TY  - JOUR
A1  - Reinhardt, Matthias
A1  - Koc, Azize
A1  - Leitenberger, Wolfram
A1  - Gaal, Peter
A1  - Bargheer, Matias
T1  - Optimized spatial overlap in optical pump-X-ray probe experiments with high repetition rate using laser-induced surface distortions
JF  - Journal of synchrotron radiation
N2  - Ultrafast X-ray diffraction experiments require careful adjustment of the spatial overlap between the optical excitation and the X-ray probe pulse. This is especially challenging at high laser repetition rates. Sample distortions caused by the large heat load on the sample and the relatively low optical energy per pulse lead to only tiny signal changes. In consequence, this results in small footprints of the optical excitation on the sample, which turns the adjustment of the overlap difficult. Here a method for reliable overlap adjustment based on reciprocal space mapping of a laser excited thin film is presented.
KW  - ultrafast X-ray diffraction
KW  - nanostructures
KW  - surface deformation
KW  - heat diffusion
KW  - optical pump
Y1  - 2016
U6  - https://doi.org/10.1107/S1600577515024443
SN  - 1600-5775
VL  - 23
SP  - 474
EP  - 479
PB  - International Union of Crystallography
CY  - Chester
ER  - 
TY  - JOUR
A1  - Roshchupkin, Dmitry
A1  - Ortega, Luc
A1  - Plotitcyna, Olga
A1  - Erko, Alexei
A1  - Zizak, Ivo
A1  - Vadilonga, Simone
A1  - Irzhak, Dmitry
A1  - Emelin, Evgenii
A1  - Buzanov, Oleg
A1  - Leitenberger, Wolfram
T1  - Piezoelectric Ca3NbGa3Si2O14 crystal: crystal growth, piezoelectric and acoustic properties
JF  - Journal of geophysical research : Space physics
N2  - Ca3NbGa3Si2O14 (CNGS), a five-component crystal of lanthanum-gallium silicate group, was grown by the Czochralski method. The parameters of the elementary unit cell of the crystal were measured by powder diffraction. The independent piezoelectric strain coefficients d(11) and d(14) were determined by the triple-axis X-ray diffraction in the Bragg and Laue geometries. Excitation and propagation of surface acoustic waves (SAW) were studied by high-resolution X-ray diffraction at BESSY II synchrotron radiation source. The velocity of SAW propagation and power flow angles in the Y-, X-and yxl/+36 degrees-cuts of the CNGS crystal were determined from the analysis of the diffraction spectra. The CNGS crystal was found practically isotropic by its acoustic properties.
Y1  - 2016
U6  - https://doi.org/10.1007/s00339-016-0279-1
SN  - 0947-8396
SN  - 1432-0630
VL  - 122
SP  - 2803
EP  - 2812
PB  - Springer
CY  - New York
ER  - 
TY  - JOUR
A1  - von Reppert, Alexander
A1  - Pudell, Jan-Etienne
A1  - Koc, A.
A1  - Reinhardt, M.
A1  - Leitenberger, Wolfram
A1  - Dumesnil, K.
A1  - Zamponi, Flavio
A1  - Bargheer, Matias
T1  - Persistent nonequilibrium dynamics of the thermal energies in the spin and phonon systems of an antiferromagnet
JF  - Structural dynamics
N2  - We present a temperature and fluence dependent Ultrafast X-Ray Diffraction study of a laser-heated antiferromagnetic dysprosium thin film. The loss of antiferromagnetic order is evidenced by a pronounced lattice contraction. We devise a method to determine the energy flow between the phonon and spin system from calibrated Bragg peak positions in thermal equilibrium. Reestablishing the magnetic order is much slower than the cooling of the lattice, especially around the Neel temperature. Despite the pronounced magnetostriction, the transfer of energy from the spin system to the phonons in Dy is slow after the spin-order is lost. (C) 2016 Author(s).
Y1  - 2016
U6  - https://doi.org/10.1063/1.4961253
SN  - 2329-7778
VL  - 3
PB  - American Institute of Physics
CY  - Melville
ER  - 
TY  - GEN
A1  - von Reppert, Alexander
A1  - Puddell, J.
A1  - Koc, A.
A1  - Reinhardt, M.
A1  - Leitenberger, Wolfram
A1  - Dumesnil, K.
A1  - Zamponi, Flavio
A1  - Bargheer, Matias
T1  - Persistent nonequilibrium dynamics of the thermal energies in the spin and phonon systems of an antiferromagnet
N2  - We present a temperature and fluence dependent Ultrafast X-Ray Diffraction study of a laser-heated antiferromagnetic dysprosium thin film. The loss of antiferromagnetic order is evidenced by a pronounced lattice contraction. We devise a method to determine the energy flow between the phonon and spin system from calibrated Bragg peak positions in thermal equilibrium. Reestablishing the magnetic order is much slower than the cooling of the lattice, especially around the Néel temperature. Despite the pronounced magnetostriction, the transfer of energy from the spin system to the phonons in Dy is slow after the spin-order is lost.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 272 
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-98710
ER  - 
TY  - JOUR
A1  - von Reppert, Alexander
A1  - Puddell, J.
A1  - Koc, A.
A1  - Reinhardt, M.
A1  - Leitenberger, Wolfram
A1  - Dumesnil, K.
A1  - Zamponi, Flavio
A1  - Bargheer, Matias
T1  - Persistent nonequilibrium dynamics of the thermal energies in the spin and phonon systems of an antiferromagnet
JF  - Structural dynamics
N2  - We present a temperature and fluence dependent Ultrafast X-Ray Diffraction study of a laser-heated antiferromagnetic dysprosium thin film. The loss of antiferromagnetic order is evidenced by a pronounced lattice contraction. We devise a method to determine the energy flow between the phonon and spin system from calibrated Bragg peak positions in thermal equilibrium. Reestablishing the magnetic order is much slower than the cooling of the lattice, especially around the Néel temperature. Despite the pronounced magnetostriction, the transfer of energy from the spin system to the phonons in Dy is slow after the spin-order is lost.
Y1  - 2016
U6  - https://doi.org/10.1063/1.4961253
SN  - 2329-7778
VL  - 3
PB  - AIP Publishing LLC
CY  - Melville, NY
ER  -