Superconductivity in non-centrosymmetric materials

Sigrist, Manfred; Agterberg, D. F.; Frigeri, P.A.; Hayashi, Nobuhiko; Kaur, Raminder; Koga, Akihisa; Milat, I.; Wakabayashi, Katsunori; Yanase, Youichi

doi:10.1016/j.jmmm.2006.10.141

Cited by 71 publications

(74 citation statements)

References 30 publications

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“…CaIrSi 3 belongs to space group I4mm with the point group C 4v , resulting in 5 irreducible representations that can be used to construct permissible superconducting pairing states 33 . The ZFand TF-µSR measurements are sensitive to details of the superconducting gap function, including the presence of gap nodes and respect for time-reversal symmetry, and can therefore help determine which pairing state is realized in CaIrSi 3 .…”

Section: Discussionmentioning

confidence: 99%

Superconducting properties of noncentrosymmetric superconductorCaIrSi3investigated by muon spin relaxation and rotation

et al. 2015

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We have employed muon spin relaxation and rotation (µSR) to investigate the superconducting properties of the noncentrosymmetric superconductor CaIrSi 3 . Measurements of single-crystal specimens confirm the development of a robust superconducting state below T c = 3.55 ± 0.1 K with a ground-state magnetic penetration depth of λ L = 288 ± 10 nm and a coherence length of ξ = 28.8 ± 0.1 nm. The temperature evolution of the superfluid density indicates a nodeless superconducting gap structure dominated by an isotropic spin-singlet component in the dirty limit, with a carrier density of n = (4.6 ± 0.2) × 10 22 cm −3 as determined by Hall resistance measurements. We find no evidence of spontaneous time-reversal symmetry breaking in the superconducting state within an accuracy of 0.05 G. These observations suggest that the influence of any spin-triplet pairing component or multiple gap structure associated with noncentrosymmetric physics is very weak or entirely absent in CaIrSi 3 .

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Section: Discussionmentioning

confidence: 99%

Superconducting properties of noncentrosymmetric superconductorCaIrSi3investigated by muon spin relaxation and rotation

et al. 2015

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“…In recent years, experimental and theoretical studies of the non-centrosymmetric superconductors (NCS) have attracted much attention due to their complex superconducting properties [1,2]. Following the first report of the observation of superconductivity in the non-centrosymmetric heavy fermion compound CePt 3 Si [3], there has been a lot of interest in NCS.…”

Section: Introductionmentioning

confidence: 99%

Crystal growth and properties of the non-centrosymmetric superconductor, Ru7B3

Singh

Parzyk

Lees

et al. 2014

Journal of Crystal Growth

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We describe the crystal growth of high quality single crystals of the non-centrosymmetric superconductor, Ru 7 B 3 by the floating zone technique, using an optical furnace equipped with xenon arc lamps. The crystals obtained are large and suitable for detailed measurements, and have been examined using x-ray Laue patterns. The superconducting properties of the crystals obtained have been investigated by magnetisation and resistivity measurements. Crystals have also been grown starting with enriched 11 B isotope, making them suitable for neutron scattering experiments.

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“…Superconducting pairing on a given helicity sheet is comprised of a mixture of spin singlet and triplet eigenstates, and may exhibit unusual magnetic properties and/or display nodes in the energy gap, depending on the structure and the strength of the triplet component. [2][3][4][5][6] In contrast to the triplet p-wave superconductors proposed in centrosymmetric systems, such as Sr 2 RuO 4 , the lack of inversion symmetry makes it possible for the triplet component to exist in a fully spatially-symmetric paired state, so that one can speak, for example, of a triplet s-wave superconductor. 3 Similarly, nodes in the superconducting gap may exist even when the pair wave function exhibits the full spatial symmetry of the crystal.…”

Section: Introductionmentioning

confidence: 99%

Physical properties of the noncentrosymmetric superconductor Nb0.18Re0.82

et al. 2011

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PACS number(s): 74.70.AdWe report the synthesis and measurements of magnetic, transport, and thermal properties of polycrystalline Nb 0.18 Re 0.82 , which has a superconducting transition at T c ~ 8.8 K. The noncentrosymmetric α-Mn structure of the compound is confirmed by X-ray diffraction. Using the measured values for the lower critical field H c1 , upper critical field H c2 , and the specific heat C, we estimate the thermodynamic critical field H c (0), coherence length ξ(0), penetration depth λ(0), and the Ginzburg-Landau parameter κ(0). The specific heat jump at T c , ΔC/γT c = 1.86, suggests that Nb 0.18 Re 0.82 is a moderately coupled superconductor. Below T c the electronic specific heat decays exponentially, suggesting that the gap is isotropic. Our data suggest that the triplet admixture is weak in the polycrystalline form of compound. However, the estimated value of the upper critical field H c2 (0) is close to the calculated Pauli limit.

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Superconductivity in non-centrosymmetric materials

Cited by 71 publications

References 30 publications

Superconducting properties of noncentrosymmetric superconductorCaIrSi3investigated by muon spin relaxation and rotation

Superconducting properties of noncentrosymmetric superconductorCaIrSi3investigated by muon spin relaxation and rotation

Crystal growth and properties of the non-centrosymmetric superconductor, Ru7B3

Physical properties of the noncentrosymmetric superconductor Nb0.18Re0.82

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