Fermi-surface evolution in Yb-substituted CeCoIn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>5</mml:mn></mml:msub></mml:math>

Polyakov, A.; Ignatchik, O.; Bergk, B.; Götze, K.; Bianchi, A.; Blackburn, Simon; Prevost, Bobby; Seyfarth, Gabriel; Côté, Michel; Hurt, D.; Capan, C.; Fisk, Z.; Goodrich, R. G.; Sheikin, I.; Richter, Manuel; Wosnitza, J.

doi:10.1103/physrevb.85.245119

Cited by 31 publications

(56 citation statements)

References 42 publications

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“…The reason is that the p-fermions can be formally integrated out, which will lead to the appearance of the self-energy correction Σ a (τ − τ ′ ) in the first term of Eq. (16). However, to keep our expressions compact, we will include this term later when we analyze the transport properties.…”

Section: B Coherent Potential Approximationmentioning

confidence: 99%

“…16 More recently, penetration depth measurements 17 have shown the disappearance of the nodes in the superconducting order parameter for x nom ≥ 0.2. The emergent physical picture which describes the physics of these alloys is based on the notion of coexisting electronic networks coupled to conduction electrons: one is the network of cerium ions in a local moment regime, while the other consists of ytterbium ions in a strongly intermediate-valence regime.…”

Section: Introductionmentioning

confidence: 99%

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Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

et al. 2015

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Here we present our experimental and theoretical study of the effects of pressure on the transport properties of the heavy-fermion alloy Ce1−xYbxCoIn5 with actual concentration x ≈ 0.07. We specifically choose this value of ytterbium concentration because the magnetic-field-induced quantum critical point, which separates the antiferromagnetic and paramagnetic states at zero temperature, approaches zero, as has been established in previous studies. Our measurements show that pressure further suppresses quantum fluctuations in this alloy, just as it does in the parent compound CeCoIn5. In contrast, the square-root temperature dependent part of resistivity remains insensitive to pressure, indicating that the heavy-quasiparticles are not involved in the inelastic scattering processes leading to such a temperature dependent resistivity. We demonstrate that the growth of the coherence temperature with pressure, as well as the decrease of the residual resistivity, can be accurately described by employing the coherent potential approximation for a disordered Kondo lattice.

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Section: B Coherent Potential Approximationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

et al. 2015

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“…We note that the temperature (T coh ) at which resistivity reaches its peak, referred to as coherence temperature in the text, has a minimum as a function of Yb concentration at x ∼ 0.6, signaling the reconstruction of the Fermi surface, in agreement with the recent quantum oscillations experiments. 31 On the other hand, the monotonic dependence 8 of T c on x suggests that the onset of many-body coherence in the lattice of Yb ions diluted with Ce f -moments is decoupled from unconventional superconductivity. Moreover, our observation of the single impurity Kondo behavior of Ce ions in magneto-transport for 0.40 ≤ x ≤ 0.70 points toward an intriguing possibility that unconventional superconductivity has purely local origin and is driven by the presence of Ce f -moments.…”

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confidence: 99%

From local moment to mixed-valence regime inCe1−xYbxCoIn5alloys

et al. 2014

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We investigated the onset of the many-body coherence in the f -orbital single crystalline alloys Ce1−xYbxCoIn5 (0 ≤ x ≤ 0.775) through thermodynamic and magneto-transport measurements. Our study shows the evolution of the many-body electronic state as the Kondo lattice of Ce moments is transformed into an array of Ce impurities. Specifically, we observe a crossover from the predominantly localized Ce moment regime to the predominantly itinerant Yb f -electronic states regime for about 60% of Yb doping. Our analysis of the residual resistivity data unveils the presence of correlations between Yb ions, while from our analysis of specific heat data we conclude that for 0.65 ≤ x ≤ 0.775, Yb f -electrons strongly interact with the conduction electrons while the Ce moments remain completely decoupled. The sub-linear temperature dependence of resistivity across the whole range of Yb concentrations suggest the presence of a unconventional scattering mechanism for the conduction electrons.

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“…Due to the small amplitudes of the [19,20,28]. This implies a similar degree of hybridization between the f and conduction electrons.…”

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confidence: 89%

“…In Ce 2 PdIn 8 , with the two frequencies, α 1 and α 2 , listed in Table I, this yields ∆ = 0.386. The dHvA effect measurements in CeCoIn 5 revealed three extremal cross-section of the quasi-2D FS [19,20,28]. The reported values of the dHvA frequencies are slightly different, yielding the average value of ∆ = 0.221.…”

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confidence: 98%

Quasi-two-dimensional Fermi surfaces of the heavy-fermion superconductorCe2PdIn8

Götze

Klotz²,

Gnida³

et al. 2015

Phys. Rev. B

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We report low-temperature de Haas-van Alphen (dHvA) effect measurements in magnetic fields up to 35 T of the heavy-fermion superconductor Ce2PdIn8. The comparison of the experimental results with band-structure calculations implies that the 4f electrons are itinerant rather than localized. The cyclotron masses estimated at high field are only moderately enhanced, 8 and 14 m0, but are substantially larger than the corresponding band masses. The observed angular dependence of the dHvA frequencies suggests quasi-two-dimensional Fermi surfaces in agreement with band-structure calculations. However, the deviation from ideal two dimensionality is larger than in CeCoIn5, with which Ce2PdIn8 bears a lot of similarities. This subtle distinction accounts for the different superconducting critical temperatures of the two compounds. The appearance of unconventional superconductivity in the vicinity of a quantum critical point (QCP) is a common trend in Ce-based heavy-fermion (HF) compounds. A more recent and still somewhat controversial issue is the influence of the Fermi-surface (FS) dimensionality on unconventional superconductivity. Indeed, reduced dimensionality of the FS leads to nesting-type magnetic instabilities [1] and thus enhances the superconductivity [2,3]. The exact knowledge of the FS topology of HF systems is, therefore, essential. In addition, this information allows distinguishing if the f electrons are itinerant or localized, i.e. whether they contribute to the FS or not.Ce 2 PdIn 8 is a recently discovered HF superconductor with T c = 0.7 K and a non-magnetic ground state [4,5]. Non-Fermi-liquid behavior was observed in both macroscopic [6-10] and microscopic [11,12] measurements at low temperature, implying that Ce 2 PdIn 8 is located very close to a QCP. It was further suggested that a twodimensional (2D) SDW-type QCP is induced by magnetic field near the upper critical field, H c2 ≈ 2 T [9]. Unconventional superconductivity was demonstrated to be due to antiferromagnetic quantum fluctuations [13]. These unusual properties are strikingly similar to those of the well-studied HF superconductor CeCoIn 5 [14-17], which is also located very close to a QCP at ambient pressure. However, the superconducting critical temperature T c = 2.3 K of CeCoIn 5 [18] is considerably higher than that of Ce 2 PdIn 8 .Ce 2 PdIn 8 crystallizes into a tetragonal Ho 2 CoGa 8 -type crystal structure with space group P 4/mmm. It belongs to the larger family of Ce n T In 3n+2 (T : transition metal, n = 1, 2, and ∞) systems, containing a sequence of n CeIn 3 layers intercalated by a T In 2 layer along the c axis. While cubic CeIn 3 (n = ∞) is a completely isotropic system, the layered structures with n = 1 and 2 are expected to lead to anisotropic properties and quasi-2D FSs. Indeed, quasi-2D FS sheets were observed in both n = 1 systems CeCoIn 5 [19,20] [24,25]. The degree of two dimensionality is expected to be larger in monolayer systems with alternating layers of CeIn 3 and T In 2 than in their bilayer counterparts, in which t...

show abstract

Fermi-surface evolution in Yb-substituted CeCoIn5

Cited by 31 publications

References 42 publications

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

From local moment to mixed-valence regime inCe1−xYbxCoIn5alloys

Quasi-two-dimensional Fermi surfaces of the heavy-fermion superconductorCe2PdIn8

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