Pressure variations of the 5f magnetism in UH3
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10402231" target="_blank" >RIV/00216208:11320/20:10402231 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/61989100:27740/20:10244877
Výsledek na webu
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=i5vPV1ZHnH" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=i5vPV1ZHnH</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jmmm.2019.165993" target="_blank" >10.1016/j.jmmm.2019.165993</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Pressure variations of the 5f magnetism in UH3
Popis výsledku v původním jazyce
Pressure variations of the Curie temperature of the 5f ferromagnet beta-UH3 were studied using the Mo-alloyed hydride (UH3)(0.)Mo-82(0).18, which is stable in air and has very similar T-C and magnetization per U atom. By means of ac magnetic susceptibility a linear decrease of T-C was observed for pressures up to 3.2 GPa. The coefficient dT(C)/dp = -2.05 K/GPa gives dlnT(C)/dp = 1/T*dT(C)/dp approximate to -0.011 GPa(-1). This value is smaller than expected for a 5f-band ferromagnet with relatively short U-U distances and suggests that UH3 may be more localized than expected. Among AnX compounds, similar dependence was found e.g. for US. Revisiting existing data on lattice elasticity for beta-UH3, bulk modulus B approximate to 100 GPa can be assumed, leading to dlnT(C)/dlnV = 1.1. Experimental data are confronted with results of GGA + U electronic structure calculations. Plausible values of direct Coulomb U and Hund's exchange J are deduced. The lattice compression was found to reduce predominantly the orbital moments.
Název v anglickém jazyce
Pressure variations of the 5f magnetism in UH3
Popis výsledku anglicky
Pressure variations of the Curie temperature of the 5f ferromagnet beta-UH3 were studied using the Mo-alloyed hydride (UH3)(0.)Mo-82(0).18, which is stable in air and has very similar T-C and magnetization per U atom. By means of ac magnetic susceptibility a linear decrease of T-C was observed for pressures up to 3.2 GPa. The coefficient dT(C)/dp = -2.05 K/GPa gives dlnT(C)/dp = 1/T*dT(C)/dp approximate to -0.011 GPa(-1). This value is smaller than expected for a 5f-band ferromagnet with relatively short U-U distances and suggests that UH3 may be more localized than expected. Among AnX compounds, similar dependence was found e.g. for US. Revisiting existing data on lattice elasticity for beta-UH3, bulk modulus B approximate to 100 GPa can be assumed, leading to dlnT(C)/dlnV = 1.1. Experimental data are confronted with results of GGA + U electronic structure calculations. Plausible values of direct Coulomb U and Hund's exchange J are deduced. The lattice compression was found to reduce predominantly the orbital moments.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2020
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Journal of Magnetism and Magnetic Materials
ISSN
0304-8853
e-ISSN
—
Svazek periodika
497
Číslo periodika v rámci svazku
březen
Stát vydavatele periodika
NL - Nizozemsko
Počet stran výsledku
6
Strana od-do
165993
Kód UT WoS článku
000501596800069
EID výsledku v databázi Scopus
—