We have grown a series of nickel substituted single crystals of the layered ferromagnet (FM) Fe3GeTe2. The large single crystalline samples of (Fe1−xNix)3GeTe2 with x = 0 − 0.84 were characterized with single crystal X-ray diffraction, magnetic susceptibility, electrical resistance and muon spin spectroscopy. We find Fe can be continuously substituted with Ni with only minor structural variation. In addition, FM order is suppressed from TC = 212 K for x = 0 down to TC = 50 K for x = 0.3, which is accompanied with a strong suppression of saturated and effective moment, and Curie-Weiss temperature. Beyond x = 0.3, the FM order is continuously smeared into a FM cluster glass phase, with a nearly full magnetic volume fraction. We attribute the observed change in the nature of magnetic order to the intrinsically disordered structure of Fe3GeTe2 and subsequent dilution effects from the Ni substitution. arXiv:1809.03429v2 [cond-mat.str-el]

ZrMnP and HfMnP single crystals are grown by a self-flux growth technique and structural as well as temperature dependent magnetic and transport properties are studied. Both compounds have an orthorhombic crystal structure. ZrMnP and HfMnP are ferromagnetic with Curie temperatures around 370 K and 320 K respectively. The spontaneous magnetizations of ZrMnP and HfMnP are determined to be 1.9 µ B /f.u. and 2.1 µ B /f.u. respectively at 50 K. The magnetocaloric effect of ZrMnP in term of entropy change (∆S) is estimated to be −6.7 kJm −3 K −1 around 369 K. The easy axis of magnetization is [100] for both compounds, with a small anisotropy relative to the [010] axis. At 50 K, the anisotropy field along the [001] axis is ∼ 4.6 T for ZrMnP and ∼ 10 T for HfMnP. Such large magnetic anisotropy is remarkable considering the absence of rare-earth elements in these compounds. The first principle calculation correctly predicts the magnetization and hard axis orientation for both compounds, and predicts the experimental HfMnP anisotropy field within 25 percent. More importantly, our calculations suggest that the large magnetic anisotropy comes primarily from the Mn atoms suggesting that similarly large anisotropies may be found in other 3d transition metal compounds.In recent years, both the increase in the price of rare-earths used in magnets and adverse environmental impacts associated with their mining and purification have made the search for rare-earth-poor or rareearth-free permanent magnets crucial. In an attempt to look for potential rare-earth-free alternatives, we studied the magnetocrystalline anisotropy of the Fe-rich compounds (Fe 1−x Co x ) 2 B 1 and Fe 5 B 2 P. 2 Specifically, (Fe 0.7 Co 0.3 ) 2 B has drawn a lot of attention as a possible permanent magnet because of its axial magnetocrystalline anisotropy.3-5 Fe 5 B 2 P has a comparable magnetocrystalline anisotropy. 2Mn, like Fe, offers some of the highest ordered moment values, but finding Mn-based ferromagnets is challenging. Fortunately Mn is known to form ferromagnetic phases such as MnX, where X is a pnictogen. Recently MnBi, both in pure form and in a high temperature phase, stabilized with Rh, 6-9 has been studied as a possible Mn-based ferromagnet with moderate magnetic anisotropy.Given the existence of Mn-X ferromagnetism and our recent efforts to discover ternary ferromagnets through the surveys of transition metal -pnictogen and chalcogen ternary compounds, we used the Mn-rich, Mn-P eutectic as a starting point for a search for Mn-P-X ternary ferromagnets. During our survey

Free standing, low strain, single crystals of pure and titanium doped VO 2 were grown out of an excess of V 2 O 5 using high temperature solution growth techniques. At T M I ∼ 340 K, pure VO 2 exhibits a clear first-order phase transition from a high-temperature paramagnetic tetragonal phase (R) to a low-temperature non-magnetic monoclinic phase (M1). With Ti doping, another monoclinic phase (M2) emerges between the R and M1 phases. The phase transition temperature between R and M2 increases with increasing Ti doping while the transition temperature between M2 and M1 decreases.

The microscopic details of the suppression of antiferromagnetic order in the Kondo-lattice series Ce1−xLaxCu2Ge2 due to nonmagnetic dilution by La are revealed through neutron diffraction results for x = 0.20, 0.40, 0.75, and 0.85. Magnetic Bragg peaks are found for 0.20 ≤ x ≤ 0.75, and both the Néel temperature, TN, and the ordered magnetic moment per Ce, µ, linearly decrease with increasing x. The reduction in µ points to strong hybridization of the increasingly diluted Ce 4f electrons, and we find a remarkable quadratic dependence of µ on the Kondo-coherence temperature. We discuss our results in terms of local-moment-versus itinerant-type magnetism and mean-field theory, and show that Ce1−xLaxCu2Ge2 provides an exceptional opportunity to quantitatively study the multiple magnetic interactions in a Kondo lattice.