Solid state synthesis and characterization of bulk FeTe0.5Se0.5 superconductors
Küçük Resim Yok
Tarih
2016
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Yayıncı
Iop Publishing Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
FeTe0.5Se0.5 polycrystalline superconductor samples were synthesized by solid-state reaction method at different heating temperatures. The morphological and structural characterization of FeTe0.5Se0.5 samples were carried out by X-rays Diffraction, Scanning Electron Microscope and Energy Dispersive X-ray Spectroscopy. The electrical, magnetic and thermal transport properties were investigated up to 8 T by using physical property measurement system. The results reveal that the sensitivity of electrical and magnetic properties strongly depends on the heat treatment cycles. The upper critical field, H-c2(0), was determined with the magnetic field parallel to the sample surface. It gives a maximum value of 36.3 T. The lower critical field, H-c1(T), was obtained as 210, 140 and 70 Oe at 5, 8 and 12 K, respectively. The coherence length, xi, at the zero field, was calculated to be 1.94 nm and suggested a transparent intergrain boundaries peculiarity. The mu H-0(c2)(0)/k(B)T(c) rate shows higher value (3.36 T/K) than the Pauli limit (1.84 T/K) which suggests unconventional nature of superconductivity for the polycrystalline FeTe0.5Se0.5 superconducting samples.
Açıklama
9th International Conference on Magnetic and Superconducting Materials (MSM) -- APR 30-MAY 03, 2015 -- Antalya, TURKEY
Anahtar Kelimeler
[No Keywords]
Kaynak
9th International Conference on Magnetic and Superconducting Materials (Msm15)
WoS Q Değeri
N/A
Scopus Q Değeri
N/A
Cilt
667
