Quantum criticality near the upper critical field of Ce<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>PdIn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>8</mml:mn></mml:msub></mml:math>

Tokiwa, Yutaka; Gegenwart, P.; Gnida, D.; Kaczorowski, D.

doi:10.1103/physrevb.84.140507

Cited by 23 publications

(34 citation statements)

References 37 publications

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“…Most intriguingly, it has also been suggested that Ce 2 PdIn 8 may fulfill the necessary conditions for the formation of a unique modulated Fulde-Ferrell-Larkin-Ovchinnikov superconducting state [6], which possible occurrence at the magnetic highfield-low-temperature corner of the H − T phase diagram of CeCoIn 5 is presently being hotly debated [11]. The many common features between CeCoIn 5 and Ce 2 PdIn 8 motivate further comprehensive studies of the physical behavior in the latter compound.In this Communication we report on the Hall effect and the transverse magnetoresistivity of Ce 2 PdIn 8 , which both appeared highly anomalous yet consistent with the quantum criticality scenario, previously evoked based on the electrical resistivity [5,6,8], thermoelectric [12] and heat capacity [4,9] data. The polycrystalline sample used in the present study was previously characterized by means of X-ray diffraction, magnetic susceptibility, electrical resistivity and heat capacity measurements [5].…”

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confidence: 86%

Anomalous magnetotransport in the heavy-fermion superconductor Ce2PdIn8

2012

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The normal state behavior in the heavy-fermion superconductor Ce2PdIn8 has been probed by means of Hall coefficient (RH) and transverse magnetoresistivity (M R) measurements. The results indicate the predominance of contributions from antiferromagnetic spin fluctuations at low temperatures. Anomalous non-Fermi-liquid-like features, observed below 8 K in both RH(T ) and M R(T ), are related to underlying quantum critical point, evidenced before in the specific heat and the electrical resistivity data. The magnetotransport in Ce2PdIn8 is shown to exhibit specific types of scaling that may appear universal for similar systems at the verge of magnetic instability.PACS numbers: 74.70. Tx, 74.40.Kb, 75.20.Hr, 72.15.Qm In the vicinity of quantum critical point (QCP), which separates an ordered from disordered phase at zero temperature, the finite-temperature physical properties of heavy fermion (HF) systems are notably different from those predicted by the standard Fermi liquid (FL) theory of metals. As far as the magnetotransport properties are concerned, quantum criticality in two-dimensional (2D) antiferromagnetic (AF) systems manifests itself as a linear-in-T electrical resistivity (ρ), strongly temperature-and field-dependent R H , and M R obeying the so-called modified Kohler's rule [1].There is still growing number of HF superconductors since the seminal discovery of unconventional superconductivity in CeCu 2 Si 2 [2]. Recently, a compound Ce 2 PdIn 8 has been identified as an ambient-pressure HF superconductor with strongly enhanced normal-state electronic specific heat coefficient γ ≃ 1.2 J/(mol K 2 ) and the transition temperature T c ≃ 0.7 K [3][4][5]. The superconductivity in this material has been found to possess a nodal character [6], likely of d-wave type, doubtlessly established for the closely related phase CeCoIn 5 [7]. Furthermore, Ce 2 PdIn 8 has been found to exhibit a magnetic-field induced QCP near the upper critical field H c2 (0) = 2.4 T [6,8,9], again in strong similarity to CeCoIn 5 [10]. Most intriguingly, it has also been suggested that Ce 2 PdIn 8 may fulfill the necessary conditions for the formation of a unique modulated Fulde-Ferrell-Larkin-Ovchinnikov superconducting state [6], which possible occurrence at the magnetic highfield-low-temperature corner of the H − T phase diagram of CeCoIn 5 is presently being hotly debated [11]. The many common features between CeCoIn 5 and Ce 2 PdIn 8 motivate further comprehensive studies of the physical behavior in the latter compound.In this Communication we report on the Hall effect and the transverse magnetoresistivity of Ce 2 PdIn 8 , which both appeared highly anomalous yet consistent with the quantum criticality scenario, previously evoked based on the electrical resistivity [5,6,8], thermoelectric [12] and heat capacity [4,9] data. The polycrystalline sample used in the present study was previously characterized by means of X-ray diffraction, magnetic susceptibility, electrical resistivity and heat capacity measurements [5]. Detailed metal...

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confidence: 86%

Anomalous magnetotransport in the heavy-fermion superconductor Ce2PdIn8

2012

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“…The most studied member of this series is the n = 1 member CeCoIn 5 (T c = 2.3 K) (16), in which clear evidence for non-FL behaviors in the normal state (17,18) and nodal superconductivity has been found (6,19,20). The recent discovery of superconductivity at ambient pressure in the n = 2 member Ce 2 PdIn 8 (T c = 0.68 K) (21), which exhibits very similar non-FL properties (22)(23)(24)(25)(26)(27) to those in CeCoIn 5 , allows a detailed comparison of the superconducting properties to extract common features in these superconductors near the antiferromagnetic QCP.…”

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confidence: 99%

Anomalous superfluid density in quantum critical superconductors

Hashimoto

Mizukami

Katsumata

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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When a second-order magnetic phase transition is tuned to zero temperature by a nonthermal parameter, quantum fluctuations are critically enhanced, often leading to the emergence of unconventional superconductivity. In these "quantum critical" superconductors it has been widely reported that the normal-state properties above the superconducting transition temperature T c often exhibit anomalous non-Fermi liquid behaviors and enhanced electron correlations. However, the effect of these strong critical fluctuations on the superconducting condensate below T c is less well established. Here we report measurements of the magnetic penetration depth in heavy-fermion, iron-pnictide, and organic superconductors located close to antiferromagnetic quantum critical points, showing that the superfluid density in these nodal superconductors universally exhibits, unlike the expected T-linear dependence, an anomalous 3/2 power-law temperature dependence over a wide temperature range. We propose that this noninteger power law can be explained if a strong renormalization of effective Fermi velocity due to quantum fluctuations occurs only for momenta k close to the nodes in the superconducting energy gap Δ(k). We suggest that such "nodal criticality" may have an impact on low-energy properties of quantum critical superconductors. T he physics of materials located close to a quantum critical point (QCP) are an important issue because the critical fluctuations associated with this point may produce unconventional high-temperature superconductivity (1, 2). Quantum oscillations (3, 4) and specific heat measurements (5) have shown that, in some systems, as the material is tuned toward the QCP by controlling an external parameter such as doping, pressure, or magnetic field, the effective mass strongly increases due to enhanced correlation effects. Along with this the temperature dependence of the resistivity shows a strong deviation from the standard AT 2 dependence in the Fermi liquid (FL) theory of metals and often shows an anomalous T-linear behavior that corresponds to the A coefficient diverging as zero temperature is approached.Although there are many studies of non-FL behavior in the normal metallic state (1, 2), relatively little is known about how the QCP affects the superconducting properties below the critical temperature T c . The superconducting dome often develops around the putative QCP so that when the temperature is lowered below T c , the superconducting order parameter starts to develop and the Fermi surface becomes gapped. It is therefore natural to consider that the low-energy quantum critical fluctuations are quenched by the formation of the superconducting gap Δ, which means that the system avoids the anomalous singularities associated with the QCP. Perhaps because of this reasoning the superconducting properties are usually analyzed by the conventional theory without including temperature/field-dependent renormalization effects resulting from the proximity to the QCP. For example, in refs. 6 and 7 the NMR relaxat...

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“…This implies a similar degree of hybridization between the f and conduction electrons. The detected effective masses are, however, by far too small to account for the huge value of the electronic specific heat coefficient, γ, of the order of 1 J/K 2 mol just above the superconducting transition [4,5,9]. Presumably, the effective masses of the β branches, which are not observed here, are strongly enhanced.…”

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“…While the observed dHvA oscillations in Ce 2 PdIn 8 are not strong enough to perform the field-dependent analysis of the effective masses, they can also be expected to decrease with magnetic field. This assumption is supported by the experimentally observed field dependence of the T 2 -coefficient in the resistivity [6] and of the Sommerfeld coefficient of the specific heat [9] above the upper critical field.…”

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confidence: 68%

“…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].…”

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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...

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Quantum criticality near the upper critical field of Ce2PdIn8

Cited by 23 publications

References 37 publications

Anomalous magnetotransport in the heavy-fermion superconductor Ce2PdIn8

Anomalous magnetotransport in the heavy-fermion superconductor Ce2PdIn8

Anomalous superfluid density in quantum critical superconductors

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

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