本文利用X射线衍射、电阻率测量等实验手段对Ru1-xSbxSr2Gd1.4Ce0.6Cu2O10-δ(Ru-1222)体系的结构和正常态性质进行了研究.结果表明,Sb掺杂明显抑制超导电性,这可能是由于Sb掺杂引起体系无序度增加,另一方面,Sb在Ru位的掺杂可加剧RuO6八面体的变形,从而使CuO2面的空穴载流子被磁捕获或磁散射的程度增加.Sb掺杂导致载流子被无序散射和磁捕获或磁散射,这些都会阻碍载流子的运动,使载流子局域化.样品在铁磁转变点温度以下的正常态电阻率可由可变程跃迁模型很好地描述.发现局域化长度随着掺杂而降低,这表明空穴局域化程度随着无序度的增加而提高.样品在铁磁转变点温度以上的正常态电阻率可由小极化子跃迁模型很好地描述.
参考文献
| [1] | Y Furukawa;S Takada;A Yamanaka;K Kumagai .[J].PHYSICA C,2000,341:453. |
| [2] | C Bernhard;J L Tallon;Ch Niedermayer;Th Blasius A Golnik E Brucher R K Kermer D R Noakes C E Stronach E J Ansaldo .[J].Physical Review B,1999,59:14099. |
| [3] | C Bernhard;J L Tallon;E Brucher;R K Kermer .[J].Physical Review B,2000,61:R14960. |
| [4] | J L Tallon;J W Loram;G V M Williams;C Bernhard .[J].Physical Review B,2000,61:R6471. |
| [5] | I Felner;U Asaf;Y Levi;O Millo .[J].Physical Review B,1997,55:3374. |
| [6] | L Bauernfeind;W Widder;H F Braun .[J].PHYSICA C,1995,254:151. |
| [7] | I Felner;U Asaf;S Reich;Y Tsabba .[J].PHYSICA C,1999,311:163. |
| [8] | W E Pickett;R Weht;A B Shick .[J].Physical Review Letters,1999,83:3713. |
| [9] | E B Sonin;I Felner .[J].Physical Review B,1998,57:R14000. |
| [10] | A C Mclaughlin;W Zhou;J P Attfield;A N Fitch J L Tallon .[J].Physical Review B,1999,60:7512. |
| [11] | I Felner;U Asaf;Y Levi;O Millo .[J].PHYSICA C,2000,334:141. |
| [12] | J Dzyaloshinsky .[J].Journal of Physics and Chemistry of Solids,1958,4:241. |
| [13] | O Chmaissem;J D Jorgensen;H Shaked;P Dollar J L Tallon .[J].Physical Review B,2000,61:6401. |
| [14] | N F Mott.Metal-Insulator Translation[M].Talor and Francis,London,1990 |
| [15] | N F Mott;E Davis.Electronic Processes in noncrystalline Materials[M].Oxford University Press Inc,1971 |
| [16] | P H Wagner;V Metlushko;L Trappeniers;A Vantomme J Vanacken G Kido V V Moshchalkov Y Bruynseraede .[J].Physical Review B,1997,55:3699. |
| [17] | G V M Williams;M Ryan .[J].Physical Review B,2001,64:194515-1. |
| [18] | Cox P A.The Electronic Structure and Chemistry of Solids[M].Oxford:Oxford University Press,1987:179. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%