Magnetotransport in Sr3PbO antiperovskite with three-dimensional massive Dirac electrons

Novel topological phenomena are anticipated for three-dimensional (3D) Dirac electrons. The magnetotransport properties of cubic ${\rm Sr_{3}PbO}$ antiperovskite, theoretically proposed to be a 3D massive Dirac electron system, are studied. The measurements of Shubnikov-de Haas oscillations and Hall resistivity indicate the presence of a low density ($\sim 1 \times 10^{18}$ ${\rm cm^{-3}}$) of holes with an extremely small cyclotron mass of 0.01-0.06$m_{e}$. The magnetoresistance $\Delta\rho_{xx}(B)$ is linear in magnetic field $B$ with the magnitude independent of temperature. These results are fully consistent with the presence of 3D massive Dirac electrons in ${\rm Sr_{3}PbO}$. The chemical flexibility of the antiperovskites and our findings in the family member, ${\rm Sr_{3}PbO}$, point to their potential as a model system in which to explore exotic topological phases

Improving preparation for pharmacy entry-to-practice OSCE using a participatory action research.

In Switzerland, becoming a licensed pharmacist requires succeeding a federal entry-to-practice exam that includes an Objective Structured Clinical Examination (OSCE). Candidates from the University of Geneva (UNIGE) exhibited a higher failure rate in this part of the examination in comparison to candidates from other Swiss institutions. The institution made a specific set of pedagogical changes to a 3-week pharmacy services course that is run during their Master's second year to prepare them for their entry-to-practice OSCE. One key change was a switch from a summative in-classroom OSCE to an on-line formative OSCE. New teaching activities were introduced between 2019 2020 and 2021-2022 academic years to help students strengthen their patient-facing skills and prepare for the federal OSCE. These online activities consisted in formative OSCEs supplemented with group and individual debriefings and in 18 h clinical case simulations reproducing OSCE requirements and assessed with standardized evaluation grids. Failure rates before and after the introduction of these activities were compared, and their perceived usefulness by UNIGE candidates was collected through a questionnaire survey. The UNIGE failure rate decreased from 6.8% in 2018/2019 to 3.3% in 2022 following the implementation of the new teaching activities. The difference in failure rates between UNIGE and the other institutions became less pronounced in 2022 compared to 2018/2019. The redesigned Master's course was highlighted as useful for preparation, with all new activities perceived as beneficial. Questionnaire responses brought attention to challenges faced by UNIGE candidates, including stress management, insufficient information or practical training, and experiences related to quarantine. These insights informed further development of teaching methods. Although the results do not establish a direct link between participation in new teaching activities and increased performance, they suggest resolving the initial issue. Our findings relate to pedagogical concepts such as constructive alignment, formative assessment and examination anxiety, and generally support the benefits of online format. This study used a participatory action research based on mixed methods to address a challenge in pharmacy education. Online teaching activities including formative OSCEs, case simulations and debriefings were implemented. Improved performance in entry-to-practice OSCE was subsequently observed. The results highlight the potential of formative, active, and constructively aligned online activities, such as role-playing and case simulation, to enhance patient-facing skills and improve outcomes in summative assessments of these skills

Exotic magnetism in the alkali sesquoxides Rb4O6 and Cs4O6

Among the various alkali oxides the sesquioxides Rb4O6 and Cs4O6 are of special interest. Electronic structure calculations using the local spin-density approximation predicted that Rb4O6 should be a half-metallic ferromagnet, which was later contradicted when an experimental investigation of the temperature dependent magnetization of Rb4O6 showed a low-temperature magnetic transition and differences between zero-field-cooled (ZFC) and field-cooled (FC) measurements. Such behavior is known from spin glasses and frustrated systems. Rb4O6 and Cs4O6 comprise two different types of dioxygen anions, the hyperoxide and the peroxide anions. The nonmagnetic peroxide anions do not contain unpaired electrons while the hyperoxide anions contain unpaired electrons in antibonding pi*-orbitals. High electron localization (narrow bands) suggests that electronic correlations are of major importance in these open shell p-electron systems. Correlations and charge ordering due to the mixed valency render p-electron-based anionogenic magnetic order possible in the sesquioxides. In this work we present an experimental comparison of Rb4O6 and the related Cs4O6. The crystal structures are verified using powder x-ray diffraction. The mixed valency of both compounds is confirmed using Raman spectroscopy, and time-dependent magnetization experiments indicate that both compounds show magnetic frustration, a feature only previously known from d- and f-electron systems

Status of the emittance transfer experiment emtex

In order to improve the injection efficiency of the round UNILAC heavy ion beam into the asymmetric acceptance of the SIS18 it would be of great advantage to decreasethe horizontal emittance by a so called emittance transferto the vertical plane. In this contribution the present statusof the emittance transfer experiment EMTEX at GSI will be reported. A short introduction about the theoretical background of the technique will be given, while the mainpart is dedicated to the practical solutions setting up a testbeam line at GSI. Finally, the results of a first commissioning beam time will be presented. The scheduled beam time to apply the emittance transfer technique foreseen in spring 2014 had to be shifted to calendar week 26 in 2014, just after this conference as some components have not been delivered in time by the contractor. The results and comparison to the theoretical predictions you may find in later publications