A1 Journal article (refereed), original research

Simultaneous ac susceptibility and specific heat measurements of YBCO ceramics


LUT Authors / Editors

Publication Details
Authors: Bodi A C, Laiho R, Lähderanta Erkki
Publisher: Springer Verlag (Germany)
Publication year: 2004
Language: English
Related Journal or Series Information: Journal of Superconductivity and Novel Magnetism
Volume number: 17
Issue number: 3
Start page: 465
End page: 468
Number of pages: 4
ISSN: 1557-1939
eISSN: 1557-1947
JUFO-Level of this publication: 0
Open Access: Not an Open Access publication

Abstract

Simultaneous ac magnetic susceptibility and specific heat studies of
YBCO ceramics permitted the correct correlation of the corresponding
critical temperatures. The midpoint of the real component (χ′) and the
maximum of the imaginary component (χ′′) of ac susceptibility curves
confirmed the Tc = 92 K critical temperature value determined by dc resistance measurements. The specific heat maximum's temperature (Tcc ∼ 93.6 K)—-taken as the calorimetric critical one—fell between Tc and T* (the pseudogap onset temperature). We suggest that Tcc signals the appearance of the first localized coherent pairs, while the temperature Tc
marks their percolation. The existence of two different critical
temperature values confirms the coexistence of partial coherent and
coherent electron pairing phenomena in the region below Tcc of the superconducting phase diagram.


Last updated on 2019-30-09 at 13:27