J4 ›› 2010, Vol. 48 ›› Issue (03): 468-472.

• 物理 • 上一篇    下一篇

用第一性原理研究Heusler合金Ni2MnAl的电子结构、 |压力响应及柔和四方变形

罗礼进1, 全宏瑞2, 仲崇贵1, 方靖淮1, 蒋青3, 江学范4   

  1.  1. 南通大学 理学院, 江苏 南通 226007|2. 桂林师范高等专科学校 物理与信息技术系, 广西 桂林 541001|3. 苏州大学 物理学院, 江苏 苏州 215006|4. 常熟理工学院 江苏省新型功能材料重点实验室, 江苏 常熟 215500
  • 收稿日期:2009-05-26 出版日期:2010-05-26 发布日期:2010-05-19
  • 通讯作者: 罗礼进 E-mail:luolijin1964@126.com

Electronic Structure, Response to Pressure and Soft Tetragonal Distortions for |Heusler Alloy Ni2MnAl Studied via First-Principles

LUO |Li jin1, QUAN |Hong rui2, ZHONG |Chong gui1, FANG Jing huai1, JIANG Qing3, JIANG |Xue fan4   

  1. 1. School of Science, Nantong University, Nantong 226007, Jiangsu Province, China|2. Department of Physics and Communication Technology, Guilin Normal College, Guilin 541001, Guangxi Zhuang Autonomous Region, China|3. Department of Physics, Suzhou University, Suzhou 215006, Jiangsu Province, China|4. Jiangsu Key Laboratory of Advanced Functional Materials, Changshu Institute of Technology, Changshu 215500, Jiangsu Province, China
  • Received:2009-05-26 Online:2010-05-26 Published:2010-05-19
  • Contact: LUO Li jin E-mail:luolijin1964@126.com

摘要:

运用基于密度泛函理论第一性原理的投影扩充波函数(PAW)方法, 计算了化学计量Ni2MnAl的晶体结构、 磁性、 电子结构、 压力响应以及柔和四方变形.  结果表明:  在Ni2MnAl的总磁矩中, Mn原子对总磁矩的贡献最大; 在Ni2MnAl的总态密度中, 低能部分主要由Al-s的投影态密度决定, 高能部分主要由Ni-d,Mn-d和Al-p的投影态密度决定; Ni和Mn原子间存在较强的键合, Al的p态和Mn的d态存在与自旋相关的杂化; 在Ni2MnAl的四方变形中,  0.95<c/a<1.10内存在一个变化平缓的能量面.

关键词: 第一性原理, 电子结构, 磁性, 压力响应, 柔和四方变形

Abstract:

Crystal structure, magnetism, electronic structure, response to pressure and soft tetragonal distortions of stoichiometric composition Ni2MnAl were calculated by means of first\|principles method the projected augmented wave (PAW) function based on  the density functional theory. The calculations show the contribution of the spin magnetic moments of Mn atom to the total moments is the largest for Ni2MnAl. The low energy part of the total DOS is  decided by Al\|s-projected DOS, however, the high energy part of the total DOS is  decided  by Ni\|d-projected DOS and Mn-d-projected DOS and Al-p-projected DOS for Ni2MnAl. The strong bonding exists between the Ni atom and the Mn atom, the spin correlation hybridization exists between the p state of Al and the d state of Mn. The entire energy surface for 0.95<c/a<1.10 is remarkably flat in tetragonal distortions for Ni2MnAl. 

Key words: first principles, electronic structure, magnetism, response to pressure, soft tetragonal distortions

中图分类号: 

  • O482.54