Magnetic field effects on $T_c$ and the pseudogap onset temperature in cuprate superconductors

Abstract

We study the sensitivity of $T_c$ and the pseudogap onset temperature, $T^{\ast }$, to low fields, $H$, for cuprate superconductors, using a BCS-based approach extended to arbitrary coupling. We find that $T^{\ast }$ and $T_c$, which are of the same superconducting origin, have very different $H$ dependences. The small coherence length makes $T^{\ast }$ rather insensitive to the field. However, the presence of the pseudogap at $T_c$ makes $T_c$ more sensitive to $H$. Our results for the coherence length $\xi$ fit well with existing experiments. We predict that very near the insulator $\xi$ will rapidly increase.

4 pages, 1 figure, contribution to the PPHMF-IV conference, Oct. 2001

References in corpus (4)

• Evidence for coexistence of the superconducting gap and the pseudo - gap in Bi-2212 from intrinsic tunneling spectroscopy
• Unusual thermodynamical and transport signatures of short coherence length superconductors: A BCS Bose-Einstein crossover approach
• The same superconducting criticality for underdoped and overdoped La_{2-x}Sr_xCuO_4 single crystals
• Magnetic Field Effects in the Pseudogap Phase: A Competing Energy Gap Scenario for Precursor Superconductivity