Relaxation phenomena and magnetocaloric effect in the dynamic spin ice Pr2Sn2O7

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10398885" target="_blank" >RIV/00216208:11320/19:10398885 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Am2JoPr9aq" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Am2JoPr9aq</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jallcom.2019.151719" target="_blank" >10.1016/j.jallcom.2019.151719</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Relaxation phenomena and magnetocaloric effect in the dynamic spin ice Pr2Sn2O7

Popis výsledku v původním jazyce

Spin relaxation and a magnetocaloric effect in a dipolar spin ice Pr2Sn2O7 were investigated by magnetization and alternating susceptibility measurements in Kelvin temperature range and magnetic fields exceeding the estimated value of the saturation field B-sat. An analysis of AC susceptibility revealed existence of two relaxation channels. The calculation of energy spectrum of a single tetrahedron suggests that a fast temperature independent relaxation may be associated with a cross-tunneling process, in which four spins in one tetrahedron are involved. In contrast, a slow relaxation is attributed to a phonon-bottleneck effect. A particle-size analysis identifies a phonon scattering in grain boundaries as a governing mechanism of the phonon bottleneck. Systematic measurements of the magnetization were performed to study magnetocaloric effect in Pr2Sn2O7. A complex analysis of the isothermal change of magnetic entropy Delta S-m revealed a dominating effect of magnetocrystalline anisotropy on a magnetocaloric response in an Ising-spin system with a high level of geometrical frustration. The origin of the observed behavior is discussed. (C) 2019 Elsevier B.V. All rights reserved.

Název v anglickém jazyce

Relaxation phenomena and magnetocaloric effect in the dynamic spin ice Pr2Sn2O7

Popis výsledku anglicky

Spin relaxation and a magnetocaloric effect in a dipolar spin ice Pr2Sn2O7 were investigated by magnetization and alternating susceptibility measurements in Kelvin temperature range and magnetic fields exceeding the estimated value of the saturation field B-sat. An analysis of AC susceptibility revealed existence of two relaxation channels. The calculation of energy spectrum of a single tetrahedron suggests that a fast temperature independent relaxation may be associated with a cross-tunneling process, in which four spins in one tetrahedron are involved. In contrast, a slow relaxation is attributed to a phonon-bottleneck effect. A particle-size analysis identifies a phonon scattering in grain boundaries as a governing mechanism of the phonon bottleneck. Systematic measurements of the magnetization were performed to study magnetocaloric effect in Pr2Sn2O7. A complex analysis of the isothermal change of magnetic entropy Delta S-m revealed a dominating effect of magnetocrystalline anisotropy on a magnetocaloric response in an Ising-spin system with a high level of geometrical frustration. The origin of the observed behavior is discussed. (C) 2019 Elsevier B.V. All rights reserved.

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/LM2018096" target="_blank" >LM2018096: Laboratoř pro syntézu a měření materiálů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Alloys and Compounds

ISSN

0925-8388

e-ISSN

—

Svazek periodika

808

Číslo periodika v rámci svazku

5. listopadu

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

6

Strana od-do

151719

Kód UT WoS článku

000483694900060

EID výsledku v databázi Scopus

2-s2.0-85070372817