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Maśka, Maciej M.; Mierzejewski, Marcin; Andrzejewski, B.; Foo, M. L.; Cava, R. J.; Klimczuk, Tomasz

doi:10.1103/physrevb.70.144516

Cited by 31 publications

(42 citation statements)

References 31 publications

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“…It would be interesting to see if there exists a type-II superconductor for which B C < B C2 . There are claims [7] that this happens in Na x CoO 2 superconductor.…”

Section: Effect Of the Coulomb Repulsion On The Pair Bindingmentioning

confidence: 99%

Cooper Pair in Two Nonstandard Situations

et al. 2006

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We summarize briefly our recent work on the bound states of two electrons (Cooper pairs) in two nonstandard situations: when the quasiparticle masses depend on spin and when an electron pair is localized on a two--dimensional quantum dot and placed in an applied magnetic field. In both cases we are dealing with an extension of the original Cooper approach. The applicability of the results is briefly mentioned.

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“…It would be interesting to see if there exists a type-II superconductor for which B C < B C2 . There are claims [7] that this happens in Na x CoO 2 superconductor.…”

Section: Effect Of the Coulomb Repulsion On The Pair Bindingmentioning

confidence: 99%

Cooper Pair in Two Nonstandard Situations

et al. 2006

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“…For the details see Ref. [17]. discrepancy can be explained in terms of field induced phase transition between various superconducting order parameters.…”

Section: Numerical Resultsmentioning

confidence: 99%

Upper Critical Field for Cobalt Oxide Superconductors

Maśka¹,

Mierzejewski²

2005

New Challenges in Superconductivity: Experimental Advances and Emerging Theories

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Motivated by the recent discovery of the cobalt oxide superconductors, we calculate the temperature dependence of the upper critical field on a triangular lattice. Using the lattice version of the Gor'kov equations we investigate how the applied magnetic field affects singlet and triplet types of superconductivity. We show that in a wide range of model parameters not only Zeeman coupling, but also the diamagnetic pair breaking mechanism favors the triplet pairing. In the cobalt oxide superconductors the symmetry of the order parameter remains an open problem and both singlet and triplet superconductivity should be taken into account. We show that in such a case, an external magnetic field may induce a transition from singlet to triplet superconductivity. We discuss experimental results which may confirm this tempting hypothesis.

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“…Equation (2) gives the chemical potential µ(T ) as a function of the temperature and the conduction band filling 0 < n < 1 fixed for the normal metallic phase at T = 0. The chemical potential µ(T = 0), which allows us to control the carrier concentration n, in the case of half-filling is equal to zero [7,8,[10][11][12][13]. Since the conventional phonon-mediated pairing mechanism raises doubts, we assume a generic, boson--mediated, strongly anisotropic attraction mechanism providing pairing interaction in the spin-antisymmetric and the spin-symmetric channels [1,3,11].…”

Section: Introductionmentioning

confidence: 99%

“…In some more composed approaches superconductivity is considered as a mixture of coexisting local pairs and itinerant fermions coupled via a charge exchange mechanism [4,5], or additional terms of energy are included, such as the formation energy of the Zhang-Rice singlet [6] or the Peierls phase factor, responsible for the diamagnetic response of the system [7]. Such approaches, which find their origin in a proposed model of the anisotropic Fermi liquid [8], allow us to reveal various types of superconducting behavior.…”

Section: Introductionmentioning

confidence: 99%

On Possibility of Realization of d- or p-Wave Symmetry States in Anisotropic Superconductors

Gonczarek

Krzyzosiak

2006

Acta Phys. Pol. A

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We consider a model of high-T c superconductors with an anisotropic boson-mediated pairing mechanism corresponding to the nearest-neighbor interactions, and the one-particle dispersion relation characterized by 2D Fermi surface nesting. Based upon the tight-binding or t−J approaches with half-filling we show that the effective pairing potential coefficients and the dispersion relation, which can be characterized by the parameter η = 2t 1 /t 0 , have a diverse and mutually competing influence on the values of transition temperatures. The spin-singlet d-wave symmetry superconducting state is realized for small values of η, whereas for sufficiently large values, the spin-triplet p-wave symmetry superconducting state should be formed. The specific heat jump and the isotope shift, as functions of the parameter η, are evaluated for the d-and p-wave symmetry.

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Possible singlet-to-triplet pairing transition inNaxCoO2·yH2O

Cited by 31 publications

References 31 publications

Cooper Pair in Two Nonstandard Situations

Cooper Pair in Two Nonstandard Situations

Upper Critical Field for Cobalt Oxide Superconductors

On Possibility of Realization of d- or p-Wave Symmetry States in Anisotropic Superconductors

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