Andreev bound states and tunneling characteristics of a noncentrosymmetric superconductor

Iniotakis, Christian; Hayashi, Nobuhiko; Sawa, Yoshitaka; Yokoyama, Takehito; May, Ulrich; Tanaka, Yukio; Sigrist, Manfred

doi:10.1103/physrevb.76.012501

Cited by 108 publications

(136 citation statements)

References 28 publications

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“…1 This is because this material does not have inversion center, which has stimulated further studies. 2,3,4,5,6,7,8,9,10,11,12,13,14,15 Because of the broken inversion symmetry, Rashba type spin-orbit coupling 16 (RSOC) is induced, and hence different parities, spinsinglet pairing and spin-triplet pairing, can be mixed in superconducting state. 17 From a lot of experimental and theoretical studies, it is believed that the most possible candidate of superconducting state in CePt 3 Si is s+p-wave pairing.…”

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confidence: 99%

Enhanced triplet superconductivity in noncentrosymmetric systems

2007

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We study pairing symmetry of noncentrosymmetric superconductors based on the extended Hubbard model on square lattice near half-filling, using the random phase approximation. We show that d + f -wave pairing is favored and the triplet f -wave state is enhanced by Rashba type spin-orbit coupling originating from the broken inversion symmetry. The enhanced triplet superconductivity stems from the increase of the effective interaction for the triplet pairing and the reduction of the spin susceptibility caused by the Rashba type spin-orbit coupling which lead to the increase of the triplet component and the destruction of the singlet one, respectively.

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confidence: 99%

Enhanced triplet superconductivity in noncentrosymmetric systems

2007

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“…It is very interesting to extend the present approach by including non-centrosymmetric superconductors. 40,41,42,43 …”

Section: Discussionmentioning

confidence: 99%

Charge transport in ferromagnetic semiconductor/s-wave superconductor junction

Mizuno

Yokoyama

Tanaka

2009

Physica C: Superconductivity

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We study tunneling conductance in ferromagnetic semiconductor/insulator/s-wave superconductor junction where Rashba spin-orbit interaction (RSOI) and exchange field are taken into account in the ferromagnetic semiconductor. We show that normalized conductance at zero voltage has a maximum as a function of RSOI for high transparent interface and finite exchange field. This is because Andreev reflection probability shows a nonmonotonic dependence on RSOI in the presence of the exchange field. On the other hand, for intermediate transparent interface, normalized conductance at zero voltage has a reentrant shape at zero or small exchange field with increasing RSOI but is monotonically increasing by RSOI at large exchange field.

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“…It has also been proposed that the noncentrosymmetric crystal structure along with strong correlation between electrons may lead to the mixing of spin singlet and spin-triplet superconductivity [9]. In addition, various physical properties for example thermal conductivity and magnetic penetration depth proposed line node in the energy gap [12][13][14][15][16]. In some theoretical studies the exotic mixed-state phases have been predicted for this type of superconductors.…”

Section: Introductionmentioning

confidence: 99%

Weak ferromagnetism in a noncentrosymmetric BiPd 4 K superconductor

Jha

Goyal

Neha

et al. 2015

Supercond. Sci. Technol.

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We report synthesis of non-centrosymmetric BiPd single crystal by self flux method. The BiPd single crystal is crystallized in monoclinic structure with the P2 1 space group. Detailed SEM (Scanning Electron Microscopy) results show that the crystals are formed in slab like morphology with homogenous distribution of Bi and Pd. The magnetic susceptibility measurement confirmed that the BiPd compound is superconducting below 4K. Further, BiPd exhibits weak ferromagnetism near the superconducting transition temperature in isothermal magnetization (MH) measurements. The temperature dependent electrical resistivity also confirmed that the BiPd single crystal is superconducting at T c =4K. Magneto transport measurements showed that the estimated H c2 (0) value is around 7.0kOe. We also obtained a sharp peak in heat capacity Cp(T) measurements at below 4K due to superconducting ordering. The normalized specific-heat jump, C/γT c , is 1.52, suggesting the BiPd to be an intermediate BCS coupled superconductor. The pressure dependent electrical resistivity shows the T c decreases with increasing applied pressure and the obtained dT c /dP is -0.62K/Gpa.

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Andreev bound states and tunneling characteristics of a noncentrosymmetric superconductor

Cited by 108 publications

References 28 publications

Enhanced triplet superconductivity in noncentrosymmetric systems

Enhanced triplet superconductivity in noncentrosymmetric systems

Charge transport in ferromagnetic semiconductor/s-wave superconductor junction

Weak ferromagnetism in a noncentrosymmetric BiPd 4 K superconductor

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