Electronic properties of Pu19Os simulating beta-Pu: the strongly correlated Pu phase

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10374586" target="_blank" >RIV/00216208:11320/18:10374586 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/18:00498389

Výsledek na webu

<a href="https://doi.org/10.1088/1361-648X/aaa520" target="_blank" >https://doi.org/10.1088/1361-648X/aaa520</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-648X/aaa520" target="_blank" >10.1088/1361-648X/aaa520</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electronic properties of Pu19Os simulating beta-Pu: the strongly correlated Pu phase

Popis výsledku v původním jazyce

We established the basic electronic properties of zeta-Pu19Os, which is a close analogue to beta-Pu, and its low-temperature variety, eta-Pu19Os. Their magnetic susceptibility is 15% higher than for delta-Pu. A specific heat study of zeta-Pu19Os shows a soft lattice similar to delta-Pu, leading to a low Debye temperature Theta(D) = 101 K. The linear electronic coefficient gamma related to the quasiparticle density of states at the Fermi level points to a higher value, 55 +/- 2 mJ (mol Pu K-2)(-1), compared to 40 mJ (mol K-2)(-1) for delta-Pu. The results confirm that beta-Pu is probably the most strongly correlated Pu phase, as had been indicated by resistivity measurements. The volume and related Pu-Pu spacing is clearly not the primary tuning parameter for Pu metal, as the beta-Pu density stands close to the ground-state alpha-phase and is much higher than that for delta-Pu. The eta-Pu19Os phase has a record gamma-value of 74 +/- 2 mJ (mol Pu K-2)(-1). The enhancement is not reproduced by LDA+DMFT calculations in the fcc structure, which suggests that multiple diverse sites can be the key to the understanding of beta-Pu.

Název v anglickém jazyce

Electronic properties of Pu19Os simulating beta-Pu: the strongly correlated Pu phase

Popis výsledku anglicky

We established the basic electronic properties of zeta-Pu19Os, which is a close analogue to beta-Pu, and its low-temperature variety, eta-Pu19Os. Their magnetic susceptibility is 15% higher than for delta-Pu. A specific heat study of zeta-Pu19Os shows a soft lattice similar to delta-Pu, leading to a low Debye temperature Theta(D) = 101 K. The linear electronic coefficient gamma related to the quasiparticle density of states at the Fermi level points to a higher value, 55 +/- 2 mJ (mol Pu K-2)(-1), compared to 40 mJ (mol K-2)(-1) for delta-Pu. The results confirm that beta-Pu is probably the most strongly correlated Pu phase, as had been indicated by resistivity measurements. The volume and related Pu-Pu spacing is clearly not the primary tuning parameter for Pu metal, as the beta-Pu density stands close to the ground-state alpha-phase and is much higher than that for delta-Pu. The eta-Pu19Os phase has a record gamma-value of 74 +/- 2 mJ (mol Pu K-2)(-1). The enhancement is not reproduced by LDA+DMFT calculations in the fcc structure, which suggests that multiple diverse sites can be the key to the understanding of beta-Pu.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/GA15-01100S" target="_blank" >GA15-01100S: 5f magnetismus v hydridech na bázi slitin gama-U</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physics Condensed Matter

ISSN

0953-8984

e-ISSN

—

Svazek periodika

30

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

—

Kód UT WoS článku

000424018100001

EID výsledku v databázi Scopus

2-s2.0-85041928782