Anisotropic phase diagram and strong coupling effects in Ba1-xKxFe2As2 from specific-heat measurements
文献类型：期刊论文
| 作者 | Welp, U ; Xie, R ; Koshelev, AE ; Kwok, WK ; Luo, HQ ; Wang, ZS ; Mu, G ; Wen, HH |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2009 |
| 卷号 | 79期号:9 |
| 关键词 | NODELESS SUPERCONDUCTING GAPS MAGNETIC-FIELD SINGLE-CRYSTAL LAO1-XFXFEAS TRANSITION COMPOUND 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 a thermodynamic study of the phase diagram of single-crystal Ba1-xKxFe2As2 using specific-heat measurements. In zero-magnetic field a clear step in the heat capacity of Delta C/T-c=0.1 J/mol K-2 is observed at T-c approximate to 34.6 K for a sample with x=0.4. This material is characterized by extraordinarily high slopes of the upper critical field of mu(0)partial derivative H-c2(c)/partial derivative T=-6.5 T/K and mu(0)partial derivative H-c2(ab)/partial derivative T=-17.4 T/K and a surprisingly low anisotropy of Gamma similar to 2.6 near T-c. A consequence of the large field scale is the effective suppression of superconducting fluctuations. Using thermodynamic relations we determine Ginzburg-Landau parameters of kappa(c)similar to 100 and kappa(ab)similar to 260 identifying Ba1-xKxFe2As2 as extreme type II. The large value of the normalized discontinuity of the slopes of the specific heat at T-c, (T-c/Delta C)Delta(dC/dT)(Tc)similar to 6, indicates strong-coupling effects in Ba1-xKxFe2As2. |
| 收录类别 | SCI |
| 资助信息 | U. S. Department of Energy Basic Energy Science [DE-AC02-06CH11357]; Natural Science Foundation of China; Ministry of Science and Technology of China [2006CB60100, 2006CB921802, 2006CB921107]; Chinese Academy of Sciences |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/33785]  |
| 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. Anisotropic phase diagram and strong coupling effects in Ba1-xKxFe2As2 from specific-heat measurements[J]. PHYSICAL REVIEW B,2009,79(9). |
| APA | Welp, U.,Xie, R.,Koshelev, AE.,Kwok, WK.,Luo, HQ.,...&Wen, HH.(2009).Anisotropic phase diagram and strong coupling effects in Ba1-xKxFe2As2 from specific-heat measurements.PHYSICAL REVIEW B,79(9). |
| MLA | Welp, U,et al."Anisotropic phase diagram and strong coupling effects in Ba1-xKxFe2As2 from specific-heat measurements".PHYSICAL REVIEW B 79.9(2009). |
入库方式： OAI收割
来源：物理研究所
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