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Fisher, Robert A.; Bouquet, F.; Phillips, N. E.; Hundley, M. F.; Pagliuso, P. G.; Sarrao, J. L.; Fisk, Z.; Thompson, J. D.

doi:10.1023/a:1021051004086

Cited by 15 publications

(17 citation statements)

References 7 publications

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“…Assuming that magnetic fluctuations stabilize the superconducting phase and become stronger at the QCP, P * 3 should be regarded as a virtual QCP. In the vicinity of the QCP some pressure-induced HF superconductors display a strong enhancement of the effective mass of the conduction electrons; namely, via the γ n value and the coefficient A of the T 2 term of the electrical resistivity [79,80,81]. In the cases of CeRhSi 3 and CeIrSi 3 , however, such an enhancement is less obvious.…”

Section: Quantum Criticality and Non-fermi Liquidmentioning

confidence: 99%

Non-centrosymmetric Heavy-Fermion Superconductors

Kimura

Bonalde

2012

Non-Centrosymmetric Superconductors

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In this chapter we discuss the physical properties of a particular family of non-centrosymmetric superconductors belonging to the class heavy-fermion compounds. This group includes the ferromagnet UIr and the antiferromagnets CeRhSi 3 , CeIrSi 3 , CeCoGe 3 , CeIrGe 3 and CePt 3 Si, of which all but CePt 3 Si become superconducting only under pressure. Each of these superconductors has intriguing and interesting properties. We first analyze CePt 3 Si, then review CeRhSi 3 , CeIrSi 3 , CeCoGe 3 and CeIrGe 3 , which are very similar to each other in their magnetic and electrical properties, and finally discuss UIr. For each material we discuss the crystal structure, magnetic order, occurrence of superconductivity, phase diagram, characteristic parameters, superconducting properties and pairing states. We present an overview of the similarities and differences between all these six compounds at the end. CePt 3 SiThe enormous interest in superconductors without inversion symmetry started with the discovery of superconductivity in the heavy-fermion compound CePt 3 Si [1], which exhibits long-range antiferromagnetic (AFM) order below the Neel temperature T N = 2.2 K and becomes superconducting at the critical temperature T c = 0.75 K. CePt 3 Si is the only known heavy-fermion (HF) compound without inversion symmetry that superconducts at ambient pressure, as opposed to the cases of CeIrSi 3 , CeRhSi 3 , CeCoGe 3 , CeIrGe 3 and UIr. The heavy-fermion character has

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Section: Quantum Criticality and Non-fermi Liquidmentioning

confidence: 99%

Non-centrosymmetric Heavy-Fermion Superconductors

Kimura

Bonalde

2012

Non-Centrosymmetric Superconductors

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“…The Ce magnetic moments, antiferromagnetically ordered, lie completely in the basal plane developing a helicoidal structure along the c-axis with a propagation vector q = (1/2,1/2,0.297) that is incommensurate with the atomic lattice. 6,7 The absence of any magnetic order in CeIrIn 5 and CeCoIn 5 suggests that Rh plays a crucial role in establishing the magnetic structure. In fact, muon spin rotation experiments 8 suggest a small ordered magnetic moment at the Rh sites that might be responsible for the weak coupling of the Ce moments along the c-axis (via a superexchange mechanism) while the usual RKKY interaction accounts for the antiferromagnetic order within the basal plane.…”

Section: Introductionmentioning

confidence: 99%

High-magnetic-field thermal expansion and elastic properties ofCeRhIn5

et al. 2005

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We report high magnetic field thermal-expansion and magnetostriction results on CeRhIn5 single crystals. Several transitions, both first and second order, are observed when the field is applied perpendicular to the crystallographic c-axis. The magnetic field dependence of the thermal-expansion coefficient above 15 K, where the magnetic correlations are negligible, can be explained supposing an almost pure | ± 5/2 ground state doublet, in apparent contradiction with neutron scattering experiments. Although the spin-lattice interaction is relevant in this compound, the effect of the magnetic correlations on the elastic properties is relatively weak, as revealed by resonant ultrasound spectroscopy experiments.

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“…In CeMIn 5 (M = Ir, Co, and Rh), the unconventional superconductivity with line-node gap is suggested from the power-law temperature (T ) dependence of specific heat [2,3,5], nuclear relaxation rate 1/T 1 [6,7,8,9], penetration depth [10,11,12], thermal conductivity [13], and so on. Systematic investigation of this new family of HF superconductors allows us to unravel a relationship between the occurrence of unconventional superconductivity and possible spin fluctuations in the normal state.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor CeCoIn₅: In-NQR and Co-NMR Studies

Kawasaki

Yashima

et al. 2003

J. Phys. Soc. Jpn.

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We report In-NQR and Co-NMR experiments of CeCoIn5 that undergoes a superconducting transition with a record high Tc = 2.3 K to date among heavy-fermion superconductors. At zero magnetic field, an anomalous temperature (T ) dependence of nuclear spin-lattice relaxation rate 1/T1 of 115 In is explained by the relation 1/T1 ∝ T · χQ(T ) 3/4 based on the anisotropic spinfluctuations model in case of the proximity to an antiferromagnetic (AFM) quantum critical point (QCP). The novel behavior of 1/T1 ∼ T 1/4 over a wide T range of Tc < T < 40 K arises because the staggered susceptibility almost follows the Curie law χQ(T ) ∝ 1/(T + θ) with θ = 0.6 K and hence 1/T1 ∝ T /(T + 0.6) 3/4 ∼ T 1/4 for θ < T . We highlight that the behavior 1/T1 ∼ T 1/4 is due to the proximity to the anisotropic AFM QCP relevant with its layered structure, and is not associated with the AFM QCP for isotropic 3D systems. We have also found that the AFM spin fluctuations in CeCoIn5 are suppressed by small magnetic field so that θ = 0.6 K at H=0 increases to θ = 2.5 K at H = 1.1 T, reinforcing that CeCoIn5 is closely located at the QCP.

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Untitled

Cited by 15 publications

References 7 publications

Non-centrosymmetric Heavy-Fermion Superconductors

Non-centrosymmetric Heavy-Fermion Superconductors

High-magnetic-field thermal expansion and elastic properties ofCeRhIn5

Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor CeCoIn₅: In-NQR and Co-NMR Studies

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Untitled

Cited by 15 publications

References 7 publications

Non-centrosymmetric Heavy-Fermion Superconductors

Non-centrosymmetric Heavy-Fermion Superconductors

High-magnetic-field thermal expansion and elastic properties ofCeRhIn5

Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor CeCoIn5: In-NQR and Co-NMR Studies

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Product

Resources

About

Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor CeCoIn₅: In-NQR and Co-NMR Studies