Quasiparticle density of states of 2H-NbSe2 single crystals revealed by low-temperature specific heat measurements according to a two-component model
文献类型：期刊论文
| 作者 | Yan, J ; Shan, L ; Wang, Y ; Xiao, ZL ; Wen, HH |
| 刊名 | CHINESE PHYSICS B
 |
| 出版日期 | 2008 |
| 卷号 | 17期号:6页码:2229 |
| 关键词 | S-WAVE SUPERCONDUCTORS VORTEX STATE DICHALCOGENIDES NBSE2 |
| ISSN号 | 1674-1056 |
| 通讯作者 | Wen, HH (reprint author), Chinese Acad Sci, Natl Lab Supercond, Inst Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | Low-temperature specific heat in a dichalcogenide superconductor 2H-NbSe2 is measured in various magnetic fields. It is found that the specific heat can be described very well by a simple model concerning two components corresponding to vortex normal core and ambient superconducting region, separately. For calculating the specific heat outside the vortex core region, we use the Bardeen-Cooper-Schrieffer (BCS) formalism under the assumption of a narrow distribution of the superconducting gaps. The field-dependent vortex core size in the mixed state of 2H-NbSe2, determined by using this model, can explain the nonlinear field dependence of specific heat coefficient gamma(H), which is in good agreement with the previous experimental results and more formal calculations. With the high-temperature specific heat data, we can find that, in the multi-band superconductor 2H-NbSe2, the recovered density of states (or Fermi surface) below T-c under a magnetic field seems not to be gapped again by the charge density wave (CDW) gap, which suggests that the superconducting gap and the CDW gap may open on different Fermi surface sheets. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/51795]  |
| 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 | Yan, J,Shan, L,Wang, Y,et al. Quasiparticle density of states of 2H-NbSe2 single crystals revealed by low-temperature specific heat measurements according to a two-component model[J]. CHINESE PHYSICS B,2008,17(6):2229. |
| APA | Yan, J,Shan, L,Wang, Y,Xiao, ZL,&Wen, HH.(2008).Quasiparticle density of states of 2H-NbSe2 single crystals revealed by low-temperature specific heat measurements according to a two-component model.CHINESE PHYSICS B,17(6),2229. |
| MLA | Yan, J,et al."Quasiparticle density of states of 2H-NbSe2 single crystals revealed by low-temperature specific heat measurements according to a two-component model".CHINESE PHYSICS B 17.6(2008):2229. |
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来源：物理研究所
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