نتایج جستجو برای: iron based superconductor
تعداد نتایج: 3065996 فیلتر نتایج به سال:
Abstract We fabricated two bulk superconductors of (Ba,Na)Fe 2 As using a cubic press and hot sintering technique. For #1 sintered by press, despite its small dimensions, with diameter 4.1 mm height 3.64 mm, trapped field value ~9.97 kG has been achieved on surface, which is only 230 G lower than the reported in 10 before. Critical current density ( J c ) estimated to be 81.2 kA cm −2 at 4.2 K ...
We report the iron (Fe) isotope effect on the transition temperature (T(c)) in oxygen-deficient SmFeAsO(1-y), a 50-K-class, Fe-based superconductor. For the optimally doped samples with T(c) = 54 K, a change of the average atomic mass of Fe (M(Fe)) causes a negligibly small shift in T(c), with the Fe isotope coefficient (α(Fe)) as small as -0.024 ± 0.015 (where α(Fe)=-d lnT(c)/dlnM(Fe)). This ...
In-plane resistivity measurements as a function of temperature and magnetic field up to 35 T with precise orientation within the crystallographic ac plane were used to study the upper critical field Hc2 of the holedoped iron-based superconductor Ba1−xKxFe2As2. Compositions of the samples studied spanned from underdoped x=0.17 (Tc=12 K) and x=0.22 (Tc=20 K), both in the coexistence range of stri...
We report polarized neutron scattering measurements of the low energy spin fluctuations iron-selenide superconductor Li$_{0.8}$Fe$_{0.2}$ODFeSe below and above its superconducting transition temperature $T_c=41$ K. Our experiments confirmed that resonance mode near 21 meV is magnetic. Moreover, excitations are essentially isotropic in space at 5$\leq E\leq$ 29 normal states. results suggest iro...
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