Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationSpin-zero anomaly in the magnetic quantum oscillations of a two-dimensional metal
Bergk, B.; Ignatchik, O.; Jäckel, M.; Wosnitza, J.; Gvozdikov, V. M.; Schlueter, J. A.; Mohtasham, J.; Winter, R. W.; Gard, G. L.
Abstract
We present de Haas van Alphen (dHvA) and Shubnikov-de Haas (SdH) measurements on the quasi-two-dimensional organic superconductor 00- (BEDT-TTF)2SF5CH2CF2SO3. The measurements were carried out by the torque method and by four-point low-frequency ac-resistance measurements in magnetic fields up to 15 T. Unlike theoretical expectations for two-dimensional metals the dHvA signal shows an unconventional sawtooth wave-form, i. e., an inversed sawtooth wave form is observed. In order to investigate the behaviour in more detail we performed angledependent dHvA and SdH measurements. The SdH effect displays the behaviour predicted by the grand-canonical Lifshitz-Kosevich theorie. In contrast, the dHvA signal can be explained by a theory, which includes a slightly oscillating chemical potential. Even for simultaneous measurements of both effects the behaviour does not change. This means that the dHvA signal is not affected by an external charge carrier reservoir.
-
Poster
Frühjahrstagung der DPG, 27.-31.03.2006, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-9173
Years: 2023 2022 2021 2020 2019 2018 2017 2016 2015