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Superconductivity suppression and peak resistivity enhancement for thin crystals of κ‐(BEDT‐TTF) 2 Cu(SCN) 2
Author(s) -
Bardin A. A.,
Burn P. L.,
Lo S.C.,
Powell B. J.
Publication year - 2012
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201100711
Subject(s) - electrical resistivity and conductivity , wafer , superconductivity , thin film , materials science , condensed matter physics , analytical chemistry (journal) , crystal (programming language) , mineralogy , chemistry , nanotechnology , physics , quantum mechanics , chromatography , computer science , programming language
Thick (100–130µm) crystals of κ ‐(BEDT‐TTF) 2 Cu(SCN) 2 show maximum of ρ ( T ) dependence at 100 K (2.5–2.8 times larger than their resistivity at 298 K) and reproducible T c (onset) at 10.4 K. Thin (2–5 µm) crystals attached to a SiO 2 wafer demonstrated profound enhancement of peak resistivity near 100 K (up to 3000 times greater than their room temperature resistivity). Further, superconductivity is absent in the thin films. We argue that these effects are due to ‘negative pressure’ (about −2.5 kbar at 100 K) caused by the large difference in the thermal expansion coefficients of SiO 2 and κ ‐(BEDT‐TTF) 2 Cu(SCN) 2 .Thin single crystal on Au patterned Si/SiO 2 wafer.