Focused-ion-beam assisted technique for achieving high pressure by uniaxial-pressure devices  

作　　者：刘迪 王兴玉 李泽众 马肖燕 李世亮 Di Liu;Xingyu Wang;Zezhong Li;Xiaoyan Ma;Shiliang Li(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2023年第4期622-626,共5页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1403402,2021YFA1400401, 2020YFA0406003, and 2017YFA0302903);the National Natural Science Foundation of China (Grant Nos. 11961160699 and 11874401);the Chinese Academy of Sciences (Grant Nos. XDB33000000 and GJTD-2020-01)。

摘　　要：Uniaxial pressure or strain can introduce a symmetry-breaking distortion on the lattice and may alter the ground states of a material. Compared to hydrostatic pressure, a unique feature of the uniaxial-pressure measurements is that a tensile force can be applied and thus a “negative” pressure can be achieved. In doing so, both ends of the sample are usually glued on the frame of the uniaxial-pressure device. The maximum force that can be applied onto the sample is sometimes limited by the shear strength of the glue, the quality of the interface between the sample and the glue, etc. Here we use focused ion beam to reduce the width of the middle part of the sample, which can significantly increase the effective pressure applied on the sample. By applying this technique to a home-made piezobender-based uniaxial-pressure device, we can easily increase the effective pressure by one or two orders of magnitude as shown by the change of the superconducting transition temperature of an iron-based superconductor. Our method thus provides a possible way to increase the upper limit of the pressure for the uniaxial-pressure devices.

关 键 词：uniaxial pressure iron-based superconductors FOCUSED-ION-BEAM 

分 类 号：O469[理学—凝聚态物理]