Heavy-fermion superconductivity in

Kaczorowski, D.; Gnida, D.; Pikul, Adam; Tran, V.H.

doi:10.1016/j.ssc.2009.12.007

Cited by 41 publications

(58 citation statements)

References 17 publications

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“…[2]). Most recently, the very same T c has been observed for high-quality polycrystalline samples of Ce 2 PdIn 8 [3]. In all cases, the SC transition has been well-defined in both the electrical resistivity and the heat capacity data, while the parameters describing the superconducting state have had values very similar to those reported in Ref.…”

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confidence: 80%

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“…1 and Ref. [3]). These features suggest the presence of antiferromagnetic spin fluctuations and hint at an unconventional character of the superconducting state that possibly emerges in the proximity of a quantum critical point instability, alike in the related HF superconductors CeT In 5 and Ce 2 T In 8 with T = Co, Rh and Ir [4].…”

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confidence: 91%

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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.…”

Section: Resultsmentioning

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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“…2). Measurement on four dierent samples showed a transition at T c = 0.67 K, being attributed to superconductivity in Ce 2 PdIn 8 [3]. The other transition, observed at T m = 1.67 K, shifts to lower temperatures in applied magnetic eld, indicating antiferromagnetic order at the origin of this anomaly (inset in Fig.…”

Section: Resultsmentioning

confidence: 88%

“…While the heavy fermion superconductor Ce 2 PdIn 8 has been thoroughly studied since the rst synthesis [2,3], the Ce 3 PdIn 11 and Ce 5 Pd 2 In 19 compounds were discovered only recently [4], and represent a new structure types of the series. Both structure types can be viewed as n blocks of CeIn 3 alternating with m blocks of PdIn 2 along the c-axis.…”

Section: Introductionmentioning

confidence: 99%

Solution Growth and Investigation of the Single Crystals from the CePdIn System

2014

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We report on the investigation of recently discovered heavy fermion compounds within the Ce-Pd-In system. Single crystals of CenPdmIn3n+2m (n = 2, 3, 5; m = 1, 2) and Ce4Pd10In21 were synthesized from In-ux. Specic heat measurements of the multiphase CenPdmIn3n+2m system revealed a superconducting transition at Tc = 0.69 K arising from Ce2PdIn8 and another, magnetic transition at Tm = 1.67 K arising from either Ce3PdIn11 or Ce5Pd2In19. Low-temperature data of Ce4Pd10In21 display ferromagnetic long-range order below 0.8 K.

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Heavy-fermion superconductivity in

Cited by 41 publications

References 17 publications

Kaczorowskiet al.Reply:

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Anomalous superfluid density in quantum critical superconductors

Solution Growth and Investigation of the Single Crystals from the CePdIn System

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