Seminar Notice

Speaker Prof. Johan Chang (University of Zurich)
Date & Time 2019.04.22, 16:00~17:30
Place Bldg. 19, Rm. 210
Title From Mott physics to high-temperature superconductivity
Contents

Correlated electron systems offer a wealth of useful and conceptually interesting material properties, such as unconventional superconductivity, giant magneto-resistance and colossal thermopower [1,2]. This talk presents recent synchrotron experiments on systems where the electron-lattice coupling play an important role in defining the ground state. After a general introduction to the topic, three model examples will be given. (a) The nature of the Mott-insulating ground state of Ca 2 RuO 4 and La 2 CuO 4 will discussed [3-5]. (b) New insights to the hidden order phase of URu 2 Si 2 are going to be presented [6] and finally (c) recent advances on the interplay between charge ordering and high temperature superconductivity in YBa 2 Cu 3 O 6.67 are being put forward [7]. On this journey across important correlated electron problems, synchrotron techniques such as angle-resolved photoemission spectroscopy (ARPES), resonant inelastic x-ray scattering (RIXS) and non-resonant hard x-ray scattering will be introduced.  

[1] Dagatto, Science 309 , 257-262 (2005)

[2] J. Mannhart & D. G. Schlom, Science  327 , 1607-1611 (2010)

[3] O. Ivashko et al. , Nature Communications 10 , 786 (2019) 

[4] L. Das et al ., Physical Review X 8 , 11048  (2018) 

[5] D. Sutter et al ., Nature Communications 8 , 15176 (2017) 

[6] J. Choi et al ., Physical Review B 98 , 241113(R) (2018) 

[7] J. Choi et al ., In preparation