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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 | 2010/02 |
| 形態種別 | 研究論文 |
| 標題 | Possibility of magnetic-field-induced reconstruction of the Fermi surface in underdoped cuprates: Constraints from infrared magneto-optics |
| 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 | 81(6) |
| 著者・共著者 | A. D. LaForge,A. A. Schafgans,S. V. Dordevic,W. J. Padilla,K. S. Burch,Z. Q. Li,Kouji Segawa,Seiki Komiya,Yoichi Ando,J. M. Tranquada,D. N. Basov |
| 概要 | We present an analysis of infrared optical and magneto-optical conductivity data for a range of underdoped cuprate superconductors including YBa(2)Cu(3)O(y) and La(2-x)Sr(x)CuO(4). In light of recent magneto-oscillation experiments which have been interpreted in terms of Fermi surface reconstruction in magnetic field, we search for far-infrared signatures of field-induced pockets of coherent quasiparticles. Analysis of the conductivity spectra in magnetic field reveals no sign of field-induced Drude-like response, as well as no evidence for modification of the pseudogap. By considering changes of the low-frequency spectral weight, we are able to place limits on the oscillator strength of coherent modes deriving from proposed field-induced pockets in the Fermi surface. In underdoped La(2-x)Sr(x)CuO(4) we observe a complete suppression of the superfluid density but no evidence for a coherent contribution to the conductivity. Other limits are established for YBa(2)Cu(3)O(y). We further discuss these results in the context of cuprate systems in which stripe order can account for the observed nodal effects but does not lead to the development of antinodal pockets with long-lived quasiparticles. |
| DOI | 10.1103/PhysRevB.81.064510 |
| ISSN | 1098-0121 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77954822824&origin=inward |