The UE46 PGM-1 beamline at BESSY II

Weschke, E.; Schierle, E.

doi:10.17815/jlsrf-4-77

Cited by 14 publications

(9 citation statements)

References 23 publications

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“…Resonant elastic X-ray scattering (REXS) study of the Bragg peak at x = 0.5 The Bragg peak of the x = 0.5 NYN trilayer due to the Cu density wave order at Q || ≈ −0.096 r.l.u. and its unusual polarization dependence have also been observed with REXS experiments 26,27 . In a REXS experiment the energy of the diffracted X-rays is not analyzed, the Bragg peak of the elastic signal is therefore superimposed on a background that includes the inelastic signal and thus is larger than in RIXS.…”

Section: Resultssupporting

confidence: 54%

Long-ranged Cu-based order with $$d_{z^2}$$ orbital character at a YBa2Cu3O7/ manganite interface

et al. 2021

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The interplay of nearly degenerate orders in quantum materials can lead to a myriad of emergent phases. A prominent case is that of the high-Tc cuprates for which the relationship between superconductivity and a short-ranged, incommensurate charge density wave in the CuO2 planes involving the $$d_{x^2 - y^2}$$ d x 2 − y 2 orbitals (Cu-CDW) is a subject of great current interest. Strong modifications of the strength and coherence of this Cu-CDW have been achieved by applying large magnetic fields, uniaxial pressure, or via the interfacial coupling in cuprate/manganite multilayers. However, such modifications do not alter the dominant orbital character. Here we investigate cuprate/manganite multilayers with resonant inelastic X-ray scattering (RIXS) and show that a new kind of Cu-based density wave order can be induced that has not been previously observed in the cuprates. This order has an unusually small in-plane wave vector in the range of Q|| < 0.1 reciprocal lattice units (r.l.u.), a large correlation length of about 40 nm, and a predominant $$d_{z^2}$$ d z 2 orbital character, instead of the typical $$d_{x^2 - y^2}$$ d x 2 − y 2 one. Its appearance is determined by the hole doping of the manganite which is a key parameter controlling the interfacial charge transfer and orbital reconstruction. We anticipate that the observation of a previously unknown type of density wave order at the YBCO interface will allow for fresh perspectives on the enigmatic relation between superconductivity and charge order (CO) in the cuprates.

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Section: Resultssupporting

confidence: 54%

Long-ranged Cu-based order with $$d_{z^2}$$ orbital character at a YBa2Cu3O7/ manganite interface

et al. 2021

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“…Resonant magnetic x-ray diffraction measurements at the Co L 3 absorption edge have been carried out on the high field diffractometer at the UE46_PGM1 beamline of BESSY II synchrotron, at Helmholtz Zentrum Berlin [30]. Incident linear and circular polarized x rays were used at energies around the Co L 2,3 edge.…”

Section: Rsxs On Ge-cco and Pure Cco Under High Magnetic Fieldsmentioning

confidence: 99%

Magnetic field dependent cycloidal rotation in pristine and Ge-doped CoCr2O4

et al. 2021

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We report a soft x-ray resonant magnetic scattering study of the spin configuration in multiferroic thin films of Co 0.975 Ge 0.025 Cr 2 O 4 (Ge-CCO) and CoCr 2 O 4 (CCO) under low and high magnetic fields from 0.2 to 6.5 T. A characterization of Ge-CCO at a low magnetic field was performed, and the results were compared with those of pure CCO. The ferrimagnetic phase transition temperature T C ≈ 95 K and the multiferroic transition temperature T S ≈ 27 K in Ge-CCO are comparable with those observed in CCO. In Ge-CCO, the ordering wave vector (qq0) observed below T S is slightly larger compared with that of CCO, and unlike CCO, the diffraction intensity consists of two contributions that show a dissimilar x-ray polarization dependence. In Ge-CCO, the coercive field observed at low temperatures was larger than the one reported for CCO. In both compounds, an unexpected reversal of the spiral helicity, and therefore the electric polarization, was observed on simply magnetic field cooling. In addition, we find a change in the helicity as a function of momentum transfer in the magnetic diffraction peak of Ge-CCO, indicative of the presence of multiple magnetic spirals.

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“…[22] . XAS studies of Dy 2 ScN-SAM were performed at the UE46_PGM-1 beamline [19] at BESSY II (Helmholtz-Zentrum Berlin) and the X-Treme beamline at the Swiss Light Source (Paul Scherrer Institute). [20] XNLD and XMCD experiments at two beamlines with fresh Dy 2 ScN-SAM samples prepared immediately before the measurements demonstrated good reproducibility of the procedure (Figure S10, Supporting Information).…”

Section: Doi: 101002/advs202000777mentioning

confidence: 99%

Magnetic Hysteresis at 10 K in Single Molecule Magnet Self‐Assembled on Gold

et al. 2021

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Tremendous progress in the development of single molecule magnets (SMMs) raises the question of their device integration. On this route, understanding the properties of low‐dimensional assemblies of SMMs, in particular in contact with electrodes, is a necessary but difficult step. Here, it is shown that fullerene SMM self‐assembled on metal substrate from solution retains magnetic hysteresis up to 10 K. Fullerene‐SMM DySc2N@C80 and Dy2ScN@C80 are derivatized to introduce a thioacetate group, which is used to graft SMMs on gold. Magnetic properties of grafted SMMs are studied by X‐ray magnetic circular dichroism and compared to the films of nonderivatized fullerenes prepared by sublimation. In self‐assembled films, the magnetic moments of the Dy ions are preferentially aligned parallel to the surface, which is different from the disordered orientation of endohedral clusters in nonfunctionalized fullerenes. Whereas chemical derivatization reduces the blocking temperature of magnetization and narrows the hysteresis of Dy2ScN@C80, for DySc2N@C80 equally broad hysteresis is observed as in the fullerene multilayer. Magnetic bistability in the DySc2N@C80 grafted on gold is sustained up to 10 K. This study demonstrates that self‐assembly of fullerene‐SMM derivatives offers a facile solution‐based procedure for the preparation of functional magnetic sub‐monolayers with excellent SMM performance.

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The UE46 PGM-1 beamline at BESSY II

Cited by 14 publications

References 23 publications

Long-ranged Cu-based order with $$d_{z^2}$$ orbital character at a YBa2Cu3O7/ manganite interface

Long-ranged Cu-based order with $$d_{z^2}$$ orbital character at a YBa2Cu3O7/ manganite interface

Magnetic field dependent cycloidal rotation in pristine and Ge-doped CoCr2O4

Magnetic Hysteresis at 10 K in Single Molecule Magnet Self‐Assembled on Gold

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