1,624 research outputs found
Observation of ferromagnetic resonance in strontium ruthenate (SrRuO3)
We report the observation of ferromagnetic resonance (FMR) in SrRuO3 using
the time-resolved magneto-optical Kerr effect. The FMR oscillations in the
time-domain appear in response to a sudden, optically induced change in the
direction of easy-axis anistropy. The high FMR frequency, 250 GHz, and large
Gilbert damping parameter, alpha ~ 1, are consistent with strong spin-orbit
coupling. We find that the parameters associated with the magnetization
dynamics, including alpha, have a non-monotonic temperature dependence,
suggestive of a link to the anomalous Hall effect.Comment: submitted to Phys. Rev. Let
Spectroscopic Behaviour of Copper(II) Complexes Containing 2-Hydroxyphenones
Theoretical investigations by density functional theory (DFT) and time-dependent DFT
(TD-DFT) methods shed light on how the type of ligand or attached groups influence the electronic
structure, absorption spectrum, electron excitation, and intramolecular and interfacial electron
transfer of the Cu(II) complexes under study. The findings provide new insight into the designing
and screening of high-performance dyes for dye-sensitized solar cells (DSSCs)
Reduction Data Obtained from Cyclic Voltammetry of Benzophenones and Copper-2-Hydroxyphenone Complexes
This article provides detailed redox data on nine differently substituted benzophenones and
ten square planar copper(II) complexes containing 2-hydroxyphenones obtained by cyclic voltammetry
(CV) experiments. The information provided is related to the published full research articles âAn electrochemical and computational chemistry study of substituted benzophenonesâ (Electrochim. Acta 2021,
373, 137894) and âElectrochemical behaviour of copper(II) complexes containing 2-hydroxyphenonesâ
(Electrochim. Acta 2022, 424, 140629), where the CVs and electrochemical data at mainly one scan rate,
namely at 0.100 Vsâ1
, are reported. CVs and the related peak current and voltage values, not reported in
the related research article, are provided in this article for nine differently substituted benzophenones and
ten differently substituted copper-2-hydroxyphenone complexes at various scan rates over more than
two orders of magnitude. The redox data presented are the first reported complete set of electrochemical
data of nine 2-hydroxyphenones and ten copper(II) complexes containing 2-hydroxyphenone ligands
Determination of the spin-flip time in ferromagnetic SrRuO3 from time-resolved Kerr measurements
We report time-resolved Kerr effect measurements of magnetization dynamics in
ferromagnetic SrRuO3. We observe that the demagnetization time slows
substantially at temperatures within 15K of the Curie temperature, which is ~
150K. We analyze the data with a phenomenological model that relates the
demagnetization time to the spin flip time. In agreement with our observations
the model yields a demagnetization time that is inversely proportional to T-Tc.
We also make a direct comparison of the spin flip rate and the Gilbert damping
coefficient showing that their ratio very close to kBTc, indicating a common
origin for these phenomena
Influence of the carbonization degree of carbon nonwoven electrodes in vanadium redox flow batteries
High quality superconducting niobium films produced by Ultra High Vacuum Cathodic Arc
The vacuum arc is a well-known technique to produce coating with enhanced
adhesion and film density. Many cathodic arc deposition systems are actually in
use in industry and research. They all work under (high) vacuum conditions in
which water vapor pressure is an important source of film contamination,
especially in the pulsed arc mode of operation. Here we present a Cathodic Arc
system working under Ultra High Vacuum conditions (UHVCA). UHVCA has been used
to produce ultra-pure niobium films with excellent structural and electrical
properties at a deposition temperature lower than 100oC. The UHVCA technique
therefore opens new perspectives for all applications requiring ultra-pure
films or, as in the case of Plasma Immersion Ion Implantation, ultra-pure
plasmas.Comment: submitted to AP
Desulfovibrio idahonensis sp. nov., sulfatereducing bacteria isolated from a metal(loid)-contaminated freshwater sediment
Two novel sulfate-reducing bacteria, strains CY1 and CY2, were isolated from heavy-metal-contaminated sediments of Lake Coeur d\u27Alene, Idaho, USA. Strains CY1 and CY2 were found to contain c-type cytochromes and to reduce sulfate, sulfite, thiosulfate, elemental sulfur, DMSO, anthraquinone disulfonate and fumarate using lactate as an electron donor. In a comparison of 16S rRNA gene sequences, CY1 and CY2 were found to be 100% identical, but only 97 and 92.4% similar, respectively, to the type strains of Desulfovibrio mexicanus and Desulfovibrio aminophilus. Unlike these species, however, CY1 was neither able to disproportionate thiosulfate nor able to use yeast extract or amino acids as electron donors. These data, considered in conjunction with differences among strain CY1 and the two related type strains in chemotaxonomy, riboprint patterns, temperature and pH optima, support recognition of a distinct and novel species within the genus Desulfovibrio, Desulfovibrio idahonensis sp. nov., with the type strain CY1 (=DSM 15450 =JCM 14124 ). © 2009 IUMS. T T T T T T T
Desulfosporosinus lacus sp. nov., a sulfate-reducing bacterium isolated from pristine freshwater lake sediments
A novel sulfate-reducing bacterium was isolated from pristine sediments of Lake Stechlin, Germany. This strain, STP12 , was found to contain predominantly c-type cytochromes and to reduce sulfate, sulfite and thiosulfate using lactate as an electron donor. Although STP12 could not utilize elemental sulfur as an electron acceptor, it could support growth by dissimilatory Fe(III) reduction. In a comparison of 16S rRNA gene sequences, STP12 was 96.7 % similar to Desulfosporosinus auripigmenti DSM 13351 , 96.5 % similar to Desulfosporosinus meridiei DSM 13257 and 96.4 % similar to Desulfosporosinus orientis DSM 765 . DNA-DNA hybridization experiments revealed that strain STP12 shows only 32 % reassociation with the type strain of the type species of the genus, D. orientis DSM 765 . These data, considered in conjunction with strain-specific differences in heavy metal tolerance, cell-wall chemotaxonomy and riboprint patterns, support recognition of strain STP12 (=DSM 15449 =JCM 12239 ) as the type strain of a distinct and novel species within the genus Desulfosporosinus, Desulfosporosinus lacus sp. nov. © 2006 IUMS. T T T T T T T T T T
Ferromagnetic Enhancement of CE-type Spin Ordering in (Pr,Ca)MnO
We present resonant soft X-ray scattering (RSXS) results from small band
width manganites (Pr,Ca)MnO, which show that the CE-type spin ordering (SO)
at the phase boundary is stabilized only below the canted antiferromagnetic
transition temperature and enhanced by ferromagnetism in the macroscopically
insulating state (FM-I). Our results reveal the fragility of the CE-type
ordering that underpins the colossal magnetoresistance (CMR) effect in this
system, as well as an unexpected cooperative interplay between FM-I and CE-type
SO which is in contrast to the competitive interplay between the ferromagnetic
metallic (FM-M) state and CE-type ordering.Comment: Accepted for publication in Phys. Rev. Let
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