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23 April 2024 |
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Article overview
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Molecular Beam Epitaxy Growth of Superconducting LiFeAs Film on SrTiO3(001) Substrate | | Kai Chang
; Peng Deng
; Teng Zhang
; Hai-Cheng Lin
; Kun Zhao
; Shuai-Hua Ji
; Lili Wang
; Ke He
; Xu-Cun Ma
; Xi Chen
; Qi-Kun Xue
; | | Date: |
11 Mar 2015 | | Abstract: | The stoichiometric "111" iron-based superconductor, LiFeAs, has attacted
great research interest in recent years. For the first time, we have
successfully grown LiFeAs thin film by molecular beam epitaxy (MBE) on
SrTiO3(001) substrate, and studied the interfacial growth behavior by
reflection high energy electron diffraction (RHEED) and low-temperature
scanning tunneling microscope (LT-STM). The effects of substrate temperature
and Li/Fe flux ratio were investigated. Uniform LiFeAs film as thin as 3
quintuple-layer (QL) is formed. Superconducting gap appears in LiFeAs films
thicker than 4 QL at 4.7 K. When the film is thicker than 13 QL, the
superconducting gap determined by the distance between coherence peaks is about
7 meV, close to the value of bulk material. The ex situ transport measurement
of thick LiFeAs film shows a sharp superconducting transition around 16 K. The
upper critical field, Hc2(0)=13.0 T, is estimated from the temperature
dependent magnetoresistance. The precise thickness and quality control of
LiFeAs film paves the road of growing similar ultrathin iron arsenide films. | | Source: | arXiv, 1503.3216 | | Services: | Forum | Review | PDF | Favorites | |
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