Biomedical subjects

E Schierle

Publications and source records attributed to E Schierle.

3 recordsLinked to original sources

PubMed2005

Spectroscopy of stripe order in La1.8Sr0.2NiO4 using resonant soft x-ray diffraction.

Strong resonant enhancements of the charge-order and spin-order superstructure-diffraction intensities in La1.8Sr0.2NiO4 are observed when x-ray energies in the vicinity of the Ni L2,3 absorption edges are used. The pronounced photon-energy and polarization dependences of these diffraction intensities allow for a critical determination of the local symmetry of the ordered spin and charge carriers. We found that not only the antiferromagnetic order but also the charge-order superstructure resides within the NiO2 layers; the holes are mainly located on in-plane oxygens surrounding a Ni2+ site with the spins coupled antiparallel in close analogy to Zhang-Rice singlets in the cuprates.

Journal Article↗

PubMed2004

Finite-size effect on magnetic ordering temperatures in long-period antiferromagnets: holmium thin films.

The thickness dependence of the helical antiferromagnetic ordering temperature T(N) was studied for thin Ho metal films by resonant magnetic soft x-ray and neutron diffraction. In contrast with the Curie temperature of ferromagnets, T(N) was found to decrease with film thickness d according to [T(N)(infinity)-T(N)(d)]/T(N)(d) proportional variant (d-d(0))(-lambda(')), where lambda(') is a phenomenological exponent and d(0) is of the order of the bulk magnetic period L(b). These observations are reproduced by mean-field calculations that suggest a linear relationship between d(0) and L(b) in long-period antiferromagnets.

Journal Article↗

PubMed1980

[Acid etching technic in the mixed dentition].

Clinical experience with defect and filling therapy has been good, even with deciduous teeth, a form of therapy which has not been considered promising because of the "prismless enamel of deciduous teeth". Examination with the scanning electron microscope supported our positive findings. If the aforementioned surface layer is removed mechanically prior to treatment with etching agents, the same retentive etching pattern could be obtained as was found on the remaining teeth. The best results were obtained with a 37% solution of phosphoric acid.

Acid Etching, Dental↗