Journal Article

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2021-07-23
09:06
[PUBDB-2021-03035] Journal Article
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Autocatalytic Formation of High‐Entropy Alloy Nanoparticles
Angewandte Chemie 132(49), 22104 - 22108 () [10.1002/ange.202009002]  GO
High-entropy alloy (HEA) nanoparticles hold great promise as tunable catalysts, and surprisingly, Pt-Ir-Pd-Rh-Ru nanoparticles can be synthesized under benign low-temperature solvothermal conditions. In situ X-ray scattering and TEM reveal the solvothermal formation mechanism of Pt-Ir-Pd-Rh-Ru nanoparticles. [...]
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2021-07-23
09:01
OpenAccess [PUBDB-2021-03034] Journal Article
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High-temperature treatments of niobium under high vacuum, dilute air- and nitrogen-atmospheres as investigated by in situ X-ray absorption spectroscopy
Niobium metal foils were heat-treated at 900°C under different conditions and in situ investigated with time-resolved X-ray absorption fine-structure (EXAFS and XANES) measurements. The present study aims to mimic the conditions usually applied for heat treatments of Nb materials used for superconducting radiofrequency cavities, in order to better understand the evolving processes during vacuum annealing as well as for heat treatments in controlled dilute gases [...]
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2021-07-22
11:42
OpenAccess [PUBDB-2021-03027] Journal Article
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Bulk spin polarization of magnetite from spin-resolved hard x-ray photoelectron spectroscopy
Physical review / B 104(4), 045129 (1-10) () [10.1103/PhysRevB.104.045129]  GO
There is broad consensus that magnetite (Fe$_3$O$_4$) is a promising material for spintronics applications due to its high degree of spin polarization at the Fermi level. However, previous attempts to measure the spin polarization by spin-resolved photoemission spectroscopy have been hampered by the use of low photon energies resulting in high surface sensitivity. [...]
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2021-07-20
11:15
OpenAccess [PUBDB-2021-03018] Journal Article
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Novel Tunnel Magnetoresistive Sensor Functionalities via Oblique-Incidence Deposition
Controlling the magnetic properties of ultrathin films remains one of the main challenges to the further development of tunnel magnetoresistive (TMR) device applications. The magnetic response in such devices is mainly governed by extending the primary TMR trilayer with the use of suitable contact materials. [...]
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2021-07-19
17:02
DBCoverage [PUBDB-2021-03012] Journal Article
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Momentum-space signatures of Berry flux monopoles in the Weyl semimetal TaAs
Since the early days of Dirac flux quantization, magnetic monopoles have been sought after as a potential corollary of quantized electric charge. As opposed to magnetic monopoles embedded into the theory of electromagnetism, Weyl semimetals (WSM) exhibit Berry flux monopoles in reciprocal parameter space. [...]
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2021-07-19
16:51
[PUBDB-2021-03011] Journal Article
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Survival of Floquet–Bloch States in the Presence of Scattering
Nano letters 21(12), 5028 - 5035 () [10.1021/acs.nanolett.1c00801]  GO
Floquet theory has spawned many exciting possibilities for electronic structure control with light, with enormous potential for future applications. The experimental demonstration in solids, however, remains largely unrealized. [...]
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2021-07-14
13:05
OpenAccess [PUBDB-2021-02976] Journal Article
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Photophilic hadronic axion from heavy magnetic monopoles
[21-046; DESY-21-046; arXiv:2104.02574]
We propose a model for the QCD axion which is realized through a coupling of the Peccei-Quinn scalar field to magnetically charged fermions at high energies. We show that the axion of this model solves the strong CP problem and then integrate out heavy magnetic monopoles using the Schwinger proper time method. [...]
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2021-07-12
16:12
OpenAccess [PUBDB-2021-02963] Journal Article
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Iterated integrals over letters induced by quadratic forms
[DESY-21-031; DO–TH 21/05; RISC-Linz Report Series No. 21-05; SAGEX-21-05; arXiv:2103.08330]
Physical review / D 103(9), 096025 (1-11) () [10.1103/PhysRevD.103.096025]  GO
An automated treatment of iterated integrals based on letters induced by real-valued quadratic forms and Kummer–Poincaré letters is presented. These quantities emerge in analytic single and multiscale Feynman diagram calculations. [...]
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2021-07-12
15:56
OpenAccess [PUBDB-2021-02962] Journal Article
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TAIGA—An Innovative Hybrid Array for High Energy Gamma Astronomy, Cosmic Ray Physics and Astroparticle Physics
20th International Seminar on High Energy Physics, Quarks 2018, ValdayValday, Russian Federation, 27 May 2018 - 2 Jun 20182018-05-272018-06-02 Physics of atomic nuclei 191(3), 362 - 367 () [10.1134/S1063778821030078]  GO
The physics motivations and advantages of the hybrid detector complex TAIGA are presented. TAIGA aims to address gamma-ray astronomy at energies from a few TeV to several PeV units, as well as cosmic-ray physics from 100 TeV to several EeV units and astroparticle physics problems. [...]
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2021-07-12
15:49
OpenAccess [PUBDB-2021-02961] Journal Article
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Study of energy response and resolution of the ATLAS Tile Calorimeter to hadrons of energies from 16 to 30 GeV
[arXiv:2102.04088]
Three spare modules of the ATLAS Tile Calorimeter were exposed to test beams from the Super Proton Synchrotron accelerator at CERN in 2017. The detector’s measurements of the energy response and resolution to positive pions and kaons, and protons with energies ranging from 16 to 30 GeV are reported. [...]
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