The Superconductivity and Structural Properties in FeSe0.5Te0.5 with Sb and Sm Additions
Küçük Resim Yok
Tarih
2023
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Single crystals of FeSe0.5Te0.5 with additions of 4 wt.% Sb and 4 wt.% Sm were grown by self-flux synthesis method in order to study their influence on the superconducting characteristics. Scanning electron microscope and energy-dispersive x-ray spectroscopy (SEM/EDX) analyses show that the added Sm atoms mostly precipitate at the bottom and outer surfaces of the solidified ingot and could not be detected in the structure within the resolution limit of the EDX, while the Sb atoms lead to Sb precipitation regions on the boundary outlines of the lamellas. X-ray diffraction (XRD) patterns approve the presence of single tetragonal phase of FeSe0.5Te0.5 without any other impurity phases. Electrotransport and magnetic measurements reveal that the Sm-saturated FeSe0.5Te0.5 gives rise to significantly better superconducting performance in comparing with the undoped and Sb added samples. From electrical resistivity measurements, the onset (T-c(onset)) and zero-resistivity temperatures (T(c)z(ero)) appear at T-c(onset)=14.65, 14.36, and 15.2 K and T-c(zero)= 11.57, 12.05, and 13.79 K with corresponding transition widths of T=3.08, 2.31, and 1.41 K for the undoped and Sb and Sm doped samples, respectively. These values indicate the positive effects of the Sm saturation in critical transition temperatures with similar to 2.22 K increase in Tczero and 1.67 K decrease in T. The estimated magnetic critical current densities, Jcmag, through the Bean model and transport critical current densities, J(c)(trans), of the samples demonstrate that the Sm added sample produces up to similar to 7 times higher j(c) values with respect to those for the other two samples. The calculated Jcmag values are 3.8x10(4), 1.9x10(4), and 2.7x10(5) A/cm(2) at 5 K under 0.1 T for the undoped and Sb and Sm added samples, respectively.
Açıklama
Anahtar Kelimeler
FeSeTe Superconductivity, Iron selenide, Doping, Critical current density
Kaynak
Journal of Superconductivity and Novel Magnetism
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
