[1]朱静波,黄桂芹.MgB2薄膜的超导电性[J].南京师大学报(自然科学版),2008,31(01):58-61.
　Zhu Jingbo,Huang Guiqin.The Superconductivity in MgB2 Film[J].Journal of Nanjing Normal University(Natural Science Edition),2008,31(01):58-61.
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MgB2薄膜的超导电性()
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《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

卷:
第31卷
期数:
2008年01期
页码:
58-61
栏目:
物理学
出版日期:
2008-03-30

文章信息/Info

Title:
The Superconductivity in MgB2 Film
作者:
朱静波;黄桂芹;
南京师范大学物理科学与技术学院, 江苏南京210097
Author(s):
Zhu Jingbo; Huang Guiqin
School of Physical Science and Technology, Nanjing Normal University, Nanjing 210097, China
关键词:
MgB薄膜;  电—声子相互作用;  密度泛函微扰理论
Keywords:
M gB2 film;  electron-phonon interaction;  density- functional pe rturba tion theory
分类号:
O484.4
摘要:
采用平面波赝势方法计算了MgB2超导薄膜的电子结构.结果发现,表面层B(S)在费米能级处的态密度显著增强.在线性响应的密度泛函微扰理论框架下计算了MgB2薄膜的动力学性质及电—声子相互作用,分析了MgB2超导薄膜在Γ点的振动模的频率.结果发现,MgB2薄膜中的声子存在软化现象,并且声子的软化提高了电-声子相互作用,从而增强了薄膜的超导电性.
Abstract:
U sing pseudopo tential m ethod, the e lec tron ic struc ture ofM gB2 film is stud ied. It is found that the density o f sta tes at the Ferm i level o f the surface B atom has large enhancem ent. U sing the dens ity- functional perturbation theo ry by the linea r responsem ethod, the lattice dynam ics and the electron-phonon interaction o fM gB2 film are studied. The v-i brational frequenc ies at the # po in t o fM gB2 film are ana ly zed. The results show that the phonons in the film becom e soft, and th is softness increases the electron-phonon interaction, resu lting in the enhancem ent of the superconductiv ity o f M gB2 film.

参考文献/References:

[ 1] Nagama tsu J, N akag aw aN, M uranaka T, et a.l Supe rconductiv ity at 39 K in m agnesium dibor ide[M ]. Na ture, 2001, 410 ( 6824) : 63-64.
[ 2] 吕玉鹏, 黄桂芹. 新型超导体材料M gB2 电子结构随压强的变化关系[ J]. 南京师大学报: 自然科学版, 2001, 24( 4): 53-56.
[ 3] Buzea C, Yam ashita T. Rev iew o f superconducting properties o fM gB2 [ J] . Supercond Sc iTechno,l 2001, 14( 11): R115- R146.
[ 4] K ang W N, K im H J, Cho iEM, et a.l MgB2 superconduc ting th in film s w ith a transition tem perature o f 39 ke lvin[ J] . Sc-i ence, 2001, 292( 5521): 1 521-1 523.
[ 5] O rr B G, Jaeg erH M, Go ldm an A M. Transition-temperature oscillations in th in superconducting films[ J]. Phys Rev Lett, 1984, 53( 21): 2 046-2 049.
[ 6] Ja lochow skiM, H offm anM, Bauer E. Quantized ha ll effect in ultrath in m eta llic film s[ J]. Phys Rev Lett, 1996, 76( 22): 4 227-4 229.
[ 7] Guo Y, Zhang Y F, Bao X Y, et a .l Supe rconductiv ity m odu lated by quantum size effec ts [ J] . Sc ience, 2004, 306 ( 5703) : 1 915-1 917.
[ 8] Savrasov S Y. Linear-response theo ry and lattice dynam ics: A m uffin- tin) orb ita l approach [ J]. Phys Rev B, 1996, 54( 23) : 16 470-16 486. [ 9] K im In Gee, Lee J I, M in B
I, e t a.l Surface electronic structures o f superconducting thin film M gB2 ( 0001) [ J] . Phys Rev B, 2001, 64( 2): 020508- 1-020508- 4.
[ 10] Baroni S, G ironco li S de, Corso A Da ,l et a.l Phonons and re lated cry sta l properties from dens ity- functional perturbation theo ry[ J] . RevM od Phy s, 2001, 73( 2): 515-562.
[ 11] Vande rbilt D. Soft se l-f cons isten t pseudopotentials in a g eneralized e igenva lue form a lism [ J]. Phys Rev B, 1990, 41( 11): 7 892-7 895.
[ 12] Perdew J P, Burke K, Ernze rho fM. Genera lized g radien t approx im ation m ade sim ple[ J]. Phys Rev Lett, 1996, 77( 18): 3 865-3 868.
[ 13] M onkhorst H J, Park J D. Spec ia l po ints fo r Br illou in-zone integrations[ J]. Phys Rev B, 1976, 13( 12): 5 188-5 192.
[ 14] Kroumova E, et a.l B ilbao crysta llog raph ic se rver: useful da tabases and too ls for phase- transition studies[ J]. Phase Trans-i tions, 2003, 76( 1 /2), 155-170.
[ 15] Kong Y, Do lgov O, Jepsen O, et a.l E lectron-phonon interaction in the no rm al and superconducting states o fM gB2 [ J]. Phys Rev B, 2001, 64( 2): 020501- 1-020501-4.

备注/Memo

备注/Memo:
基金项目: 国家自然科学基金科学部主任基金( 10447115)资助项目.
作者简介: 朱静波( 1984- ) , 女, 硕士研究生, 研究方向: 凝聚态物理. E-m ail: jingbo19840602@ s ina. com
通讯联系人: 黄桂芹( 1969- ) , 副教授, 研究方向: 凝聚态物理. E-m ail:huanggu iq in@ n jnu. edu. cn
更新日期/Last Update: 2013-05-05