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Keywords = Kondo-like scattering

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15 pages, 777 KB  
Article
Kondo-like Behavior in Lightly Gd-Doped Manganite CaMnO3
by Tomislav Ivek, Matija Čulo, Nikolina Novosel, Maria Čebela, Bojana Laban, Uroš Čakar and Milena Rosić
Nanomaterials 2025, 15(11), 784; https://doi.org/10.3390/nano15110784 - 23 May 2025
Cited by 2 | Viewed by 1231
Abstract
Manganese oxides (manganites) are among the most studied materials in condensed matter physics due to the famous colossal magnetoresistance and very rich phase diagrams characterized by strong competition between ferromagnetic (FM) metallic and antiferromagnetic (AFM) insulating phases. One of the key questions that [...] Read more.
Manganese oxides (manganites) are among the most studied materials in condensed matter physics due to the famous colossal magnetoresistance and very rich phase diagrams characterized by strong competition between ferromagnetic (FM) metallic and antiferromagnetic (AFM) insulating phases. One of the key questions that remains open even after more than thirty years of intensive research is the exact conductivity mechanism in insulating as well as in metallic phases and its relation to the corresponding magnetic structure. In order to shed more light on this problem, here, we report magnetotransport measurements on sintered nanocrystalline samples of the very poorly explored manganites Ca1xGdxMnO3 with x=0.05 and x=0.10, in the temperature range 2–300 K, and in magnetic fields up to 16 T. Our results indicate that both compounds at low temperatures exhibit metallic behavior with a peculiar resistivity upturn and a large negative magnetoresistance. We argue that such behavior is consistent with a Kondo-like scattering on Gd impurities coupled with the percolation of FM metallic regions within insulating AFM matrix. Full article
(This article belongs to the Topic Magnetic Nanoparticles and Thin Films)
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17 pages, 4451 KB  
Article
Laves Phase Formation in High Entropy Alloys
by Roman Ryltsev, Vasiliy Gaviko, Svetlana Estemirova, Evgenii Sterkhov, Lubov Cherepanova, Denis Yagodin, Nikolay Chtchelkatchev, Nikolay Dubinin and Sergey Uporov
Metals 2021, 11(12), 1962; https://doi.org/10.3390/met11121962 - 6 Dec 2021
Cited by 20 | Viewed by 7149
Abstract
One of the intriguing recent results in the field of high-entropy alloys is the discovery of single-phase equiatomic multi-component Laves intermetallics. However, there is no clear understanding that a combination of chemical elements will form such high-entropy compounds. Here we contribute to understanding [...] Read more.
One of the intriguing recent results in the field of high-entropy alloys is the discovery of single-phase equiatomic multi-component Laves intermetallics. However, there is no clear understanding that a combination of chemical elements will form such high-entropy compounds. Here we contribute to understanding this issue by modifying the composition of duodenary TiZrHfNbVCrMoMnFeCoNiAl (12x) alloy in which we recently reported the fabrication of hexagonal C14 Laves phase. We consider three alloys based on 12x: 7x = 12x-VCrMoMnFe, 12x + Sc, 12x + Be and observe that all of them crystalize with the formation of C14 Laves phase as a dominant structure. We report that 12x + Be alloy reveals a single-phase C14 structure with a very high concentration of structural defects and ultra-fine dendritic microstructure with an almost homogenous distribution of the constituted elements over the alloy matrix. The analysis of electrical and magnetic properties reveals that the Laves phases are Curie-Weiss paramagnets, which demonstrate metallic conduction; 7x and 12x alloys also reveal a pronounced Kondo-like anomaly. Analysis of experimental data as well as ab initio calculations suggest that chemical complexity and compositional disorder cause strong s-d band scattering and thus the rather high density of d-states in the conduction band. Full article
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