Precursor effects of the superconducting state caused by d-wave phase-fluctuations above Tc

Abstract

One of the hallmarks of high-temperature superconductors is a pseudogap regime appearing in the underdoped cuprates above the superconducting transition temperature Tc. The pseudogap continously develops out of the superconducting gap. In addition, high-frequency conductivity experiments show a superconducting scaling of the optical response in the pseudogap regime, pointing towards a superconducting origin of the pseudogap. The phase-fluctuation vortex scenario is further supported by the measurement of an unusually large Nernst signal above Tc and the recently observed field-enhanced diamagnetism which scales with the Nernst signal. In this paper, we use a simple phenomenological model to calculate the paraconductivity and magnetic response caused by phase fluctuations of the superconducting order parameter above Tc. Our results are in agreement with experiments such as the superconducting scaling of the optical response and the spin (or Pauli) susceptibility, and further strengthen the idea of a phase-fluctuation origin of the pseudogap.

7 pages, 6 figures

References in corpus (7)

• Field-enhanced diamagnetism in intense magnetic field in the pseudogap state of the cuprate $\rm Bi_2Sr_2CaCu_2O_{8+δ}
• The high-field phase diagram of the cuprates derived from the Nernst effect
• Phase Fluctuations in Strongly Coupled $d$-Wave Superconductors
• Pair Phase Fluctuations and the Pseudogap
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• Fluctuating diamagnetism in underdoped high temperature superconductors
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Cited by in corpus (2)

• A competing order scenario of two-gap behavior in hole doped cuprates
• Theory of Diamagnetism in the Pseudogap Phase: Implications from the Self energy of Angle Resolved Photoemission