Browsing by Affiliation "Crystallography/Mineralogy"
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- Research DataGrowth-Controlled Twinning and Magnetic Anisotropy in CeSb22025-11-14Cerium diantimonide (CeSb2) is a layered heavy-fermion Kondo lattice material that hosts complex magnetism and pressure-induced superconductivity. The interpretation of its in-plane anisotropy has remained unsettled due to structural twinning, which superimposes orthogonal magnetic responses. Here we combine controlled crystal growth with magnetization and rotational magnetometry to disentangle the effects of twinning. Nearly untwinned high-quality single crystals reveal the intrinsic in-plane anisotropy: the in-plane easy axis saturates at M_easy(4 T) ≈ 1.8 µ_B/Ce, while the in-plane hard axis magnetization is strongly suppressed, nearly linear, and comparable to the out-of-plane response. These results resolve long-standing discrepancies in reported magnetic measurements, in which in-plane metamagnetic transition fields and saturation magnetization varied significantly across previous studies. Growth experiments demonstrate that avoiding the proposed α-β structural transition - through Sb-rich flux and slower cooling - systematically reduces twinning. However, powder X-ray diffraction and differential thermal analysis measurements show no clear evidence of a distinct β phase. Our results establish a consistent magnetic phase diagram and provide essential constraints for crystal-electric field models, enabling a clearer understanding of the interplay between anisotropic magnetism and unconventional superconductivity in CeSb2.
5 30 - Research DataIsothermal Compressibility and Isobaric Thermal Expansion of Liquid trans-1,2-Dichloroethene at Low Temperatures2024-03-27This dataset includes the experimental data on the density of the trans-1,2-dichloroethene. Thermal expansion and isothermal compressibility of this material were measured in the pressure range of 1—150 bar and temperature range from -26 to +6 °C. X-ray radiography set-up HECTOR at Ghent University was used for these measurements.
105 12 - Research DataMagnetic frustration and weak Mn magnetic ordering in EuMn2P22025-04-10We report on the electron spin resonance (ESR), heat capacity, magnetization, nuclear magnetic resonance (NMR), magnetic circular and linear dichroism (XMCD, XMLD), as well as the electrical resistivity of EuMn2P2 single crystals. Antiferromagnetic order of Eu was observed in several quanti- ties at T Eu N = 18 K. The temperature dependencies of ESR linewidth and resonance shift show, when approaching the Eu-ordered state, a divergence towards T Eu N , indicating the growing importance of magnetic correlations and the build-up of internal magnetic fields. An additional temperature scale of ≈ 47 K has considerable impact on linewidth, resonance field and intensity. This points to the presence of weak Mn-based ordering. The observed ESR line is interpreted as an Eu2+ resonance, which probes the weak magnetic background of the Mn subsystem. Such picture is suggested by the lineshape which keeps to be Lorentzian across the 47 K scale and by the ESR intensity which can be described by the same Curie-Weiss temperature above and below 47 K. In the same temperature range anomalies were observed at 48.5 K and 51 K in the heat capacity data as well as a pronounced broadening of the NMR signal of the EuMn2P2 samples. In XMCD and XMLD measurements, this weak magnetic order could not be detected in the same temperature range which might be due to the small magnetic moment, with a potential c-component or frustration.
64 2 - Research DataRadiographic Density and Viscosity Measurements of Sulfur2024-11-07Merges, David (DataCollector)Varentsov, Dmitry (DataCollector)Schanz, Martin (DataCollector)Weyrich, Karin (DataCollector)Mariam, Fesseha (DataCollector)Gavrilin, Roman (DataCollector)Skobliakov, Alexei (DataCollector)Khurchiev, Aiush (DataCollector)Nikolaev, Dmitry (DataCollector)Josipovic, Iván (DataCollector)Müller-Münster, Alexander (DataCollector)Schröer, Laurenz (DataCollector)Cnudde, Veerle (Supervisor)Winkler, Bjoern (Supervisor)This dataset includes the data for liquid sulfur density and viscosity. Both properties were measured at the constant pressure of 90 bar, the pressure of the atmosphere of Venus at its surface. A proton microscope at GSI (PRIOR-II) and an X-ray radiography setup at Ghent University (HECTOR) were used for these measurements.
51 14 - Research DataTowards a critical endpoint in the valence fluctuating Eu(Rh1-xCox)2Si2 system2025-10-15Caroca-Canales, NubiaKraiker, AlexejSeiro, Silvia S.Geibel, ChristophWe report on the successful single crystal growth of pure EuRh${_2}$Si${_2}$ and of Eu(Rh$_{1-x}$Co$_{x}$)$_2$Si$_2$ with $x\leq0.23$ by the flux method. Through Co substitution, EuRh$_2$Si$_2$ can be tuned from stable antiferromagnetism via a valence-transition state towards the valence-crossover regime. From magnetization measurements, we constructed a $B - T$ phase diagram for EuRh${_2}$Si${_2}$ comprising multiple magnetic phases and showing a sizable magnetic anisotropy within the basal plane of the tetragonal unit cell. This indicates a complex antiferromagnetic ground state for $x=0$. By applying positive chemical pressure through the substitution series Eu(Rh$_{1-x}$Co$_{x}$)$_2$Si$_2$, a sharp temperature-induced first-order phase transition is observed in magnetization, resistivity and heat capacity for \textcolor{blue}{0.081 $\leq$ $x$ $\leq$ 0.126}. The critical end point of this valence transition is located in the phase diagram in the vicinity of \textcolor{blue}{0.126 $
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