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セガワ コウジ
SEGAWA KOJI
瀬川 耕司 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2005/08 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Electrodynamics of the nodal metal state in weakly doped high-T-c cuprates |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW B |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 72(5) |
| 著者・共著者 | YS Lee,K Segawa,ZQ Li,WJ Padilla,M Dumm,SV Dordevic,CC Homes,Y Ando,DN Basov |
| 概要 | We report on the detailed analysis of the infrared (IR) conductivity of two prototypical high-T-c systems YBa2Cu3Oy and La2-xSrxCuO4 throughout the complex phase diagram of these compounds. Our focus in this work is to thoroughly document the electromagnetic response of the nodal metal state which is initiated with only a few holes doped in parent antiferromagnetic systems and extends up to the pseudogap boundary in the phase diagram. The key signature of the nodal metal is the two-component conductivity: the Drude mode at low energies followed by a resonance in mid-IR. The Drude component can be attributed to the response of coherent quasiparticles residing on the Fermi arcs detected in photoemission experiments. The microscopic origin of the mid-IR band is yet to be understood. A combination of transport and IR data uncovers fingerprints of the Fermi liquid behavior in the response of the nodal metal. The comprehensive nature of the data sets presented in this work allows us to critically re-evaluate common approaches to the interpretation of the optical data. Specifically we re-examine the role of magnetic excitations in generating electronic self-energy effects through the analysis of the IR data in a high magnetic field. |
| DOI | 10.1103/PhysRevB.72.054529 |
| ISSN | 2469-9950/2469-9969 |