Pairing Symmetry of Heavy Fermion Superconductivity in the Two-Dimensional Kondo-Heisenberg Lattice Model
文献类型：期刊论文
| 作者 | Liu, Y ; Zhang, GM ; Yu, L |
| 刊名 | CHINESE PHYSICS LETTERS
 |
| 出版日期 | 2014 |
| 卷号 | 31期号:8 |
| ISSN号 | 0256-307X |
| 通讯作者 | Zhang, GM (reprint author), Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China. |
| 中文摘要 | In the two-dimensional Kondo-Heisenberg lattice model away from half-filled, the local antiferromagnetic exchange coupling can provide the pairing mechanism of quasiparticles via the Kondo screening effect, leading to the heavy fermion superconductivity. We find that the pairing symmetry strongly depends on the Fermi surface (FS) structure in the normal metallic state. When J(H)/J(K) is very small, the FS is a small hole-like circle around the corner of the Brillouin zone, and the s-wave pairing symmetry has a lower ground state energy. For the intermediate coupling values of H-J/J(K), the extended s-wave pairing symmetry gives the favored ground state. However, when J(H)/J(K) is larger than a critical value, the FS transforms into four small hole pockets crossing the boundary of the magnetic Brillouin zone, and the d-wave pairing symmetry becomes more favorable. In that regime, the resulting superconducting state is characterized by either a nodal d-wave or nodeless d-wave state, depending on the conduction electron filling factor as well. A continuous phase transition exists between these two states. This result may be related to the phase transition of the nodal d-wave state to a fully gapped state, which has recently been observed in Yb-doped CeCoIn5. |
| 资助信息 | National Natural Science Foundation of China [20121302227, 11120101003, 11121063]; China Postdoctoral Science Foundation [2013M541069] |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59024]  |
| 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 | Liu, Y,Zhang, GM,Yu, L. Pairing Symmetry of Heavy Fermion Superconductivity in the Two-Dimensional Kondo-Heisenberg Lattice Model[J]. CHINESE PHYSICS LETTERS,2014,31(8). |
| APA | Liu, Y,Zhang, GM,&Yu, L.(2014).Pairing Symmetry of Heavy Fermion Superconductivity in the Two-Dimensional Kondo-Heisenberg Lattice Model.CHINESE PHYSICS LETTERS,31(8). |
| MLA | Liu, Y,et al."Pairing Symmetry of Heavy Fermion Superconductivity in the Two-Dimensional Kondo-Heisenberg Lattice Model".CHINESE PHYSICS LETTERS 31.8(2014). |
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来源：物理研究所
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