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2021.07.13 10:21
양자물질초전도연구실에서 서울대학교 물리천문학부 김창영 교수님을 초청하여 아래와 같이 세미나를 개최합니다.
학과 구성원 여러분의 많은 참여를 부탁 드립니다.
온-오프 혼합으로 진행되는 세미나입니다.
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○ Title: B1g phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa2Cu3O7−δ
○ Speaker: 김 창 영 교수님 (서울대학교 물리천문학부)
○ Date/time: 2021. 7. 14. (Wed.) 11:00AM
○ 온라인 참여방법: 아래의 WebEx 링크 접속
https://skku-ict.webex.com/meet/koko1977
○ Place: Natural Science 1, Room No. 31214
○ Abstract: We performed temperature- and doping-dependent high-resolution Raman spectroscopy experiments on YBa2Cu3O7−δ to study B1g phonons. The temperature dependence of the real part of the phonon self-energy shows a distinct kink at T = TB1g above Tc due to softening, in addition to the one due to the onset of the superconductivity. TB1g is clearly different from the pseudogap temperature with a maximum in the underdoped region. The region between TB1g and Tc resembles that of superconducting fluctuation or charge density wave order. While the true origin of the B1g phonon softening is not known, we can attribute it to a gap on the Fermi surface due to an electronic order. Our results may reveal the role of the B1g phonon not only in the superconducting state but also in the intertwined orders in multilayer copper oxide high-Tc superconductors
