Speaker
Rafael Winkler
Description
Blue Bronze ($K_{0.3}MoO_3$) is a quasi 1D material exhibiting a charge density wave with a periodic lattice distortion (PLD). In a time resolved x-ray experiment at SwissFEL, we study the dynamics of the PLD by pumping $K_{0.3}MoO_3$ with short laser pulses and probing it using x-ray diffraction. We construct reciprocal space maps (RSM) of superlattice reflections at different delays. The RSM along the surface normal gets broader at the delay equal to half the amplitude mode oscillation period, indicating a transient inversion of the PLD. For longer delays, this broadening is not visible. However, the diffracted x-ray intensity drops below the unpumped value indicating a molten CDW near the surface.
Author
Rafael Winkler
Co-authors
Larissa Boie
(ETH Zurich)
Dr
Yunpei Deng
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland.)
Matteo Savoini
(ETH Zurich)
Serhane Zerdane
(Paul Scherrer Institut (PSI))
Dr
Abhishek Nag
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland.)
Dr
Sabina Gurung
Davide Soranzio
(ETH Zurich)
Tim Suter
(ETH Zurich)
Vladimir Ovuka
Janine Dössegger
(ETH Zurich)
Elsa Souto Gonçalves de Abreu
(ETHZ - ETH Zurich)
Dr
Simone Biasco
Dr
Roman Mankowsky
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland)
Edwin J. Divall
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland)
Alexander R. Oggenfuss
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland)
Dr
Mathias Sander
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland.)
Dr
Christopher Arrell
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland)
Dr
Danylo Babich
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland)
Dr
Henrik T. Lemke
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland)
Dr
Paul Beaud
(SwissFEL, Paul Scherrer Institute, Villigen, Switzerland)
Dr
Urs Staub
(Paul Scherrer Institute, Villigen, Switzerland)
Prof.
Jure Demsar
(Faculty Institute of Physics, Johannes Gutenberg-University Mainz)
Steven Johnson
(ETHZ - ETH Zurich)
