The magnetic excitations in Ce(Cu,Al)(4) solid solutions-An analysis of heat capacity and the role of atomic disorder

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10378830" target="_blank" >RIV/00216208:11320/18:10378830 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.intermet.2018.04.014" target="_blank" >https://doi.org/10.1016/j.intermet.2018.04.014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.intermet.2018.04.014" target="_blank" >10.1016/j.intermet.2018.04.014</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The magnetic excitations in Ce(Cu,Al)(4) solid solutions-An analysis of heat capacity and the role of atomic disorder

Popis výsledku v původním jazyce

The tetragonal CeCuxAl4-x solid solutions show unusual inelastic neutron spectra containing additional excitations that cannot be explained by a standard crystalline electric field model assuming a single Ce trivalent ion. This observation was ascribed to a strong magnetoelastic coupling which leads to a formation of the vibron quasibound state. In this work, we present analysis of the specific heat data of CeCuxAl4-x (x ranging from 0.75 to 1.1) compounds. We show that the magnetic contribution in the paramagnetic region cannot be fitted within the standard crystalline electric field model using a single set of energy levels, in agreement with neutron scattering results. To describe the specific heat data, we introduce a model which assumes at least two different local surroundings of the cerium ions in the sample. It can serve as complementary or alternative view on the unusual excitation spectrum of this system and allows us to describe behavior of Ce(Cu,Al)(4) compounds without introducing a vibron model. The analysis is confronted with previous structural studies and results of neutron scattering experiments.

Název v anglickém jazyce

The magnetic excitations in Ce(Cu,Al)(4) solid solutions-An analysis of heat capacity and the role of atomic disorder

Popis výsledku anglicky

The tetragonal CeCuxAl4-x solid solutions show unusual inelastic neutron spectra containing additional excitations that cannot be explained by a standard crystalline electric field model assuming a single Ce trivalent ion. This observation was ascribed to a strong magnetoelastic coupling which leads to a formation of the vibron quasibound state. In this work, we present analysis of the specific heat data of CeCuxAl4-x (x ranging from 0.75 to 1.1) compounds. We show that the magnetic contribution in the paramagnetic region cannot be fitted within the standard crystalline electric field model using a single set of energy levels, in agreement with neutron scattering results. To describe the specific heat data, we introduce a model which assumes at least two different local surroundings of the cerium ions in the sample. It can serve as complementary or alternative view on the unusual excitation spectrum of this system and allows us to describe behavior of Ce(Cu,Al)(4) compounds without introducing a vibron model. The analysis is confronted with previous structural studies and results of neutron scattering experiments.

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

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)

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Intermetallics

ISSN

0966-9795

e-ISSN

—

Svazek periodika

100

Číslo periodika v rámci svazku

září

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

52-56

Kód UT WoS článku

000440119100007

EID výsledku v databázi Scopus

2-s2.0-85048074541