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Ishida, K.; Kawasaki, Yu; Tabuchi, K.; Kashima, K.; Kitaoka, Y.; Asayama, Kunisuke; Geibel, C.; Steglich, F.

doi:10.1103/physrevlett.82.5353

Cited by 109 publications

(109 citation statements)

References 22 publications

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“…Finally, we compare the present results with those on Ce 0.975 Cu 2 Si 2 (Ce0.975) where an AFM order was reported below T N ∼ 0.6 K [9,43]. Unlike the Ge substituted samples, however, any signature of superconductivity was not observed up to P = 2 GPa in Ce0.975, and the AFM order persists [44].…”

Section: The Af and Sc Phase Diagram In Cecu2si2mentioning

confidence: 69%

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Coexistence of antiferromagnetism and superconductivity in heavy-fermion systems

Kitaoka

Kawasaki

Mito

et al. 2002

Journal of Physics and Chemistry of Solids

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We report the novel pressure(P )−temperature(T ) phase diagrams of antiferromagnetism (AF) and superconductivity (SC) in CeRhIn5, CeIn3 and CeCu2Si2 revealed by the NQR measurement. In the itinerant helical magnet CeRhIn5, we found that the Néel temperature TN is reduced at P ≥ 1.23 GPa with an emergent pseudogap behavior. The coexistence of AF and SC is found in a narrow P range of 1.63 − 1.75 GPa, followed by the onset of SC with line-node gap over a wide P window 2.1 − 5 GPa. In CeIn3, the localized magnetic character is robust against the application of pressure up to P ∼ 1.9 GPa, beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations. In CeCu2Si2, the SC and AF coexist on a microscopic level once its lattice parameter is expanded. We remark that the underlying marginal antiferromagnetic state is due to collective magnetic excitations in the superconducting state in CeCu2Si2. An interplay between AF and SC is discussed on the SO(5) scenario that unifies AF and SC. We suggest that the SC and AF in CeCu2Si2 have a common mechanism.

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Section: The Af and Sc Phase Diagram In Cecu2si2mentioning

confidence: 69%

“…From the Cu-NQR measurements [9], we showed that the A-phase at H = 0 behaves as a marginal AFM state, where slowly fluctuating AFM waves propagate over a long distance and coexist with the SC state. It is quite unusual that their characteristic frequencies range in NQR frequencies of 3 ∼ 4 MHz.…”

Section: Introductionmentioning

confidence: 99%

Coexistence of antiferromagnetism and superconductivity in heavy-fermion systems

Kitaoka

Kawasaki

Mito

et al. 2002

Journal of Physics and Chemistry of Solids

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“…Instead, if we assume µ ef f = 1µ B and R Tc = 1 in U-based systems, we obtain K i (α) ≈ 4 that is comparable to that in Ce-based HFS's in which antiferromagnetic spin fluctuations are dominant and systems are close to a magnetic quantum critical point. 62,63 This is, however, unlikely to occur in U-based HFS's becasue 1/T 1 T = const. behavior strongly suggests that antiferromagnetic spin fluctuations are not dominant at low T 's.…”

Section: Anisotropic Quasi-particle Korringa Relationmentioning

confidence: 99%

Quasparticle Spin Susceptibility in Heavy-Fermion Superconductors: An NMR Study Compared with Specific Heat Results

2005

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Quasi-particle spin susceptibility (χ qp ) for various heavy-fermion (HF) superconductors are discussed on the basis of the experimental results of NMR Knight shift (K), NMR relaxation rate (1/T1), and electronic specific heat (γ el ) within the framework of the Fermi liquid model for a Kramers doublet crystal electric field (CEF) ground state. χγ is calculated from the enhanced Sommerfeld coefficient γ el , and χT 1 from the quasi-particle Korringa relation T1T (KT 1 ) 2 = const. via the relation of χT 1 = (NAµB/A hf )KT 1 where A hf is the hyperfine coupling constant, NA the Abogadoro's number and µB the Bohr magneton. For the even-parity (spin-singlet) superconductors CeCu2Si2, CeCoIn5 and UPd2Al3, the fractional decrease in the Knight shift, δK obs = K obs (Tc) − K obs (T → 0), below the superconducting transition temperature (Tc) is due to the decrease of the spin susceptibility of heavy quasi-particle estimated consistently from χγ and χT 1 . This result allows us to conclude that the heavy quasi-particles form the spin-singlet Cooper pairs in CeCu2Si2, CeCoIn5 and UPd2Al3. On the other hand, no reduction in the Knight shift is observed in UPt3 and UNi2Al3, nevertheless the estimated values of χγ and χT 1 are large enough to be probed experimentally. The odd-parity superconductivity is therefore concluded in these compounds. The NMR Knight shift result provides a convincing way to classify the HF superconductors into either even-or odd-parity pairing.

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“…Despite intense research, the precise form of the superconducting order parameter remains elusive. Measurements of the relaxation rate of the nuclear quadrupolar resonance [7,8] and specific heat under pressure [9] have yielded evidence for an unconventional order parameter. Angle-resolved resistivity measurements of the upper critical field H c2 exhibit a fourfold symmetry of H c2 consistent with a d xy symmetry of the order parameter [10].…”

Section: Introductionmentioning

confidence: 99%

Superconducting gap and vortex lattice of the heavy-fermion compoundCeCu2Si2

et al. 2016

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The order parameter and pairing mechanism for superconductivity in heavy-fermion compounds are still poorly understood. Scanning tunneling microscopy and spectroscopy at ultralow temperatures can yield important information about the superconducting order parameter and the gap structure. Here, we study the first heavyfermion superconductor, CeCu 2 Si 2 . Our data show the superconducting gap which is not fully formed and exhibits features that point to a multigap order parameter. Spatial mapping of the zero-bias conductance in magnetic field reveals the vortex lattice, which allows us to unequivocally link the observed conductance gap to superconductivity in CeCu 2 Si 2 . The vortex lattice is found to be predominantly triangular with distortions at fields close to ∼ 0.7H c2 .

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Evolution from Magnetism to Unconventional Superconductivity in a Series ofCexCu2Si2

Cited by 109 publications

References 22 publications

Coexistence of antiferromagnetism and superconductivity in heavy-fermion systems

Coexistence of antiferromagnetism and superconductivity in heavy-fermion systems

Quasparticle Spin Susceptibility in Heavy-Fermion Superconductors: An NMR Study Compared with Specific Heat Results

Superconducting gap and vortex lattice of the heavy-fermion compoundCeCu2Si2

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