Calorimetric determination of the upper critical fields and anisotropy of NdFeAsO1-xFx single crystals
文献类型：期刊论文
| 作者 | Welp, U ; Xie, R ; Koshelev, AE ; Kwok, WK ; Cheng, P ; Fang, L ; Wen, HH |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2008 |
| 卷号 | 78期号:14 |
| 关键词 | MAGNETIC-FIELD UNTWINNED YBA2CU3O7-DELTA LATENT-HEAT SUPERCONDUCTIVITY TRANSITION LAO1-XFXFEAS BEHAVIOR |
| ISSN号 | 1098-0121 |
| 通讯作者 | Welp, U: Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. |
| 中文摘要 | We present heat-capacity measurements of the upper critical fields of single-crystal NdFeAsO1-xFx. In zero-magnetic field a clear step in the heat capacity is observed at T-c approximate to 47 K. In fields applied perpendicular to the FeAs layers the step broadens significantly whereas for the in-plane orientation the field effects are small. This behavior is reminiscent of the CuO2-high-T-c superconductors and is a manifestation of pronounced fluctuation effects. Using an entropy conserving construction we determine the transition temperatures in applied fields and the upper critical-field slopes of partial derivative H-c2(c)/partial derivative T=-0.72 T/K and partial derivative H-c2(ab)/partial derivative T=-3.1 T/K. Zero-temperature coherence lengths of xi(ab)approximate to 3.7 nm and xi(c)approximate to 0.9 nm and a modest superconducting anisotropy of lambda similar to 4 can be deduced in a single-band model. |
| 收录类别 | SCI |
| 资助信息 | U.S. Department of Energy-Basic Energy Science [DEAC02-06CH11357]; Ministry of Science and Technology of China [2006CB60100, 2006CB921802, 2006CB921107] |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/34456]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Welp, U,Xie, R,Koshelev, AE,et al. Calorimetric determination of the upper critical fields and anisotropy of NdFeAsO1-xFx single crystals[J]. PHYSICAL REVIEW B,2008,78(14). |
| APA | Welp, U.,Xie, R.,Koshelev, AE.,Kwok, WK.,Cheng, P.,...&Wen, HH.(2008).Calorimetric determination of the upper critical fields and anisotropy of NdFeAsO1-xFx single crystals.PHYSICAL REVIEW B,78(14). |
| MLA | Welp, U,et al."Calorimetric determination of the upper critical fields and anisotropy of NdFeAsO1-xFx single crystals".PHYSICAL REVIEW B 78.14(2008). |
入库方式： OAI收割
来源：物理研究所
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