Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe$_{0.875}$Ti$_{0.125}$)$_2$As$_2$

We report the crystal growth of a new hole-doped iron-based superconductor Ba(Fe $_{0.875}$ Ti $_{0.125}$ ) $_{2}$ As $_{2}$ by substituting Ti on the Fe site. The crystals are accidentally obtained in trying to grow Ni doped Ba $_{2}$ Ti $_{2}$ Fe $_{2}$ As $_{4}$ O. After annealing at 500 \textcelsius $ $i n v a c u u m f o r o n e w e e k, s u p e r c o n d u c t i v i t y i s o b s e r v e d w i t h z e r o r e s i s t a n c e a t$ T_{c0} \approx 17.5 $K, a n d a b o u t 20 % d i a m a g n e t i c v o l u m e d o w n t o 2 K . W h i l e b o t h t h e s m a l l a n i s o t r o p y o f s u p e r c o n d u c t i v i t y a n d t h e t e m p e r a t u r e d e p e n d e n c e o f n o r m a l s t a t e r e s i s t i v i t y a r e a k i n t o t h e e l e c t r o n d o p e d 122 - t y p e c o m p o u n d s, t h e H a l l c o e f f i c i e n t i s p o s i t i v e a n d s i m i l a r t o t h e c a s e i n h o l e - d o p e d B a$ {0.9} $K$ {0.1} $F e$ 2 $A s$ 2 $. T h e d e n s i t y f u n c t i o n a l t h e o r y c a l c u l a t i o n s s u g g e s t d o m i n a t e d h o l e p o c k e t s c o n t r i b u t e d b y F e / T i 3$ d $o r b i t a l s . T h e r e f o r e, t h e B a (F e$ {1-x} $T i$ {x} $)$ _2 $A s$ _2$ system provides a new platform to study the superconductivity with hole doping on the Fe site of iron-based superconductors.

Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe $_{0.875}$ Ti $_{0.125}$ ) $_{2}$ As $_{2}$

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Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe $_{0.875}$ Ti $_{0.125}$ ) $_{2}$ As $_{2}$

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Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe0.8750.875​Ti0.1250.125​)22​As22​

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Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe0.8750.875​Ti0.1250.125​)22​As22​

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Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe $_{0.875}$ Ti $_{0.125}$ ) $_{2}$ As $_{2}$

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Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe $_{0.875}$ Ti $_{0.125}$ ) $_{2}$ As $_{2}$

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AI智能校验