MGxB2起始成分对不可逆场和临界电流密度的影响

低温物理学报 , 2005, 27(z1): 854-858. doi: 10.3969/j.issn.1000-3258.2005.z1.089

MGxB2起始成分对不可逆场和临界电流密度的影响

王关生 ^1, , 许高杰 ^2, , 浦其荣 ^3, , 张建武 ^4, , ^5, , ^6, , 丁泽军 ^7,

1.中国科学院中国科学技术大学物理系,合肥,230026

2.中国科学院中国科学技术大学物理系,合肥,230026;Materials Research Department, Risoe National Laboratory, 4000 Roskilde, Denmark

3.中国科学院中国科学技术大学物理系,合肥,230026

4.中国科学院中国科学技术大学物理系,合肥,230026

5.Materials Research Department, Risoe National Laboratory, 4000 Roskilde, Denmark

6.Materials Research Department, Risoe National Laboratory, 4000 Roskilde, Denmark

7.中国科学院中国科学技术大学物理系,合肥,230026

关键词： MgxB2 , Jc , Hirr

EFFECT OF STARTING COMPOSITION ON IRREVERSIBILITY FIELD AND CRITICAL CURRENT DENSITY IN MgxB2

我们用固相反应法成功合成了MgxB2(0.5≤x≤1.3)系列样品,并对其结构,临界电流密度(Jc)和不可逆场(Hirr)进行了研究.实验结果表明,随着x增大晶格常数a逐渐增大,而晶格常数c在x=0.9左右达到最大值.所有x>0.5的样品在零场下的Jc值都在106A/cm2左右.然而在高磁场下,Mg缺位的样品的Jc值要比Mg富足的样品的Jc值大.20K时,Mg0.8B2样品的不可逆场达到最大值5.2T,比MgB2样品要高出0.8T.研究表明,高磁场下Hirr和Jc的增大可能与MgB4纳米粒子的形成有关.

参考文献

[1]	J Nagamatsu;N Nakagawa;T Muranaka;Y Zenitani,,J Akimitsu .[J].Nature,2001,410:63.
[2]	D C Larbarlestier;M O Rikel;M D Cooley .[J].Nature,2001,410:186.
[3]	Y Bugoslavsky;G K Perkins;X Qi;L F Colen,A D Caplin .[J].Nature,2001,410:563.
[4]	P Vase;R Flukiger;M Leghissa;B A Glowacki .[J].Superconductor Science and Technology,2000,13:R71.
[5]	T Takenobu;T Ito;Dam Hieu Chi;K Prassides,Y Iwasa .[J].Physical Review B,2001,64:134513.
[6]	W Mickelson;John Cumings;W Q Han;A Zettl .[J].Physical Review B,2002,65:052505.
[7]	Y Zhao;C H Cheng;T Machi;N Koshizuka M Murakami .[J].Physics Letters,2002,80:2311.
[8]	Y Feng;Y Zhao;Y P Sun;F C Liu B Q Fu L Zhou C H Cheng N Koshizuka M Murakami .[J].Physics Letters,2001,79:3983.
[9]	S X Dou;S Soltanian;J Horvat;X L Wang S H ,Zhou M,Lonescu H K ,Liu P Munroe,M Tomsic .[J].Physics Letters,2002,81:3419.
[10]	J Wang;Y Bugoslavsky;A Berenov;L Cowey A D Caplin L F Cohen L D Cooley X Song D C Larbalestier .[J].Physics Letters,2002,81:2026.
[11]	Y Bugoslavsky;L F Cohen;G K Perkins;M Polichetti,T J Tate,R Gwilliam,A D Caplin .[J].Nature,2001,411:561.
[12]	P Toulemonde;N Musolino;R Flukiger .High-pressure synthesis of pure and doped superconducting MgB_2 compounds[J].Superconductor Science & Technology,2003(2):231-236.
[13]	P. Toulemonde;N. Musolino;H. L. Suo;R. Flukiger .Superconductivity in high-pressure synthesized pure and doped MgB{sub}2 compounds[J].Journal of Superconductivity,2002(6):613-619.
[14]	Y Zhao;Y Feng;T Machi;C H Cheng,D X Huang,Y Fudamoto,N Koshizuka,M Murakami .[J].Europhysics Letters,2002,57:437.
[15]	S Soltanian;J Horvat;X L Wang;P Munroe S X Dou .[J].Physica C,2003,390:185.
[16]	Y G Zhao;X P Zhang;P T Qiao;H T Zhang S L Lia B S Cao M H Zhu Z H Han X L Wang B L Gu .[J].Physica C,2001,1:366.
[17]	D G Hinks;J D Jorgensen;H Zheng;S Short .[J].PHYSICA C,2002,382:166.
[18]	H Xiao;W Peng;W H Song;R C Ma L Zhang J J Du Y P Sun .[J].Physica C,2003,386:648.
[19]	C P Bean .[J].Physical Review Letters,1962,8:225.
[20]	A Serquis;L Civale;D L Hammon;J Y Coulter X Z Liao Y T Zhu .[J].Physics Letters,2003,82:1754.

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