Evidence for Vortices in the Pseudogap Region of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:msub><mml:mi mathvariant="normal">r</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:msub><mml:mi mathvariant="normal">a</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=

Sandu, V.; Cimpoiasu, E.; Katuwal, T.; Shi, Li; Maple, M. B.; Almasan, C. C.

doi:10.1103/physrevlett.93.177005

Cited by 34 publications

(46 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, evidence from Nernst Effect [3] and magnetoresistance [4] measurements suggests the presence of vortices well above T c in under doped high T c compounds. Underdoped films patterned with an ordered array of pinning centers (e.g.…”

mentioning

confidence: 99%

“…Presently, a great deal of attention focuses on low superfluid density superconductors for which fluctuations strongly influence and substantially broaden their phase transitions. These include the high temperature superconductors [2], and in particular, their underdoped versions [3,4,5], and ultrathin superconducting films near the superconductor to insulator transition (SIT) [6,7,8,9,10]. For the latter, resistive transitions, R(T ), can develop widths comparable to or greater than the apparent mean field transition temperature, T c0 [11].…”

mentioning

confidence: 99%

“…σ b is limited by the motion of vortices which causes fluctuations in the phase of the cooper pair condensate. In between, a two fluid model may best describe the transport [7].Physical interpretations of the R(T ) in high sheet resistance films especially those near the SIT relies heavily on distinguishing the amplitude and phase fluctuation dominated regimes [3,4,5,6]. Most often, explicit models for σ f (T ) and σ b (T ) do not exist as a guide and qualitative arguments must prevail.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Magnetic-flux periodic response of nanoperforated ultrathin superconducting films

et al. 2006

View full text Add to dashboard Cite

We have patterned a hexagonal array of nano-scale holes into a series of ultrathin, superconducting Bi/Sb films with transition temperatures 2.65 K < Tco <5 K. These regular perforations give the films a phase-sensitive periodic response to an applied magnetic field. By measuring this response in their resistive transitions, R(T ), we are able to distinguish regimes in which fluctuations of the amplitude, both the amplitude and phase, and the phase of the superconducting order parameter dominate the transport. The portion of R(T ) dominated by amplitude fluctuations is larger in lower Tco films and thus, grows with proximity to the superconductor to insulator transition.The superconductors originally considered by BCS exhibited spectacularly sharp transitions from a finite resistance to zero resistance as a function of temperature [1]. Fluctuation effects were negligible. Presently, a great deal of attention focuses on low superfluid density superconductors for which fluctuations strongly influence and substantially broaden their phase transitions. These include the high temperature superconductors [2], and in particular, their underdoped versions [3,4,5], and ultrathin superconducting films near the superconductor to insulator transition (SIT) [6,7,8,9,10]. For the latter, resistive transitions, R(T ), can develop widths comparable to or greater than the apparent mean field transition temperature, T c0 [11].To discuss the effects of fluctuations on the R(T ) it is helpful to consider the two component superconductor order parameter ψ = |ψ 0 |e iφ . In bulk elemental superconductors, the sharp R(T ) reflect the near simultaneous appearance of a finite amplitude, |ψ 0 |, and long range coherence of the phase, φ. In low superfluid density superconductors, however, the amplitude first forms at high temperatures and phase coherence develops at lower temperatures [2,12,13,14]. High on a transition quasiparticles transiently form Cooper pairs, which enhances the quasiparticle or fermionic contribution to the conductivity, σ f . These pair or amplitude fluctuations give rise to the initial drop in R(T ) [15]. At very low values of R, a substantial Cooper pair density exists and the conductivity of these bosons, σ b , controls R(T ). σ b is limited by the motion of vortices which causes fluctuations in the phase of the cooper pair condensate. In between, a two fluid model may best describe the transport [7].Physical interpretations of the R(T ) in high sheet resistance films especially those near the SIT relies heavily on distinguishing the amplitude and phase fluctuation dominated regimes [3,4,5,6]. Most often, explicit models for σ f (T ) and σ b (T ) do not exist as a guide and qualitative arguments must prevail. In this paper we present the magnetic flux response of the R(T ) of very low superfluid density (high sheet resistance) [11,16] films patterned with a nanoscale array of holes. We use the quality of the flux response at different points along their transitions to determine the presence of well-defined vortic...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Magnetic-flux periodic response of nanoperforated ultrathin superconducting films

et al. 2006

View full text Add to dashboard Cite

show abstract

“…1a). Also we shall discuss the recent angle dependent magnetoresistance (ADMR) data in Y 0.68 Pr 0.32 CuO 4 [40,41] and CeCoIn 5 [42], which provides strong support for dDW in these systems. Once one accepts the phase diagrams in Fig.…”

mentioning

confidence: 99%

Gossamer superconductivity, new paradigm?

Won¹,

Haas

Maki

et al. 2005

Physica Status Solidi (b)

View full text Add to dashboard Cite

Key words cuprate, d-wave superconductivity, d-wave density wave PACS 74.70.-b We shall review our recent works on d-wave density wave (dDW) and gossamer superconductivity (i.e. dwave superconductivity in the presence of dDW) in high-Tc cuprates and CeCoIn5. a) We show that both the giant Nernst effect and the angle dependent magnetoresistance (ADMR) in the pseudogap phases of the cuprates and CeCoIn5 are manifestations of dDW. b) The phase diagram of high-Tc cuprates is understood in terms of mean field theory, which includes two order parameters ∆1 and ∆2, where one order paremeter is from dDW and the other from d-wave superconductivity. c) In the optimally to the overdoped region we find the spatially periodic dDW, an analogue of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, becomes more stable. d) In the underdoped region where ∆2/∆1 ≪ 1 the Uemera relation is obtained within the present model. We speculate that the gossamer superconductivity is at the heart of high-Tc cuprate superconductors, the heavy-fermion superconductor CeCoIn5 and the organic superconductors κ-(ET)2Cu(NCS)2 and (TMTSF)2PF6.

show abstract

“…Indeed the giant Nernst effect observed in pss data will be provided by the publisher Fig. 1 The phase diagram for the high-Tc cuprates the underdoped region in LSCO, YBCO and Bi-2212 [16,17,18,19,20] and the angle-dependent magnetoresistance in Y 0.68 Pr 0.32 Ba 2 Cu 3 O 7 can be described consistently in terms of dDW [21,22]. If we accept that the pseudogap phase is dDW, we expect that d-wave superconductivity coexists with dDW.…”

Section: Introductionmentioning

confidence: 99%

New world of Gossamer superconductivity

Maki

Haas

Parker

et al. 2006

Phys. Status Solidi (c)

View full text Add to dashboard Cite

Key words cuprate, d-wave superconductivity, d-wave density wave PACS 74.70.-b Since the discovery of the high-Tc cuprate superconductor La2−xBaCuO4 in 1986 by Bednorz and Müller, controversy regarding the nature or origin of this remarkable superconductivity has continued. However, d-wave superconductivity in the hole-doped cuprates, arising due to the anti-paramagnon exchange, was established around 1994. More recently we have shown that the mean field theory, like the BCS theory of superconductivity and Landau's Fermi liquid theory are adequate to describe the cuprates. The keys for this development are the facts that a)the pseudogap phase is d-wave density wave (dDW) and that the high-Tc cuprate superconductivity is gossamer (i.e. it exists in the presence of dDW).

show abstract

Evidence for Vortices in the Pseudogap Region ofY1−xPrxBa2

Cited by 34 publications

References 20 publications

Magnetic-flux periodic response of nanoperforated ultrathin superconducting films

Magnetic-flux periodic response of nanoperforated ultrathin superconducting films

Gossamer superconductivity, new paradigm?

New world of Gossamer superconductivity

Contact Info

Product

Resources

About