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2012 ; 13
(5
): 054301
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Superconducting properties of iron chalcogenide thin films
#MMPMID27877514
Mele P
Sci Technol Adv Mater
2012[Oct]; 13
(5
): 054301
PMID27877514
show ga
Iron chalcogenides, binary FeSe, FeTe and ternary FeTe (x) Se(1-x) , FeTe (x)
S(1-x) and FeTe:O (x) , are the simplest compounds amongst the recently
discovered iron-based superconductors. Thin films of iron chalcogenides present
many attractive features that are covered in this review, such as: (i) easy
fabrication and epitaxial growth on common single-crystal substrates; (ii) strong
enhancement of superconducting transition temperature with respect to the bulk
parent compounds (in FeTe(0.5)Se(0.5), zero-resistance transition temperature
T(c0)(bulk) = 13.5 K, but T(c0)(film) = 19 K on LaAlO(3) substrate); (iii) high
critical current density (J(c) ? 0.5 ×10(6) A cm(2) at 4.2 K and 0 T for
FeTe(0.5)Se(0.5) film deposited on CaF(2), and similar values on flexible
metallic substrates (Hastelloy tapes buffered by ion-beam assisted deposition)
with a weak dependence on magnetic field; (iv) high upper critical field (?50 T
for FeTe(0.5)Se(0.5), B(c2)(0), with a low anisotropy, ? ? 2). These highlights
explain why thin films of iron chalcogenides have been widely studied in recent
years and are considered as promising materials for applications requiring high
magnetic fields (20-50 T) and low temperatures (2-10 K).
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