Inhomogeneity-Induced Enhancement of the Pairing Interaction in Cuprate Superconductors

Maśka, Maciej M.; Śledź, Ż.; Czajka, Katarzyna; Mierzejewski, Marcin

doi:10.1103/physrevlett.99.147006

Cited by 57 publications

(53 citation statements)

References 22 publications

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“…Moreover, electronic correlations may lead to a highly non-trivial interplay between magnetism and the FFLO superconductivity [15]. In disordered systems one may also expect that the pairing interaction becomes a site--dependent quantity [16]. An additional limitation of the present approach originates from the assumption that the magnetic field is parallel to the superconducting plane.…”

Section: Modelmentioning

confidence: 91%

The Fulde-Ferrell-Larkin-Ovchinnikov Superconductivity in Disordered Systems

Ptok

2010

Acta Phys. Pol. A

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The Fulde-Ferrell-Larkin-Ovchinnikov phase, with a spatially oscillating order parameter, may be induced by strongly magnetic field at low temperature. It is believed that the Fulde-Ferrell-Larkin-Ovchinnikov phase can exist only in homogeneous superconductors, and even weak impurity potential can lead to its destruction. The analysis of the Fulde-Ferrell-Larkin-Ovchinnikov phase in the Bogoliubov-de Gennes equation shows however, that this phase can exist in the presence of weak disorder. Using Bogoliubov-de Gennes equations, we discussed the influence of diagonal and off-diagonal disorder on the Fulde-Ferrell-Larkin-Ovchinnikov phase.

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Section: Modelmentioning

confidence: 91%

The Fulde-Ferrell-Larkin-Ovchinnikov Superconductivity in Disordered Systems

Ptok

2010

Acta Phys. Pol. A

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“…Similar numerical studies for the one component t-J models have been investigated by a number of groups considering the * corresponding author; e-mail: jkrzyszczak@kft.umcs.lublin.pl s-wave [11] and d-wave symmetries [12][13][14][15][16]. In the two--component scenario we shall extend their and our previous analysis [17] exploring the several possible kinds of inhomogeneities affecting the system.…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneities in Superconductors Described by the Two-Component Model

2010

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We study fluctuations of the superconducting order parameter of s-wave symmetry caused by nonmagnetic disorder present both in the boson and fermion subsystems using the Bogoliubov-de Gennes equations. In particular, we are interested if some features of the d-wave model persist for s-wave symmetry as well. These are: positive correlations between positions of impurities and the magnitude of energy gap, the homogeneity of the local density of states at low energies, nanoscale inhomogeneity of the coherence peak positions and their non-uniform height. We have found that spatial variations of s-wave order parameter are positively correlated with the positions of impurities. Such behavior has been observed in scanning tunneling measurements on d-wave symmetry BSCCO-2122 superconductors.

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“…[22,23,24,25,26,27]). But first, we make the following curious observation: In a high-T c superconductor the major source of disorder is presumably the dopant atoms.…”

Section: Metallic [If ǫ < (T − T P )/T ] Puddlementioning

confidence: 99%

Mesoscopic gap fluctuations in an unconventional superconductor

Galitski

2008

Phys. Rev. B

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We study mesoscopic disorder fluctuations in an anisotropic gap superconductor, which lead to the spatial variations of the local pairing temperature and formation of superconducting islands above the mean-field transition. We derive the probability distribution function of the pairing temperatures and superconducting gaps. It is shown that above the mean-field transition, a disordered BCS superconductor with an unusual pairing symmetry is described by a network of superconducting islands and metallic regions with a strongly suppressed density of states due to superconducting fluctuations. We argue that the phenomena associated with mesoscopic disorder fluctuations may also be relevant to the high-temperature superconductors, in particular, to recent STM experiments, where gap inhomogeneities have been explicitly observed. It is suggested that the gap fluctuations in the pseudogap phase should be directly related to the corresponding fluctuations of the pairing temperature. PACS numbers: 74.40.+k, 74.81.Bd, 74.20.De Understanding the phase diagram and the properties of the high-temperature and other unconventional superconductors has been among the most complex problems of modern condensed matter physics. Most current theoretical approaches to the problem concentrate on strong correlation physics and usually assume that the effects of disorder are unimportant. However, there exist a number of recent experimental works, in particular STM studies of the high-T c cuprates, 1,2,3,4,5,6,7 which provide a tentative indication that at least in some materials disorder plays an important role in the local formation of the superconducting gap. In particular, Gomes et al. 2 have studied the local development of the gap as a function of temperature in Bi 2 Sr 2 CaCu 2 O 8+δ above the superconducting transition and up to a pseudogap temperature, where the gap inhomogeneities cease to exist. An important result of this experiment is that the real-space gap map observed was static and reproducible. This strongly suggests that the inhomogeneous gap formation is unlikely to be a phase-separation or superconducting fluctuation effect, but is due to some kind of disorder in the system.Motivated by these experiments, we theoretically consider a disordered superconductor with an unusual pairing symmetry (e.g., a d-wave superconductor) and study mesoscopic variations of the local pairing temperature. We point out that the existence of the Griffiths-type 8,9,10 phase in the superconducting phase diagram is specific to an anisotropic gap superconductor and should not occur in the conventional swave systems (due to Anderson theorem), unless they are extremely dirty or time-reversal symmetry is broken. 11,12,13 An important observation is that if the pairing gap is anisotropic, the Anderson theorem breaks down and the superconducting pairing temperature, T p , is suppressed by disorder even if time-reversal symmetry is preserved (here and below we make a distinction between the pairing temperature, T p , and the superconducting trans...

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Inhomogeneity-Induced Enhancement of the Pairing Interaction in Cuprate Superconductors

Cited by 57 publications

References 22 publications

The Fulde-Ferrell-Larkin-Ovchinnikov Superconductivity in Disordered Systems

The Fulde-Ferrell-Larkin-Ovchinnikov Superconductivity in Disordered Systems

Inhomogeneities in Superconductors Described by the Two-Component Model

Mesoscopic gap fluctuations in an unconventional superconductor

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