Thickness dependence of the ground-state properties of thin films of the heavy-fermion compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeCu</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Groten, D.; Baarle, G. J. C. van; Aarts, J.; Nieuwenhuys, G. J.; Mydosh, J. A.

doi:10.1103/physrevb.64.144425

Cited by 8 publications

(9 citation statements)

References 35 publications

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“…Starting from an incoherent dilute limit of Kondo impurities, one possibility to study how the lattice effects come into play is to increase the concentration of magnetic ions [28][29][30][31][32][33][34][35]. However, the electronic structure of bulk HF materials is essentially three dimensional, and one may wonder how the coherence phenomena are affected either by reduced dimensionality or in spatially restricted geometries where both quantum fluctuations and correlations effect are enhanced [36,37]. In this respect, the experimental realization of artificial f -electron superlattices [38] has opened a new avenue to investigate the onset of coherence in a two-dimensional (2D) regime followed up by theoretical studies [39].…”

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Emergent Coherent Lattice Behavior in Kondo Nanosystems

Raczkowski

Assaad

2019

Phys. Rev. Lett.

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How many magnetic moments periodically arranged on a metallic surface are needed to generate a coherent Kondo lattice behavior? We investigate this fundamental issue within the particle-hole symmetric Kondo lattice model using quantum Monte Carlo simulations. Extra magnetic atoms forming closed shells around the initial impurity induce a fast splitting of the Kondo resonance at the inner shells which signals the formation of composite heavy-fermion bands. The onset of the hybridization gap matches well the enhancement of antiferromagnetic spin correlations in the plane perpendicular to the applied magnetic field, a genuine feature of the coherent Kondo lattice. In contrast, the outermost shell remains dominated by a local Kondo physics with spectral features resembling the single-impurity behavior. arXiv:1809.00930v3 [cond-mat.str-el]

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confidence: 99%

Emergent Coherent Lattice Behavior in Kondo Nanosystems

Raczkowski

Assaad

2019

Phys. Rev. Lett.

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“…As shown in the inset of Fig. 1, T coh decreases with increasing 1/n, indicating that reduced dimensionality dramatically suppresses the Kondo coherence [21]. It is unlikely that the crystal electric field at Ce-site changes significantly in the superlattices, because 3 it is mainly determined by the neighboring Ce, In, and Rh ions.…”

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Tuning the Magnetic Quantum Criticality of Artificial Kondo SuperlatticesCeRhIn5/YbRhIn5

et al. 2016

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The effects of reduced dimensions and the interfaces on antiferromagnetic quantum criticality are studied in epitaxial Kondo superlattices, with alternating n layers of heavy-fermion antiferromagnet CeRhIn 5 and 7 layers of normal metal YbRhIn 5 . As n is reduced, the Kondo coherence temperature is suppressed due to the reduction of effective Kondo screening. The Néel temperature is gradually suppressed as n decreases and the quasiparticle mass is strongly enhanced, implying dimensional control toward quantum criticality. Magnetotransport measurements reveal that a quantum critical point is reached for n = 3 superlattice by applying small magnetic fields. Remarkably, the anisotropy of the quantum critical field is opposite to the expectations from the magnetic susceptibility in bulk CeRhIn 5 , suggesting that the Rashba spin-orbit interaction arising from the inversion symmetry breaking at the interface plays a key role for tuning the quantum criticality in the two-dimensional Kondo lattice. 1In Kondo lattices consisting of a periodic array of localized spins which are coupled to conduction electrons, a very narrow conduction band is formed at sufficiently low temperatures through the Kondo effect [1]. Such systems are realized in intermetallic heavy-fermion metals, which contain a dense lattice of certain lanthanide (4f ) and actinide (5f ) ions. In particular, in Ce(4f )-based compounds, strong electron correlations strikingly enhance the quasiparticle (QP) effective mass to about 100 times or more of the bare electron mass, resulting in a heavy Fermi liquid state. In the strongly correlated electron systems, nonFermi liquid behavior, associated with the quantum fluctuations near a quantum critical point (QCP), a point at which a material undergoes a second-order transition from one phase to another at absolute zero temperature [2], has been one of the central issues. The heavy-fermion systems are particularly suitable for this study, because the ground state can be tuned readily by control parameters other than temperature, such as magnetic field, pressure, or chemical substitution [3]. As a result of the many-body effects within the narrow band in these heavy-fermion compounds, a plethora of fascinating properties have been reported in the vicinity of a QCP.Recently, a state-of-the-art molecular beam epitaxy (MBE) technique has been developed to fabricate an artificial Kondo superlattice, a superlattice with alternating layers of Ce-based heavy-fermion compounds and nonmagnetic conventional metals with a few atomic layers thick [4]. These artificially engineered materials provide a new platform to study the properties of two-dimensional (2D) Kondo lattices, in contrast to the three-dimensional bulk materials. In the previously studied CeCoIn 5 /YbCoIn 5 superlattices [4], where CeCoIn 5 is a heavy-fermion superconductor and YbCoIn 5 is a conventional metal, each Ce-block layer (BL) is magnetically decoupled from the others, since the Ruderman-Kittel-Kasuya-Yoshida interaction between the spatially se...

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“…A few exceptions include UPd 2 Al 3 superconductor, which has been prepared as an epitaxial thin film, 14,15 and nonsuperconducting CeCu 6 thin films, which have been prepared in polycrystalline forms by a magnetron sputtering method. 16 Thin films are important to fabricate various heterostructures including S/I/S, S/N/S, and junctions, 17 and have various advantages to study the fundamental physical properties in the superconducting state of CeCoIn 5 .…”

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