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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 | 2009/03/03 |
| 形態種別 | 研究論文 |
| 標題 | Magnetic field induced modification of superfluid density and interplane spectral weight in YBa2 Cu3 Oy |
| 執筆形態 | その他 |
| 掲載誌名 | Physical Review B - Condensed Matter and Materials Physics |
| 巻・号・頁 | 79(10) |
| 著者・共著者 | A. D. Laforge,W. J. Padilla,K. S. Burch,Z. Q. Li,A. A. Schafgans,Kouji Segawa,Yoichi Ando,D. N. Basov |
| 概要 | We report on the interlayer infrared response of YBa2 Cu3 Oy in an applied magnetic field. This study explores both the underdoped (y=6.67 and 6.75) and optimally doped (y=6.95) regions of the phase diagram, and includes data for fields applied both parallel to the c axis and to the CuO2 planes in this anisotropic superconductor. We focus on the transfer of optical conductivity spectral weight from high-frequency regions of the spectrum to the nondissipative superconducting condensate, and examine the effect of magnetic field upon this process. A sum-rule analysis reveals that magnetic fields H/c eliminate the high-frequency contribution to the superfluid density, returning the system to a more BCS-like energy scale. For fields H/ CuO2, however, the high-energy contribution scales with the superfluid density, and the anomalous scheme of condensate formation is maintained, at least in underdoped y=6.67 and 6.75 samples. This behavior is discussed in relation to the change in electronic kinetic energy and shown to be closely related to the suppression of interplane phase coherence. © 2009 The American Physical Society. |
| DOI | 10.1103/PhysRevB.79.104516 |
| ISSN | 1098-0121 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=64849090471&origin=inward |