Microwave Conductivity and Penetration Depth in the Heavy Fermion Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CeCoIn</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Ormeno, R. J.; Sibley, Andrew; Gough, C.E.; Sebastian, Suchitra E.; Fisher, I. R.

doi:10.1103/physrevlett.88.047005

Cited by 83 publications

(77 citation statements)

References 18 publications

(24 reference statements)

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“…We see that the frequency dependence of 1/d 2 is indeed very strong and note the difficulty of isolating 1=l 2 L ðTÞ from a measurement at any single microwave frequency. 1=l 2 L ðTÞ has a strong temperature dependence across the whole temperature range, in contrast to an s-wave superconductor 15 , but is not strictly linear at low temperatures, as reported in previous studies [17][18][19] . This can be seen clearly in Fig.…”

Section: Resultsmentioning

confidence: 72%

“…In the cuprates, where similarly strong scattering is observed in the normal state 27 , electrodynamic measurements show a rapid collapse in quasiparticle scattering on cooling through T c [28][29][30] , indicating that the charge carriers couple to a spectrum of fluctuations of electronic origin, in contrast to the phonons of a conventional metal. Early measurements on CeCoIn 5 are suggestive of similar behaviour 2,17 .…”

mentioning

confidence: 86%

“…However, penetration-depth data on CeCoIn 5 remain surprisingly unclear. Instead of the linear temperature dependence expected for line nodes, all penetration-depth measurements to date [17][18][19] report temperature power laws ranging from T 1.2 to T 1. 5 .…”

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confidence: 99%

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Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn5 revealed by precision microwave spectroscopy

et al. 2013

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CeCoIn 5 is a heavy fermion superconductor with strong similarities to the high-T c cuprates, including quasi-two-dimensionality, proximity to antiferromagnetism and probable d-wave pairing arising from a non-Fermi-liquid normal state. Experiments allowing detailed comparisons of their electronic properties are of particular interest, but in most cases are difficult to realize, due to their very different transition temperatures. Here we use low-temperature microwave spectroscopy to study the charge dynamics of the CeCoIn 5 superconducting state. The similarities to cuprates, in particular to ultra-clean YBa 2 Cu 3 O y , are striking: the frequency and temperature dependence of the quasiparticle conductivity are instantly recognizable, a consequence of rapid suppression of quasiparticle scattering below T c ; and penetration-depth data, when properly treated, reveal a clean, linear temperature dependence of the quasiparticle contribution to superfluid density. The measurements also expose key differences, including prominent multiband effects and a temperature-dependent renormalization of the quasiparticle mass.

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Section: Resultsmentioning

confidence: 72%

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confidence: 86%

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Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn5 revealed by precision microwave spectroscopy

et al. 2013

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“…The competition between increasing τ and decreasing quasiparticle density n n (T ) = n − n s (T ) makes a peak in σ 1 (T ). This behavior is ubiquitous among superconductors having strong inelastic scattering in the normal state [27,44,74]. Following the pioneering work by Bonn et al [45], we employ the two-fluid analysis to extract the quasiparticle scattering rate 1/τ (T ) at low temperatures below ∼ 25 K. In Fig.…”

Section: Quasiparticle Conductivitymentioning

confidence: 99%

Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors

Shibauchi

Hashimoto

Okazaki

et al. 2009

Physica C: Superconductivity

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In this article, we review our recent studies of microwave penetration depth, lower critical fields, and quasiparticle conductivity in the superconducting state of Fe-arsenide superconductors. Highsensitivity microwave surface impedance measurements of the in-plane penetration depth λ ab in single crystals of electron-doped PrFeAsO1−y (y ∼ 0.1) and hole-doped Ba1−xKxFe2As2 (x ≈ 0.55) are presented. In clean crystals of Ba1−xKxFe2As2, as well as in PrFeAsO1−y crystals, the penetration depth shows flat temperature dependence at low temperatures, indicating that the superconducting gap opens all over the Fermi surface. The temperature dependence of superfluid density λ 2 ab (0)/λ 2 ab (T ) in both systems is most consistent with the existence of two different gaps. In Ba1−xKxFe2As2, we find that the superfluid density is sensitive to degrees of disorder inherent in the crystals, implying unconventional impurity effect. We also determine the lower critical field Hc1 in PrFeAsO1−y by using an array of micro-Hall probes. The temperature dependence of Hc1 saturates at low temperatures, fully consistent with the superfluid density determined by microwave measurements. The anisotropy of Hc1 has a weak temperature dependence with smaller values than the anisotropy of upper critical fields at low temperatures, which further supports the multi-gap superconductivity in Fe-arsenide systems. The quasiparticle conductivity shows an enhancement in the superconducting state, which suggests the reduction of quasiparticle scattering rate due to the gap formation below Tc. From these results, we discuss the structure of the superconducting gap in these Fe-arsenides, in comparison with the high-Tc cuprate superconductors.

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“…In particular, CeCoIn 5 continues to generate great interest, as it exhibits strong Pauli paramagnetic effects [139] that, combined with its quasi-2D structure and super-clean crystal properties [140,141], fulfill the stringent requirements for the stabilization of the inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state [142,143]. However, up to now, unambiguous microscopic proof for the existence of the FFLO state does not exist, in spite of the multitude of experimental signatures that were reported that suggest the formation of a FFLO phase [144][145][146][147][148].…”

Section: Cein 3 and Cemin (M = Co Ir Rh)mentioning

confidence: 99%

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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Standard models for simple metals and insulators often fail for systems based on elements with unstable d-or f -electron shells, where strong electronic correlations can generate new and unexpected states of matter. Such a scenario can often be induced when a magnetic phase transition is tuned to absolute zero temperature by an external control parameter such as chemical composition, pressure or magnetic field. At the resulting quantum critical point (QCP), emergent phenomena, such as unconventional superconductivity and novel magnetic phases are frequently observed. The temperature and energy dependences of the physical properties are also found to deviate from expectations for a simple Fermi liquid. This "non-Fermi-liquid" (NFL) behavior is commonly manifested as weak power laws and logarithmic divergences in the physical properties at low temperatures and is often found in a V-shaped region near a QCP, which has become the "classic" QCP phase diagram. However, there is also a growing number of materials where the NFL behavior either occurs far away from the QCP, within an ordered phase, or may not be associated with any putative QCP. Thus, after nearly 20 years of research, it remains unknown whether NFL physics is universal, or if a multitude of unique subclasses exist. In this article, we review research that has primarily been carried out in our laboratory on systems that exhibit NFL behavior that does not conform to the "classic" QCP scenario.

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Microwave Conductivity and Penetration Depth in the Heavy Fermion SuperconductorCeCoIn5

Cited by 83 publications

References 18 publications

Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn5 revealed by precision microwave spectroscopy

Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn5 revealed by precision microwave spectroscopy

Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

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