# Kooperativer Bibliotheksverbund

## Berlin Brandenburg

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• 1
Article
Language: English
In: Physical review letters, 29 March 2019, Vol.122(12), pp.123608
Description: By embedding a thin layer of tantalum in an x-ray cavity, we observe a change in the spectral characteristics of an inner-shell transition of the metal. The interaction between the cavity mode vacuum and the L_{III}-edge transition is enhanced, permitting the observation of the collective Lamb shift, superradiance, and a Fano-like cavity-resonance interference effect. This experiment demonstrates the feasibility of cavity quantum electrodynamics with electronic resonances in the x-ray range with applications to manipulating and probing the electronic structure of condensed matter with high-resolution x-ray spectroscopy in an x-ray cavity setting.
Keywords: Tantalum ; Thin Films ; Quantum Theory ; Condensed Matter ; Quantum Electrodynamics ; Electronic Structure ; Spectral Control;
ISSN: 00319007
E-ISSN: 1079-7114
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• 2
Article
Language: English
In: Applied Physics Letters, 25 July 2016, Vol.109(4)
Description: We report on the quantitative determination of the transient surface temperature of Pt(110) upon nanosecond laser pulse heating. We find excellent agreement between heat transport theory and the experimentally determined transient surface temperature as obtained from time-resolved X-ray diffraction on timescales from hundred nanoseconds to milliseconds. Exact knowledge of the surface temperature's temporal evolution after laser excitation is crucial for future pump-probe experiments at synchrotron storage rings and X-ray free electron lasers.
Keywords: Nanoscale Science And Technology
ISSN: 0003-6951
E-ISSN: 1077-3118
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• 3
Article
Language: English
In: Journal of Crystal Growth, 15 October 2015, Vol.428, pp.40-45
Description: We report the growth, by the optical floating zone method of single crystals, showing for the first time the same magnetization as highly stoichiometric powder samples and sharp superstructure reflections in single crystal X-ray diffraction. The latter can be attributed to three dimensional long-range charge ordering. Resonant X-ray diffraction at the Fe -edge with full linear polarization analysis was used for the investigation of the possibility of orbital order.
Keywords: A1. X-Ray Diffraction ; A1. Charge Ordering ; A2. Floating Zone Technique ; B. Yfe2o4 ; B. Lufe2o4 ; B1. Rare Earth Compounds ; Engineering ; Chemistry
ISSN: 0022-0248
E-ISSN: 1873-5002
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• 4
Article
Language: English
In: Physical review letters, 06 March 2015, Vol.114(9), pp.097601
Description: High piezoelectric activity of many ferroelectrics has been the focus of numerous recent studies. The structural origin of this activity remains poorly understood due to a lack of appropriate experimental techniques and mixing of different mechanisms related to ferroelectricity and ferroelasticity. Our work reports on the study of a uniaxial Sr_{0.5}Ba_{0.5}Nb_{2}O_{6} ferroelectric where the formation of regions with different spontaneous strains is ruled out by the symmetry and where the interrelation between piezoelectricity and ferroelectricity can be inspected in an isolated fashion. We performed x-ray diffraction experiments on a single crystalline sample under alternating electric field and observed an unknown hidden-in-the-bulk mechanism, which suggests that the highest piezoelectric activity is realized in the volumes where nucleation of small ferroelectric domains takes place. This new mechanism creates a novel roadmap for designing materials with enhanced piezoelectric properties.
Keywords: Piezoelectricity ; Nucleation ; X-Rays ; Ferroelectric Materials ; Ferroelasticity ; Crystal Structure ; Ferroelectricity ; Diffraction ; Plasma Physics (General) (So) ; Physics (General) (Ah);
ISSN: 00319007
E-ISSN: 1079-7114
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• 5
Article
Language: English
In: Nano letters, 10 January 2018, Vol.18(1), pp.101-108
Description: We report on a growth study of self-catalyzed GaAs nanowires based on time-resolved in situ X-ray structure characterization during molecular-beam-epitaxy in combination with ex situ scanning-electron-microscopy. We reveal the evolution of nanowire radius and polytypism and distinguish radial growth processes responsible for tapering and side-wall growth. We interpret our results using a model for diameter self-stabilization processes during growth of self-catalyzed GaAs nanowires including the shape of the liquid Ga-droplet and its evolution during growth.
Keywords: Nanowires ; Growth ; in Situ X-Ray Diffraction ; Molecular Beam Epitaxy ; Polytypism ; Self-Catalyzed ; Tapering
ISSN: 15306984
E-ISSN: 1530-6992
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• 6
Article
In: Acta Crystallographica Section A Foundations of Crystallography, 08/2013, Vol.69(a1), pp.s622-s622
ISSN: 0108-7673
ISSN: 20532733
Source: International Union of Crystallography
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• 7
Article
Language: English
In: Physical Review B, 3/2017, Vol.95(10)
Description: We investigate whether the spin or charge degrees of freedom are responsible for the nodal gap in underdoped cuprates by performing inelastic neutron scattering and x-ray diffraction measurements on La$_{2-x}$Sr$_x$CuO$_4$, which is on the edge of the antiferromagnetic phase. We found that fluctuating incommensurate spin-density-wave (SDW) with a the bottom part of an hourglass dispersion exists even in this magnetic sample. The strongest component of these fluctuations diminishes at the same temperature where the nodal gap opens. X-ray scattering measurements on the same crystal show no signature of charge-density-wave (CDW). Therefore, we suggest that the nodal gap in the electronic band of this cuprate opens due to fluctuating SDW with no contribution from CDW.
Keywords: Condensed Matter - Superconductivity;
ISSN: 2469-9950
E-ISSN: 2469-9969
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• 8
Article
Description: We report on resonant magnetic x-ray scattering and absorption spectroscopy studies of exchange-coupled antiferromagnetic ordering of Eu$^{3+}$ magnetic moments in multiferroic Eu$_{1-x}$Y$_{x}$MnO$_3$ in the absence of an external magnetic field. The observed resonant spectrum is characteristic of a magnetically ordered $^7F_1$ state that mirrors the Mn magnetic ordering, due to exchange coupling between the Eu $4f$ and Mn $3d$ spins. This is the first observation of long range magnetic order generated by exchange coupling of magnetic moments of formally non-magnetic Van Vleck ions, which is a step further towards the realization of exotic phases induced by exchange coupling in systems entirely composed of non-magnetic ions. Comment: 5 pages, 3 figures, to be published in Physical Review B: Rapid Communications
Keywords: Condensed Matter - Strongly Correlated Electrons
ISSN: 10980121
E-ISSN: 1550235X
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• 9
Article
In: Phys. Rev. B 93, 214440 (2016)
Description: We present x-ray resonant magnetic reflectivity (XRMR) as a very sensitive tool to detect proximity induced interface spin polarization in Pt/Fe, Pt/Ni$_{33}$Fe$_{67}$, Pt/Ni$_{81}$Fe$_{19}$ (permalloy), and Pt/Ni bilayers. We demonstrate that a detailed analysis of the reflected x-ray intensity gives insight in the spatial distribution of the spin polarization of a non-magnetic metal across the interface to a ferromagnetic layer. The evaluation of the experimental results with simulations based on optical data from ab initio calculations provides the induced magnetic moment per Pt atom in the spin polarized volume adjacent to the ferromagnet. We find the largest spin polarization in Pt/Fe and a much smaller magnetic proximity effect in Pt/Ni. Additional XRMR experiments with varying photon energy are in good agreement with the theoretical predictions for the energy dependence of the magnetooptic parameters and allow identifying the optical dispersion $\delta$ and absorption $\beta$ across the Pt L3-absorption edge.
Keywords: Condensed Matter - Materials Science
ISSN: 24699950
E-ISSN: 24699969
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• 10
Article
In: Acta Crystallographica Section A Foundations and Advances, 08/2014, Vol.70(a1), pp.C1529-C1529
ISSN: Acta Crystallographica Section A Foundations and Advances
E-ISSN: 2053-2733
Source: International Union of Crystallography
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