A1 Journal article (refereed), original research

Boson-fermion fluctuation dominated model of the superconducting transition in hole-underdoped cuprates

Publication Details

Authors: Bodi A C, Laiho R, Lähderanta Erkki

Publisher: Elsevier

Publication year: 2004

Language: English

Related journal or series: Physica C: Superconductivity and its Applications

Volume number: 411

Issue number: 3-4

Start page: 107

End page: 113

Number of pages: 7

ISSN: 0921-4534

eISSN: 1873-2143

JUFO level of this publication: 0

Digital Object Identifier (DOI): http://dx.doi.org/10.1016/j.physc.2004.06.014

Open Access: Not an Open Access publication


Reliable correlation of simultaneously measured resistively,
susceptibility and specific heat critical parameters of hole-underdoped
YBCO permitted to establish a phenomenological model of
normal-superconductor transition. After the model, fluctuations of
quasifree electrons drives at T*TC
the appearance of paired charge carriers (pseudogap-PG) characterized
by partial coherence of the order parameter’s phase. The evolution of PG
state from T* ∼ 140 K to the critical temperature TC ∼ 92 K is connected to the average increase of the statistically distributed partial coherence lifetime (from τ ∼ ps to ∞) and coherence length (from λ ∼ nm to ∞) of the fluctuating precursor islands. In this dynamic process the specific heat’s maximum signals (at temperature TCC ∼ 93.6 K) the appearance of the first mesoscopic coherent islands. TC
marks the percolation of these islands. We believe that the presented
concept of dynamical evolution (in coherence time and space from 0 to ∞)
of the paired charge structures is a promising scenario while
describing the properties of hole doped high-TC superconductors between the temperatures T* and TC.

Last updated on 2019-14-10 at 14:37