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Schaefer, F.; Timm, Carsten; Manske, Dirk

doi:10.1023/a:1022572322775

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…It would be desirable to include the pair-breaking effect of phase fluctuations and the possible formation of a charge-density wave on the same microscopic level as the spin fluctuations. 8 For T c ϽTϽT c * , where phase-coherent superconductivity is absent, phase fluctuations lead to a strong renormalization of n s /m* at frequencies much smaller than 2⌬ 0 . Our results show the same trends as found in conductivity measurements.…”

Section: Discussionmentioning

confidence: 97%

“…Between T c and T * c Cooper pairs exist but the order parameter is not phase coherent. 4,5,6,8,9 Recent thermal-expansion experiments strongly support this picture. 10 However, there is no close relation between our T * c and the mean-field transition temperature of Ref.…”

Section: Introductionmentioning

confidence: 91%

“…A field-theoretical derivation of the effective action of phase fluctuations 8,55,56,57 shows that the phase stiffness for frequency ω = 0 is given by the 3D static superfluid density divided by the effective mass, n s (x, T )/m * . This quantity is given by…”

Section: Static Casementioning

confidence: 99%

“…We expect the phase fluctuations in this regime to lead to pair breaking. 8 However, simulations of the XY model suggest that this feedback is rather weak. 68 Neglecting the feedback, the electronic spectral function shows the unrenormalized superconducting gap for T c < T < T * c .…”

Section: Static Casementioning

confidence: 99%

“…However, the inclusion of vortex fluctuations in a FLEX-type theory on equal footing with spin fluctuations would be a formidable task. 8…”

Section: Static Casementioning

confidence: 99%

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Phase diagram of underdoped cuprate superconductors: Effects of Cooper-pair phase fluctuations

2002

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In underdoped cuprates fluctuations of the phase of the superconducting order parameter play a role due to the small superfluid density. We consider the effects of phase fluctuations assuming the exchange of spin fluctuations to be the predominant pairing interaction. Spin fluctuations are treated in the fluctuation-exchange approximation, while phase fluctuations are included by Berezinskii-Kosterlitz-Thouless theory. We calculate the stiffness against phase fluctuations, n s ()/m*, as a function of doping, temperature, and frequency, taking its renormalization by phase fluctuations into account. The results are compared with recent measurements of the high-frequency conductivity. Furthermore, we obtain the temperature T*, where the density of states at the Fermi energy starts to be suppressed, the temperature T c * , where Cooper pairs form, and the superconducting transition temperature T c , where their phase becomes coherent. We find a crossover from a phase-fluctuationdominated regime with T c ϰn s for underdoped cuprates to a BCS-like regime for overdoped materials.

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Section: Discussionmentioning

confidence: 97%