2013

View full text Add to dashboard Cite

Valence instability is a key ingredient of the unusual properties of f electron materials, yet a clear understanding is lacking as it involves a complex interplay between f electrons and conduction states. Here we propose a unified picture of pressure-induced valence transition in Sm and Yb monochalcogenides, considered as model system for mixed valent 4f -electron materials. Using high-resolution x-ray absorption spectroscopy, we show that the valence transition is driven by the promotion of a 4f electron specifically into the lowest unoccupied (LU) 5d t2g band. We demonstrate with a promotional model that the nature of the transition at low pressures is intimately related to the density of states of the LU band, while at high pressures it is governed by the hybridization strength. These results set a new standard for the generic understanding of valence fluctuations in f -electron materials. PACS numbers: 71.20.Eh, 78.70.Ck, 75.20.Hr Valence fluctuations play an essential role in some of the f -electron systems most exciting behaviors, such as quantum criticality and unconventional superconductivity [1,2]. But their understanding has proven challenging to capture in a unified theory because they arise from subtle many-body interactions between the f electrons and the conduction states [3,4]. Pressure on the other hand is an efficient way to act on f -electron interactions and localization and thus can serve as a window onto the f -electron physics. Notably, the pressure-induced valence transition of the lanthanide monochalcogenides is a paradigmatic illustration of f delocalization phenomena and their tremendous diversity. For instance, SmS undergoes a first-order transition to near-trivalency coinciding with the onset of magnetic ordering [5], whereas the transition of YbS into an intermediate-valent correlated metal is extremely sluggish [6]. These diverse behaviors, while establishing a severe test bed for theoretical understanding of f -electron systems, have been overlooked for the past decades. Here, we address them in the light of a direct measurement of the electronic structure of Sm and Yb monochalcogenides (SmS, SmSe, SmTe, YbS, YbSe) under pressure performed using highresolution x-ray absorption spectroscopy in the partial fluorescence yield (PFY-XAS) mode. Our data reveal that the valence discontinuity and concomitant closing of the gap under pressure are caused by the specific filling of the lowest unoccupied (LU) 5d t 2g band by a 4f electron, offering a unified picture of electron delocalization and intermediate valency. Using a promotional model, we show that both the steepness and the amplitude of the valence transition of the Sm compounds increase with the density of states (DOS) of this LU band. When exceeding a critical DOS, the transition becomes first order for SmS. The model fails to describe the prolonged transition of the Yb compounds, which suggests that at high pressures the valence transition is impeded by enhanced hybridization. Ultimately, we suggest that our analysis can serve ...

show abstract

The promise of resonant inelastic X-ray scattering for modern Kondo physics

Hancock

Jarrige

2016

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

Developments in synchrotron accelerator and end station capabilities have brought new techniques to bear on complex matter. The recently-enabled technique of resonant inelastic X-ray scattering (RIXS) has emerged as a serious contender of inelastic neutron scattering as a probe of magnetic structure in correlated electronic materials, but can also reveal perspectives on electronic structural not attainable by optical conductivity or angle-resolved photoemission. Here we introduce the basics of this powerful technique and discuss the prospects to turn this probe onto the charge excitations in Kondo lattice systems.

show abstract

Electronic structure of YbGa1.15Si0.85and YbGa
H. Yamaoka
¹
,
Ignace Jarrige
²
,
Naohito Tsujii
³

et al.

Cited by 15 publications

References 56 publications

Electronic structure and the valence state ofYb2Pd2SnandYbPd
Yamaoka
¹
,
Thunström
²
,
Tsujii
³

et al. 2012
Phys. Rev. B
Self Cite
9
0
5
0
View full text Add to dashboard Cite

Electronic structure and the valence state ofYb2Pd2SnandYbPd
Yamaoka
¹
,
Thunström
²
,
Tsujii
³

et al. 2012
Phys. Rev. B
Self Cite
9
0
5
0
View full text Add to dashboard Cite

Unified understanding of the valence transition in the rare-earth monochalcogenides under pressure

The promise of resonant inelastic X-ray scattering for modern Kondo physics

Contact Info

Product

Resources

About

Electronic structure of YbGa1.15Si0.85and YbGaH. Yamaoka1, Ignace Jarrige2, Naohito Tsujii3 et al.

Cited by 15 publications

References 56 publications

Electronic structure and the valence state ofYb2Pd2SnandYbPdYamaoka1, Thunström2, Tsujii3 et al. 2012Phys. Rev. BSelf Cite9050View full textAdd to dashboardCite

Electronic structure and the valence state ofYb2Pd2SnandYbPdYamaoka1, Thunström2, Tsujii3 et al. 2012Phys. Rev. BSelf Cite9050View full textAdd to dashboardCite

Unified understanding of the valence transition in the rare-earth monochalcogenides under pressure

The promise of resonant inelastic X-ray scattering for modern Kondo physics

Contact Info

Product

Resources

About

Electronic structure of YbGa1.15Si0.85and YbGa
H. Yamaoka
¹
,
Ignace Jarrige
²
,
Naohito Tsujii
³

et al.

Electronic structure and the valence state ofYb2Pd2SnandYbPd
Yamaoka
¹
,
Thunström
²
,
Tsujii
³

et al. 2012
Phys. Rev. B
Self Cite
9
0
5
0
View full text Add to dashboard Cite

Electronic structure and the valence state ofYb2Pd2SnandYbPd
Yamaoka
¹
,
Thunström
²
,
Tsujii
³

et al. 2012
Phys. Rev. B
Self Cite
9
0
5
0
View full text Add to dashboard Cite