Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Superconductivity: Properties, Electronic Structure, Order Parameter
TT 62.6: Vortrag
Donnerstag, 14. März 2013, 16:45–17:00, H19
Magnetic and Superconducting Phases in RE-doped Chrysene — •Franziska Hammerath, Pietro Carretta, Gianluca A. Artioli, and Lorenzo Malavasi — University of Pavia - CNISM, 27100 Pavia, Italy
We present the first magnetic susceptibility, nuclear magnetic resonance (NMR) and muon spin rotation (µSR) investigations of rare earth (RE) doped Chrysene, (RE = Sm, Eu and La),
a promising candidate for a new superconducting (SC) hydrocarbon material.
The magnetic susceptibility of pure Chrysene is only weakly temperature dependent, its zero-field µSR measurements indicate a high fraction of Muonium formation and its 1H-NMR spectra and relaxation rates are determined by the dominant nuclear dipolar interactions. The NMR, µSR and susceptibility measurements on the RE-doped compounds show different behaviors, thus confirming the formation of REChrysene phases.
Indications of superconductivity are present in La- and Sm-doped Chrysene with SC transition temperatures of 6 K and 4-7 K, respectively.
While LaChrysene exhibits a rather high SC volume fraction (≈ 30 %), the one of SmChrysene is always very small. The pressure and magnetic field dependence of Tc of LaChrysene is very similar to the one of LaPhenanthrene [1], but has to be discussed in the context of a possible spurious fcc La phase, which shows similar SC properties. Such an effect can be excluded for SmChrysene.
Susceptibility, NMR and µSR measurements on EuChrysene on the other hand evidence the onset of a magnetic order involving Eu ions.
[1] X. F. Wang et al., J. Phys. Condens. Matter 24, 345701 (2012)