Coherent Heavy Quasiparticles in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Ce</mml:mi><mml:msub><mml:mi>Pt</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>Surface Alloy

Klein, Markus; Nuber, A.; Schwab, H.; Albers, Christina; Tobita, N.; Higashiguchi, M.; Jiang, Jian; Fukuda, Shuichi; Tanaka, Kenichi; Shimada, Kenya; Mulazzi, M.; Assaad, Fakher F.; Reinert, F.

doi:10.1103/physrevlett.106.186407

Cited by 33 publications

(45 citation statements)

References 30 publications

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“…thickness according to Ref. 26, we identify the temperature range T * < ∼ T < T K , T CF as a most interesting one, where we may expect the Ce 4f moments to display a Curie-Weisslike susceptibility with screened moments. We therefore focus on this range in what follows and use the XMCD at the Ce M 4,5 edges to determine the Ce 4f susceptibility and effective paramagnetic moments with the magnetic field aligned along the surface normal 69 .…”

Section: →1 Relmentioning

confidence: 79%

“….10 min. This procedure yields the known, well-ordered and remarkably inert surface reconstructions 18,20,22,[25][26][27] . Over 100 individual preparations were carried out and analyzed.…”

Section: Experimental Methodsmentioning

confidence: 98%

“…On the basis of better resolved datasets, Garnier et al -while not making claims with respect to the underlying alloy composition and atomic structure -unanymously identified a low temperature intensity enhancement near E F as the tail of a Kondo resonance 21,22 . Finally, yet improved experimental conditions allowed Klein et al 26 to observe incipient coherent heavy band formation in the same phase.…”

Section: Introductionmentioning

confidence: 96%

“…Among these, Ce-Pt surface phases on Pt(111) have been repeatedly investigated since the inital report by Tang et al 18 , not only in the attempt to explore correlation physics but also out of interest in their catalytic properties [19][20][21][22][23][24][25][26][27] . The bulk binary Ce-Pt phase diagram 28,29 exhibits various stable intermetallic phases with ground states ranging from a ferromagnetic Kondo lattice with signs of quantum criticality in CePt 30 to low temperature antiferromagnetism with unscreened Ce moments in CePt 5 according to Ref.…”

Section: Introductionmentioning

confidence: 99%

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Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice:CePt5/Pt(111)

et al. 2015

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We present an extensive study of structure, composition, electronic and magnetic properties of Ce-Pt surface intermetallic phases on Pt(111) as a function of their thickness. The sequence of structural phases appearing in low energy electron diffraction (LEED) may invariably be attributed to a single underlying intermetallic atomic lattice. Findings from both microscopic and spectroscopic methods, respectively, prove compatible with CePt5 formation when their characteristic probing depth is adequately taken into account. The intermetallic film thickness serves as an effective tuning parameter which brings about characteristic variations of the Cerium valence and related properties. Soft x-ray absorption (XAS) and magnetic circular dichroism (XMCD) prove well suited to trace the changing Ce valence and to assess relevant aspects of Kondo physics in the CePt5 surface intermetallic. We find characteristic Kondo scales of the order of 10 2 K and evidence for considerable magnetic Kondo screening of the local Ce 4f moments. CePt5/Pt(111) and related systems therefore appear to be promising candidates for further studies of low-dimensional Kondo lattices at surfaces.

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Section: →1 Relmentioning

confidence: 79%

“….10 min. This procedure yields the known, well-ordered and remarkably inert surface reconstructions 18,20,22,[25][26][27] . Over 100 individual preparations were carried out and analyzed.…”

Section: Experimental Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice:CePt5/Pt(111)

et al. 2015

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“…An interesting representative of the latter kind of systems is the interdiffusion-induced binary intermetallic Ce-Pt surface phase CePt 5 with a thickness of few unit cells on a Pt(111) substrate [7,8]. The atomic lattice of the CePt 5 surface layer is based on the CaCu 5 structure, as shown in Fig.…”

mentioning

confidence: 99%

Study of crystal-field splitting in ultrathinCePt5films by Raman spectroscopy

et al. 2017

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Low-temperature electronic properties of rare-earth intermetallics are substantially influenced by the symmetry and magnitude of the crystal electric field. The direct spectroscopic analysis of crystal field splitting can be challenging, especially in low-dimensional systems, because it requires both high spectral resolution and pronounced sensitivity. We demonstrate the eligibility of electronic Raman spectroscopy for this purpose by the direct determination of the 4f level splitting in ultrathin ordered CePt5 films down to 1.7 nm thickness on Pt(111). Crystal field excitations of Ce 4f electrons give rise to Raman peaks with energy shifts up to ≈ 25 meV. Three distinct peaks occur which we attribute to inequivalent Ce sites, located (i) at the interface to the substrate, (ii) next to the Pt-terminated surface, and (iii) in the CePt5 layers in between. The well-resolved Raman signatures allow us to identify a reduced crystal field splitting at the interface and an enhancement at the surface, highlighting its strong dependence on the local atomic environment.

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Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2

Nakamura,

Sugihara,

Chen

et al. 2023

Nat Commun

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The Kondo effect between localized f-electrons and conductive carriers leads to exotic physical phenomena. Among them, heavy-fermion (HF) systems, in which massive effective carriers appear due to the Kondo effect, have fascinated many researchers. Dimensionality is also an important characteristic of the HF system, especially because it is strongly related to quantum criticality. However, the realization of the perfect two-dimensional (2D) HF materials is still a challenging topic. Here, we report the surface electronic structure of the monoatomic-layer Kondo lattice YbCu2 on a Cu(111) surface observed by synchrotron-based angle-resolved photoemission spectroscopy. The 2D conducting band and the Yb 4f state, located very close to the Fermi level, are observed. These bands are hybridized at low-temperature, forming the 2D HF state, with an evaluated coherence temperature of about 30 K. The effective mass of the 2D state is enhanced by a factor of 100 by the development of the HF state. Furthermore, clear evidence of the hybridization gap formation in the temperature dependence of the Kondo-resonance peak has been observed below the coherence temperature. Our study provides a new candidate as an ideal 2D HF material for understanding the Kondo effect at low dimensions.

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Coherent Heavy Quasiparticles in aCePt5Surface Alloy

Cited by 33 publications

References 30 publications

Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice:CePt5/Pt(111)

Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice:CePt5/Pt(111)

Study of crystal-field splitting in ultrathinCePt5films by Raman spectroscopy

Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2

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