Tuning the Dimensionality of the Heavy Fermion Compound CeIn
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Shishido, Hiroaki; Shibauchi, T.; Yasu, Kazuki; Kato, Tomonobu; Kontani, Hiroshi; Terashima, Takahito; Matsuda, Yuji

doi:10.1126/science.1183376

Cited by 157 publications

(171 citation statements)

References 26 publications

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“…We expect that the two-dimensional heavy-fermion system studied in this paper can be realized in superlattice systems which have the inversion symmetry. 48 Another possibility is doping topological Kondo insulators; so far, topological Kondo insulators are proposed for some heavyfermion compounds [30][31][32] , which may be described by the half-filled Kondo lattice model. In these systems, we may have a chance to realize a spin-selective topological insulator even in a metallic phase.…”

Section: Discussionmentioning

confidence: 99%

Topological phase in a two-dimensional metallic heavy-fermion system

et al. 2013

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We report on a topological insulating state in a heavy-fermion system away from half-filling, which is hidden within a ferromagnetic metallic phase. In this phase, the cooperation of the RKKY interaction and the Kondo effect, together with the spin-orbit coupling, induces a spin-selective gap, bringing about topologically non-trivial properties. This topological phase is robust against a change in the chemical potential in a much wider range than the gap size. We analyze these remarkable properties by using dynamical mean field theory and the numerical renormalization group. Its topological properties support a gapless chiral edge mode, which exhibits a non-Tomonaga-Luttinger liquid behavior due to the coupling with bulk ferromagnetic spin fluctuations. We also propose that the effects of the spin fluctuations on the edge mode can be detected via the NMR relaxation time measurement.

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Section: Discussionmentioning

confidence: 99%

Topological phase in a two-dimensional metallic heavy-fermion system

et al. 2013

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“…[1][2][3][4][5][6] Thus, it has become feasible to change the electronic structure and tune the properties of f electron materials. This is particularly important when one thinks of the interesting phenomena which can be observed in these materials, such as magnetism, unconventional superconductivity and quantum criticality.…”

Section: Introductionmentioning

confidence: 99%

Magnetism in f -electron superlattices

2016

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We analyze antiferromagnetism in f electron superlattices. We show that the competition between the Kondo effect and the RKKY interaction in f electron materials is modified by the superlattice structure. Thus, the quantum critical point which separates the magnetic phase and the Fermi liquid phase depends on the structure of the f electron superlattice. The competition between the Kondo effect and the RKKY interaction is also reflected in the magnetic interlayer coupling between different f electron layers. We demonstrate that in the case of weak Kondo effect the magnetic interlayer coupling behaves similar to other magnetic heterostructures without Kondo effect. However, close to the quantum phase transition, the dependence of the interlayer coupling on the distance between the f electron layers is modified by the Kondo effect. Another remarkable effect, which is characteristic for f electron superlattice, is that the magnetic interlayer coupling does vanish stepwise depending on the distance between different f electron layers. As a consequence, the quantum critical point depends also stepwise on this distance.

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“…In the superlattice, the electronic structure becomes two-dimensional, which is expected to stabilize the FFLO phase [8]. Moreover, the three-dimensional magnetic order [12][13][14][15], which is responsible for the perplexing situation in the bulk sample, is expected to be strongly suppressed [4] due to negligibly small RKKY interaction between the adjacent CeCoIn 5 block layers through the YbCoIn 5 spacer. Furthermore, the importance of local inversion symmetry at the interface between CeCoIn 5 and YbCoIn 5 in the superlattice has recently been suggested to play a decisive role in superconducting properties, in particular when the thickness of CeCoIn 5 is only a few unit cells thick [16].…”

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“…Recent advancement in heavy fermion thin film fabrication technology [4,5] has enabled the preparation of superlattices formed by alternate stacking of c-axis oriented CeCoIn 5 and YbCoIn 5 with atomic layer thicknesses. The large Fermi velocity mismatch across the interface between CeCoIn 5 and YbCoIn 5 significantly reduces the transmission probability of quasiparticles, thereby ensuring quasi-two-dimensional superconductivity confined within CeCoIn 5 layers [6,7].…”

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Anomalous Upper Critical Field inCeCoIn5/YbCoIn5Superlattices with a Rashba-Type Heavy Fermion Interface

et al. 2012

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We report a highly unusual angular variation of the upper critical field (Hc2) in epitaxial superlattices CeCoIn5(n)/YbCoIn5(5), formed by alternating layers of n and a 5 unit-cell thick heavy-fermion superconductor CeCoIn5 with a strong Pauli effect and normal metal YbCoIn5, respectively. For the n = 3 superlattice, Hc2(θ) changes smoothly as a function of the field angle θ. However, close to the superconducting transition temperature, Hc2(θ) exhibits a cusp near the parallel field (θ = 0 • ). This cusp behavior disappears for n = 4 and 5 superlattices. This sudden disappearance suggests the relative dominance of the orbital depairing effect in the n = 3 superlattice, which may be due to the suppression of the Pauli effect in a system with local inversion symmetry breaking. Taking into account the temperature dependence of Hc2(θ) as well, our results suggest that some exotic superconducting states, including a helical superconducting state, might be realized at high magnetic fields.PACS numbers: 74.25. Op, 81.15.Hi In the absence of time reversal symmetry or space inversion symmetry, the Fermi surface (FS) can often be split into portions with different spin structures. To stabilize superconductivity under such conditions where spin degeneracy is lifted, unconventional pairing of quasiparticles is needed, leading to exotic superconducting states very different from the conventional BCS pairing state of (k ↑, -k ↓). Considering the situation of the broken time reversal symmetry alone, Fulde and Ferrell [1], and Larkin and Ovchinnikov [2] proposed the pairing state of (k ↑, -k+q ↓) on a Zeeman-split FS. This so-called FFLO pairing state leads to the modulation of the superconducting order parameter in real space with the modulation wavelength of the order of 1/|q|. On the other hand, in the lack of space inversion symmetry, a Rashba-type spin-orbit coupling splits the FS into branches with spins of opposite rotation sense [3]. When the magnetic field is applied to such a system, a pairing state with a finite center-of-mass momentum can also be realized, resulting in a helical superconducting state analogous to the FFLO phase.However, such exotic superconducting states have been poorly explored because of the lack of suitable materials. Recent advancement in heavy fermion thin film fabrication technology [4,5] has enabled the preparation of superlattices formed by alternate stacking of c-axis oriented CeCoIn 5 and YbCoIn 5 with atomic layer thicknesses. The large Fermi velocity mismatch across the interface between CeCoIn 5 and YbCoIn 5 significantly reduces the transmission probability of quasiparticles, thereby ensuring quasi-two-dimensional superconductivity confined within CeCoIn 5 layers [6,7]. This provides a unique opportunity to explore the physics discussed above. This is because bulk CeCoIn 5 with strong Pauli effect has been reported to host the FFLO phase at low temperatures and high magnetic field [8][9][10][11]. In the superlattice, the electronic structure becomes two-dimensional, which is expec...

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Tuning the Dimensionality of the Heavy Fermion Compound CeIn ₃

Cited by 157 publications

References 26 publications

Topological phase in a two-dimensional metallic heavy-fermion system

Topological phase in a two-dimensional metallic heavy-fermion system

Magnetism in f -electron superlattices

Anomalous Upper Critical Field inCeCoIn5/YbCoIn5Superlattices with a Rashba-Type Heavy Fermion Interface

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Tuning the Dimensionality of the Heavy Fermion Compound CeIn 3

Cited by 157 publications

References 26 publications

Topological phase in a two-dimensional metallic heavy-fermion system

Topological phase in a two-dimensional metallic heavy-fermion system

Magnetism in f -electron superlattices

Anomalous Upper Critical Field inCeCoIn5/YbCoIn5Superlattices with a Rashba-Type Heavy Fermion Interface

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Tuning the Dimensionality of the Heavy Fermion Compound CeIn ₃