korean english


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.

[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 1079021
266 <6/9> Status and Prospects of Big Science in Korea 2006.06.05 89682
265 <3/12> Where, when and how atomic nuclei were cooked in universe? 2014.03.07 89690
264 <May.9(Wed.) 4:30 PM> "How gold was produced in the universe?" 2018.05.02 89869
263 <1/14>Dark Matter signals from PAMELA and ATIC 2009.01.12 89875
262 2015학년도 2학기 콜로퀴움 일정 2015.08.06 90026
261 <4/16>같은 곳을 바라보는 다른 시선 2010.04.09 90099
260 <2/16>Hamiltonian formalism 2011.02.11 90248
259 <8/7> Scotch tape and spectroscopy: probing and manipulating the surface of a topological insulator 2012.07.27 90249
258 <5/3> APOLLO Program: Understanding Neutron-Rich Nuclei for r-Process Nucleosynthesis 2012.05.03 90287
257 <Oct.20(Tue) 10:00-12:00> Novel quantum transport in Weyl semimetals and double-Weyl semimetals 2015.10.23 90378
256 <3/21> 우주가속팽창의 원인 규명 2012.03.15 90531
255 <11/23> Hot/Dense QCD 2007.11.16 90644
254 <8/7> Scotch tape and spectroscopy: probing and manipulating the surface of a topological insulator 2012.07.27 90648
253 <8/17> Is Quantum Criticality a Key to Unconventional Superconductivity? 2006.08.09 90708
252 <5/7> Contribution of Internal and Surface Traps to Blinking Statistics in Colloidal Quantum Dots 2014.04.30 90867
251 <6/10> Traffic Problem in Physics and Its Application 2008.06.10 91041
250 <Sep. 9(Wed.) 4:30 PM> Electronic structures of strongly-correlated systems 2015.09.03 91086
249 <4/2> Supersymmetric vacua of mass-deformed M2-brane theory 2010.03.29 91153
248 <8/19(Mon) 13:30 ~ >Detection of cosmic rays in the PeV to EeV energy range file 2019.08.16 91207
247 <5/29> Study on the electronic interactions in solids under high magnetic fields 2013.05.23 91252