Magnetic Field Effects in the Pseudogap Phase: A Precursor Superconductivity Scenario

Abstract

We demonstrate that the observed dependences of $T_c$ and $T^{\ast }$ on small magnetic fields can be readily understood in a precursor superconductivity approach to the pseudogap phase. In this approach, the presence of a pseudogap at $T_c$ (but not at $T^{\ast }$) and the associated suppression of the density of states lead to very different sensitivities to pair-breaking perturbations for the two temperatures. Our semi-quantitative results address the puzzling experimental observation that the coherence length $\xi$ is weakly dependent on hole concentration $x$ throughout most of the phase diagram. We present our results in a form which can be compared with the recent experiments of Shibauchi et al, and argue that orbital effects contribute in an important way to the $H$ dependence of $T^{\ast }$.

6 pages, 1 figure, elsart.cls included. Submitted to the proceeding of SNS 2001, Chicago

References in corpus (8)

• Hidden Order in the Cuprates
• The Unusual Superconducting State of Underdoped Cuprates
• Pairing Fluctuation Theory of Superconducting Properties in Underdoped to Overdoped Cuprates
• Closing the Pseudogap by Zeeman Splitting in Bi_2Sr_2CaCu_2O_8+y at High Magnetic Fields
• Superconducting transitions from the pseudogap state: d-wave symmetry, lattice, and low-dimensional effects
• Unusual thermodynamical and transport signatures of short coherence length superconductors: A BCS Bose-Einstein crossover approach
• Magnetic Field Effects in the Pseudogap Phase: A Competing Energy Gap Scenario for Precursor Superconductivity
• Effect of Magnetic field on the Pseudogap Phenomena in High-Tc Cuprates

Cited by in corpus (1)

• Zeeman and Orbital Limiting Fields: Separated Spin and Charge Degrees of Freedom in Cuprate Superconductors