Electronic structure and superconducticity of the intermetallic compound MgB<sub>2</sub>

HU Baofu1 WANG Huixin1 LI Ming1 GE Yongxia2 WANG Haiying2 1

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Electronic structure and superconducticity of the intermetallic compound MgB₂

更新时间：2021-03-12

- Electronic structure and superconducticity of the intermetallic compound MgB₂
- NUCLEAR TECHNIQUES Vol. 32, Issue 10, (2009)
- 作者机构：
  
  1. 河南理工大学物理化学学院
  2. 河南师范大学物理与信息工程学院
- 作者简介：
- 基金信息：
  
  国家自然科学基金(60571063);河南省教育厅自然科学基金(2009A430012)资助
- DOI：
  CLC： TM26
- Published：01 October 2009
- 稿件说明：
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[1]胡保付,王会新,李明,葛永霞,王海英.金属间化合物MgB_2电子结构与超导电性的研究[J].核技术,2009,32(10):764-768.

HU Baofu1 WANG Huixin1 LI Ming1 GE Yongxia2 WANG Haiying2 1. Electronic structure and superconducticity of the intermetallic compound MgB₂[J]. Nuclear techniques, 2009, 32(10): 764-768.
[1]胡保付,王会新,李明,葛永霞,王海英.金属间化合物MgB_2电子结构与超导电性的研究[J].核技术,2009,32(10):764-768. DOI：

HU Baofu1 WANG Huixin1 LI Ming1 GE Yongxia2 WANG Haiying2 1. Electronic structure and superconducticity of the intermetallic compound MgB₂[J]. Nuclear techniques, 2009, 32(10): 764-768. DOI：

摘要

利用正电子湮没实验

结合理论模拟计算研究了金属间化合物MgB2系列样品。结果表明

在不同压强下

样品的电子结构发生了变化

Mg原子层电子向B原子层方向转移

与B原子层面上的空穴载流子复合

导致费米能级降低

其附近的态密度减小

使可配对电子减少;同时由于压力作用

样品材料晶格弹性减弱

电声耦合失匹

抑制了材料的超导电性。最后对激光辐照下的MgB2系列样品进行了分析

可能在一定光剂量范围内

有助于超导电性

过量的光子掺杂将会抑制其超导电性。

Abstract

In this paper

the intermetallic compound MgB2 systems are studied by positron annihilation and theoretical calculation.The results show that

under increasing pressure

the electronic structure changes

and the electrons transfer from Mg layers to B layers.The holes in the B layers are partially filled.Density of states of MgB2 near Fermi level decreases

hence the reduction of matching electrons.Because of the decreased flexibility of sample lattice and degree of electron-phonon coupling

the superconductivity can be inhibited.Based on the positron annihilation

we speculate that a proper dose of laser irradiation can improve the superconducting characteristics of MgB2 samples.

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Electronic structure and superconducticity of the intermetallic compound MgB2

DOI：

摘要

Abstract

关键词

Keywords

references

Electronic structure and superconducticity of the intermetallic compound MgB₂