文章信息/Info

Title:

鐵基超導體材料和物理研究

作者:

聞海虎

南京大學物理學院，江蘇省南京市漢口路22號

Author(s):

聞海虎

 

關鍵詞:

鐵基超導體; 材料結構類型綜述; 配對機制; 應用展望

DOI:

10.7502/j.issn.1674-3962.2015.01.07

文獻標志碼:

A

摘要:

自從2008年初在鐵砷/鐵鹵（FeAs/FeSe）基的材料中發(fā)現高溫超導電性以來，已經有至少7種結構類型的材料被合成出來了。其中在1111體系中，電阻和磁化測量得到的超導轉變溫度可達56K，而且有跡象表明超導溫度有可能會繼續(xù)升高。在鐵基超導體的正常態(tài)，很多非常規(guī)電子特性，如反鐵磁和四方-正交結構相變等也被觀察到。鐵基超導體是典型的多帶超導體，具有較長的相干長度，近三維電子特性，很高的上臨界磁場和不可逆磁場和很強的磁通釘扎能力，因此它們在強磁場方面有很好的應用前景。本文簡單綜述了鐵基超導材料的結構類型，分別對幾種主要的結構類型的性質進行了描述，然后對電子配對的機理問題作了比較詳盡的描述。最后結合臨界電流和臨界磁場行為，對鐵基超導體的應用前景提出展望。

Abstract:

Since the discovery of high temperature superconductivity in the iron pnictide/ chalcogenide materials, at least there are seven related structural types have been fabricated. In the 1111 system, the highest superconducting transition temperature (Tc) measured by resistivity and magnetization can reach 56 K. There are some hints that the Tc can be increased to higher values. The iron based superconductors have multiband feature. Many unconventional electronic properties in the normal state of iron based superconductors have been discovered. The iron based superconductors have relatively longer coherence length, more three dimensional electronic property, higher upper critical field and irreversibility field, very strong flux pinning, therefore they have the great potential for applications for producing high magnetic field. In this short overview, we will give a brief survey about the development of materials and physics of iron based superconductors. We give detailed descriptions on the properties for several kinds of materials with the major structures. In addition, we will give a introduction about the present understanding of the pairing mechanism. Finally we will try to give a perspective on the potential applications of the iron based superconductors.