logo

korean english

게시판

Home > 게시판 > 세미나

양자물질초전도체창의연구소에서 Huazhong University of Science and Technology의 Yongkang Liu  교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁드립니다.

---------------------------------------------------------------------------------------------------------------------

Date/time: 4:00 pm, Oct 22nd, 2019

Place: 7th Floor of Samsung Library

Speaker: Prof. Yongkang Luo (Huazhong University of Science and Technology)

Title: To p or not to p? O NMR of Sr2RuO4 under strain

 

Abstract:  Sr2RuO4 stands for one of the most fascinating unconventional superconductors. Although it shares the same crystal structure with 214 cuprates, the Tc is much lower. At its early stage since its discovery, theorists predicted a chiral p-wave order parameter d=z ̂(kx+iky). Experimental evidence for such chiral-p wave came from both unchanged spin susceptibility across Tc and time-reversal symmetry breaking at superconducting state. However, there also accumulated other evidence against it. Recently, scientists at MPI Dresden found a strong Tc peak under uniaxial strain, which is consistent with approaching a γ Fermi sheet van-Hove singularity. The absence of Tc cusp near zero strain suggested that a simple chiral p-wave is unlikely. Bulk and local experimental probe is necessary to elucidate this issue. In this talk, I will present our recent 17O NMR measurements of Sr2RuO4 under strain in both normal and superconducting states. Pronounced drops across Tc in Knight shifts are observed at both zero and vHs strains. These results, although need a better understanding, seem to exclude chiral p-wave as the most promising candidate.


References:
[1] Y. Luo et al, Phys. Rev. X 9, 021044 (2019).
[2] A. Pustogow*, Y. Luo* et al, Nature 574, 72 (2019).

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1060590
622 <Oct.7(Wed.)>Organic Photodiode for Image Sensor 2020.09.24 56302
621 <Sep.23(Wed.)>나는 내 마음이야 2020.09.16 16428
620 <Sep.16(Wed.)>Artificial Crystal 2020.09.14 19421
619 <8/1(Sat.)> Recent Advances in Deep Learning 2020.07.29 31193
618 2020학년도 2학기 콜로퀴움 일정 2020.07.16 157723
617 <2/17(Mon.)> Magneto-optical study of the Dirac semimetal Cd3As2 in Voigt geometry 2020.02.11 79777
616 2020학년도 1학기 콜로퀴움 일정 2020.01.31 253543
615 <12/17(Tue.)> Nuclear spectroscopy with low energy reaction thermal neutrons in ILL 2019.12.17 66930
614 <12/10(Tue.)> Investigating dark matter signals at neutrino telescopes 2019.12.06 84525
613 <Dec.11(Wed.)>데이터 과학으로서의 물리학. 그리고 금융투자업 2019.12.04 46139
612 <12/6(Fri.)>topological phase transitions in Kitaev quantum spin liquids. 2019.12.04 71032
611 <Dec.4(Wed.)>2D materials based metasurfaces & THz near-field spectroscopy 2019.11.27 72669
610 <Nov.20(Wed.)>At the End of Space and Time: Imaging the Black Hole in M 87 2019.11.14 68158
609 <Nov.13(Wed.)>The Science of Quark-Gluon Plasma 2019.11.06 36035
608 <Oct.30(Wed.)> 왼손과 오른손, 기본 입자와 끈 2019.10.24 88537
» <10/22(Tue.)>To p or not to p? – 17O NMR of Sr2RuO4 under strain file 2019.10.17 87592
606 <Oct.16(Wed.)> 솟구치는 초고에너지 입자의 미스테리 2019.10.10 124865
605 <10/1(Tue.) Mini-Workshop on BSM Physics with Neutrino Detectors 2019.09.30 73359
604 <Oct.2(Wed.)> Fundamental physics with high-energy atmospheric and cosmic neutrinos today and in the future 2019.09.26 65924
603 <9/26(Thu.) 4:30 pm ~ > Neutrino Physics and Dark Matter search in IBS 2019.09.24 99532