113 citations · 411 across the 8 of their papers we have counts for
8 papers · 1 filter
Origin of the pseudogap phase: Precursor superconductivity versus a competing energy gap scenario
K. Levin, Qijin Chen, Ioan Kosztin +3
In the last few years evidence has been accumulating that there are a multiplicity of energy scales which characterize superconductivity in the underdoped cuprates. In contrast to…
Short Coherence Length Superconductivity: A Generalization of BCS Theory for the Underdoped Cuprates
K. Levin, Qijin Chen, Ioan Kosztin
On the basis of the observed short coherence lengths in the cuprates we argue that a BCS-Bose-Einstein condensation (BEC) crossover approach is an appropriate starting point for co…
Nodal Quasiparticles versus Phase Fluctuations in High Tc Superconductors: An Intermediate Scenario
Qijin Chen, Ioan Kosztin, K. Levin
We explore a BCS Bose Einstein crossover scenario for and its implications for the superfluid density and specific heat. The low lying excitations consist of no…
Unusual thermodynamical and transport signatures of short coherence length superconductors: A BCS Bose-Einstein crossover approach
Qijin Chen, Ioan Kosztin, K. Levin
In this paper we present predictions for thermodynamic and transport properties of a BCS Bose-Einstein crossover theory, below Tc, which theory satisfies the reasonable constraints…
Pair Excitations, Collective Modes and Gauge Invariance in the BCS -- Bose-Einstein Crossover Scenario
Ioan Kosztin, Qijin Chen, Ying-Jer Kao +1
In this paper we study the BCS Bose Einstein condensation (BEC) crossover scenario within the superconducting state, using a T-matrix approach which yields the ground state propose…
Pairing Fluctuation Theory of Superconducting Properties in Underdoped to Overdoped Cuprates
Qijin Chen, Ioan Kosztin, Boldizsar Janko +1
We propose a theoretical description of the superconducting state of under- to overdoped cuprates, based on the short coherence length of these materials and the associated strong…