Spin fluctuations in hydrogen-stabilized Laves phase UTi<sub>2</sub>H<sub>5</sub>

Buturlim, V.; Falkowski, M.; Paukov, M.; Koloskova, Oleksandra; Drozdenko, Daria; Dopita, Milan; Minárik, Peter; Mašková, S.; Doležal, Petr; Havela, L.

doi:10.1080/14786435.2019.1605222

Cited by 3 publications

(2 citation statements)

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“…This cubic Laves-phase hydride reveals unusual low-temperature physical properties. It was classified as spin fluctuator analogous to UAl 2 , but with a higher -enhancement, and the spin-fluctuation temperature T SF = 10-15 K [8]. In this article we extend the knowledge of the electron-transport properties of U-Ti alloys which exhibit the bcc structure.…”

Section: Introductionmentioning

confidence: 80%

Anomalous Superconductivity of the U-Ti Alloys

Buturlim

Koloskova

Minárik

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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bcc U-Ti alloys represent type-II superconductors with transition temperatures exceeding 1 K. The highest temperature was observed for the alloy with 80 at.% of Ti (T c = 3.74 K). Diluted by Ti, U does not possess magnetic moments and all alloys are weak paramagnets. However, specific heat and resistivity measurements in various magnetic fields indicate very high upper critical field  0 H c2 =16.4 ±0.2 T.

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Section: Introductionmentioning

confidence: 80%

Anomalous Superconductivity of the U-Ti Alloys

Buturlim

Koloskova

Minárik

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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“…Interesting variations of magnetic properties can be obtained when changing the H concentration, possible between UTi 2 H 5 and UTi 2 H 6 , giving the respective lattice parameter a = 884.8 pm and 885.8 pm. While UTi 2 H 6 is a ferromagnet with T C = 54 K [158], UTi 2 H 5 is a spin fluctuator close to the verge of magnetic ordering, indicated by the lack of magnetic order and very high γ = 256 mJ mol −1 K −2 , which classifies the hydride as a mid-weight heavy fermion [159]. Although the U-U spacing of 367.5 pm, exceeding the Hill limit 340-360 pm [1], can be sufficient for stabilization of U magnetic moments and their ordering, the Ti 3d states located roughly at the same energy as the 5f states tend to destabilize them by the 5f -3d hybridization.…”

Section: Binary Actinide Intermetallicsmentioning

confidence: 99%

Hydrogen in actinides: electronic and lattice properties

Havela

Legut

Kolorenč³

2023

Rep. Prog. Phys.

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Hydrides of actinides, their magnetic, electronic, transport, and thermodynamic properties are discussed within a general framework of H impact on bonding, characterized by volume expansion, affecting mainly the 5f states, and a charge transfer towards H, which influences mostly the 6d and 7s states. These general mechanisms have diverse impact on individual actinides, depending on the degree of localization of their 5f states. Hydrogenation of uranium yields UH2 and UH3, binary hydrides that are strongly magnetic due to a 5f band narrowing and reduction of the 5f‐6d hybridization. Pu hydrides become magnetic as well, mainly as a result of the stabilization of the magnetic 5f 5 state and elimination of the admixture of the non‐magnetic 5f 6 component. Ab‐initio computational analyses, which for example suggest that the ferromagnetism of β‐UH3 is rather intricate involving two non‐collinear sublattices, are corroborated by spectroscopic studies of sputter‐deposited thin films, yielding a clean surface and offering a variability of compositions. It is found that valence‐band photoelectron spectra cannot be compared directly with the 5f n ground‐state density of states. Being affected by electron correlations in the excited final states, they rather reflect the atomic (n‐1) multiplets. Similar tendencies can be identified also in hydrides of binary and ternary intermetallic compounds. H absorption can be used as a tool for fine tuning of electronic structure around a quantum critical point. A new direction is represented by actinide polyhydrides with a potential for high‐temperature superconductivity.

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