London penetration depth measurements of the heavy-fermion superconductor CeCoIn
                    <sub>5</sub>
                    near a magnetic quantum critical point

Özcan, S.; Broun, D. M.; Morgan, Benjamin; Haselwimmer, R. K. W.; Sarrao, J. L.; Kamal, Saeid; Bidinosti, Christopher; Turner, Patrick; Raudsepp, Mati; Waldram, J.R.

doi:10.1209/epl/i2003-00411-9

Cited by 48 publications

(67 citation statements)

References 35 publications

(41 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: Resultssupporting

confidence: 65%

“…4a we see that instead of becoming temperature independent, as expected for a conventional metal, the temperature slope of om 0 s 2 (o,T ) changes sign at high frequencies, a clear indication that 1=l 2 d has temperature dependence in CeCoIn 5 . The observed behaviour corresponds to an effective mass that increases on cooling, which was raised as a possibility in earlier work 19 . This is probably a consequence of the proximity of CeCoIn 5 to quantum criticality 25 .…”

Section: Resultsmentioning

confidence: 55%

“…58). At the lowest frequency, 0.13 GHz, surface reactance was measured using a tunnel-diode oscillator and was previously published by Ö zcan et al 19 At all other frequencies, surface impedance was measured using dielectric-resonator techniques, in a dilution-refrigeratorbased variant of the apparatus described in the study by Huttema et al 36 The absolute surface resistance was obtained at each frequency using an in situ bolometric technique, by detecting the synchronous rise in temperature when the sample was subjected to a microwave field of known, time-varying intensity 59 . Thermal expansion effects make a small contribution to the apparent surface reactance, DX th s % À ðom 0 c=2ÞbðTÞ, where c is the thickness of the sample and b(T) is the volume coefficient of thermal expansion.…”

Section: Methodsmentioning

confidence: 99%

“…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: 95%

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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: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 55%

Section: Methodsmentioning

confidence: 99%

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

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“…[159] We should also mention that CeCoIn 5 is the first superconductor where solid evidence exists for the famous high field, inhomogeneous Fulde-FerrellLarkin-Ovchinikov (FFLO) state. [121,70,23] Tunnel diode oscillator penetration depth measurements have also shown evidence for a transition to this state.…”

Section: Magnetic Impuritiesmentioning

confidence: 99%

Magnetic penetration depth in unconventional superconductors

Prozorov

Giannetta

2006

Supercond. Sci. Technol.

417

438

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Abstract. This topical review summarizes various features of magnetic penetration depth in unconventional superconductors. Precise measurements of the penetration depth as a function of temperature, magnetic field and crystal orientation can provide detailed information about the pairing state. Examples are given of unconventional pairing in hole-and electron-doped cuprates, organic and heavy fermion superconductors. The ability to apply an external magnetic field adds a new dimension to penetration depth measurements. We discuss how field dependent measurements can be used to study surface Andreev bound states, nonlinear Meissner effects, magnetic impurities, magnetic ordering, proximity effects and vortex motion. We also discuss how penetration depth measurements as a function of orientation can be used to explore superconductors with more than one gap and with anisotropic gaps. Details relevant to the analysis of penetration depth data in anisotropic samples are also discussed.Keywords: penetration depth, unconventional superconductivity, pairing symmetry IntroductionThe early suggestion that high temperature superconductors might exhibit unconventional, d-wave pairing, [24,11,154,8] has lead to a wide variety of new experimental probes with sensitivity sufficient to test this hypothesis. The pioneering work of Hardy and coworkers demonstrated that high resolution measurements of the London penetration depth could detect the presence of nodal quasiparticles characteristic of a d-wave pairing state [87]. Since that time, a large number of new superconductors have been discovered, many of which exhibit nontrivial departures from BCS behavior. As we show in this review, penetration depth measurements can be used to examine not only nodal quasiparticles but two-gap superconductivity, anisotropy of the energy gap, Andreev surface states, nonlinear Meissner effect, interplane transport, proximity coupled diamagnetism, vortex matter and the coexistence of magnetism and superconductivity, to name several problems of current interest.

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Superfluid response in heavy fermion superconductors

Zhong

Zhang

Shao³

et al. 2016

Front. Phys.

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Motivated by recent London penetration depth measurement [H. Kim et al. Phys. Rev. Lett. \textbf{114}, 027003 (2015)] and novel composite pairing scenario [O. Erten, R. Flint and P. Coleman, Phys. Rev. Lett. \textbf{114}, 027002 (2015)] on Yb-doped heavy fermion superconductor CeCoIn$_{5}$, we revisit the issue of superfluid response in microscopic heavy fermion lattice model. However, it is found that in literature explicit expression of superfluid response function in heavy fermion superconductor is rare. In this paper, we make a contribution to this issue by investigating superfluid density response function in celebrated Kondo-Heisenberg model. To be specific, we derive corresponding formalism from an effective fermionic large-N mean-field pairing Hamiltonian, whose pairing interaction is assumed to originate from effective local antiferromagnetic exchange interaction. Interestingly, it is found that physically correct superfluid density formula can only be obtained if external electromagnetic field is directly coupled to heavy fermion quasi-particle. Such unique feature emphasizes the key role of Kondo-screening-renormalized quasi-particle for low-temperature/energy thermodynamics and transport behaviors. As an important application, the theoretical result is compared to experimental measurement in heavy fermion superconductor CeCoIn$_{5}$ and Yb-doped Ce$_{1-x}$Yb$_{x}$CoIn$_{5}$, where the agreement is fairly good and the transition of pairing symmetry in the latter one is explained as a simple doping effect. In addition, the requisite formalism for the commonly encountered nonmagnetic impurity and non-local electrodynamic effect are developed.Comment: 14 pages, 11 figures, references updated and discussion expande

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London penetration depth measurements of the heavy-fermion superconductor CeCoIn ₅ near a magnetic quantum critical point

Cited by 48 publications

References 35 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

Magnetic penetration depth in unconventional superconductors

Superfluid response in heavy fermion superconductors

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London penetration depth measurements of the heavy-fermion superconductor CeCoIn 5 near a magnetic quantum critical point

Cited by 48 publications

References 35 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

Magnetic penetration depth in unconventional superconductors

Superfluid response in heavy fermion superconductors

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Product

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London penetration depth measurements of the heavy-fermion superconductor CeCoIn ₅ near a magnetic quantum critical point