Abstract：
I will describe our recent effort on the study of selected superconductors on the border of structural order and magnetism using pressure as a tuning parameter. For the former, I will focus on the superconducting (Ca,Sr)3Rh4Sn13 and describe our effort to identify a structural quantum critical point using a combination of chemical pressure and physical pressure [1,2]. Using heat capacity, we further unravel the strong coupling nature of the superconducting state when the structural transition temperature is suppressed to 0 K [3,4]. The role of phonons on the evolution of both the normal state and the superconducting state properties will be presented based on our inelastic X-ray diffraction data [5]. For the latter, I will discuss our magnetotransport data in superconductor CrAs, in which we discovered a large, nonsaturating linear magnetoresistance in the normal state of high carrier-density metal CrAs [6], and compare it to the related composition CrP [7].
References:
[1] L. E. Klintberg et al., Phys. Rev. Lett. 109, 237008 (2012)
[2] S. K. Goh et al., Phys. Rev. Lett. 114, 097002 (2015)
[3] W. C. Yu et al., Phys. Rev. Lett. 115, 207003 (2015)
[4] Y. J. Hu et al., Phys. Rev. B 95, 155142 (2017)
[5] Y. W. Cheung et al., Phys. Rev. B 98, 161103 (R) (2018)
[6] Q. Niu et al., Nat. Commun. 8, 15358 (2017)
[7] Q. Niu et al., Phys. Rev. B 99, 125126 (2019)
Biography：
Dr. Goh received his PhD from Cavendish Laboratory, University of Cambridge in 2009. He has been a Trinity College Research Fellow from 2009-2013, and a Japan Society for the Promotion of Science fellow at Kyoto University from 2011-2012. Since 2013, he has been an Assistant Professor at The Chinese University of Hong Kong. His research interest includes the studies of correlated electron systems and topological materials under extreme conditions, such as high pressures, high magnetic field and low temperatures.
Seminar by the NYU-ECNU Institute of Physics at NYU Shanghai