Superconductivity and thermal properties of sulphur doped FeTe with effect of oxygen post annealing

Autor:	Nanlin Wang, G. Bonsignore, G. F. Chen, A. Agliolo Gallitto M. Li Vigni, J. L. Luo, D. V. Shovkun
Rok vydání:	2011
Předmět:	Superconductivity Materials science Condensed matter physics Field (physics) Energy Engineering and Power Technology Intergranular corrosion Condensed Matter Physics Electronic Optical and Magnetic Materials Vortex Magnetic field Amplitude Cuprate Crystallite Electrical and Electronic Engineering
Zdroj:	Physica C: Superconductivity. 471:77-82
ISSN:	0921-4534
DOI:	10.1016/j.physc.2010.11.006
Popis:	The AC susceptibility at zero DC magnetic field of a polycrystalline sample of LaFeAsO_{0.94}F_{0.06} (T_c = 24 K) has been investigated as a function of the temperature, the amplitude of the AC magnetic field (in the range Hac = 0.003 - 4 Oe) and the frequency (in the range f = 10 kHz - 100 kHz). The temperature dependence of the AC susceptibility exhibits the typical two-step transition arising from the combined response of superconduncting grains and intergranular weak-coupled medium. The intergranular part of the susceptibility strongly depends on both the amplitude and the frequency of the AC driving field, from few Kelvin below T_c down to T = 4.2 K. Our results show that, in the investigated sample, the intergrain critical current is not determined by pinning of Josephson vortices but by Josephson critical current across neighboring grains.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::93427ce6c827f5c2c9204beaeb8a6943 https://doi.org/10.1016/j.physc.2010.11.006 Zobrazit plný text záznamu Full Text from ScienceDirect