Electronic structure of charge-spin stripe ordered high-Tc cuprates

2014 Fiscal Year Final Research Report

• Project/Area Number: 24740234
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Institute for Molecular Science (2014); Osaka University (2012-2013)
• Principal Investigator: TANAKA Kiyohisa 分子科学研究所, 極端紫外光研究施設, 准教授 (60511003)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 銅酸化物高温超伝導体 / 強相関電子系 / テラヘルツ / 光学測定

Outline of Final Research Achievements

In this research, I performed two powerful spectroscopy measurements (terahertz time-domain spectroscopy and angle-resolved photoemission spectroscopy (ARPES)) on charge-spin stripe ordered high-Tc cuprates to clarify the intrinsic electronic structure of stripe order. From terahertz time-domain spectroscopy, I found that the superconducting signal still survives in the extremely low energy region, where the conventional far-infrared spectroscopy can not detect. ARPES measurements reveals that the superconducting pair strength observed as a superconducting energy gap, is getting smaller with stabilizing stripe order. Our finding settle down the longstanding problem if the stripe order enhance or suppress the superconducting gap.

Free Research Field

物性物理学