Ellipsometry applied to phase transitions and relaxation phenomena in Ni2MnGa ferromagnetic shape memory alloy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F12%3A00381823" target="_blank" >RIV/68378271:_____/12:00381823 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1063/1.4757393" target="_blank" >http://dx.doi.org/10.1063/1.4757393</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4757393" target="_blank" >10.1063/1.4757393</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ellipsometry applied to phase transitions and relaxation phenomena in Ni2MnGa ferromagnetic shape memory alloy

Popis výsledku v původním jazyce

The temperature dependences of the refractive index, n(T), calculated from ellipsometric data during the premartensitic and martensite transitions in a Ni2MnGa ferromagnetic shape memory alloy allow to detect all critical temperatures of the sample. Theperformed measurements reveal the behavior of a surface layer of a few tens nanometers depth due to the light absorption. The underlying mechanisms of the observed temperature changes of the equilibrium n0 may be related to temperature dependent interactions between free electrons and phonons as well as between electrons and defects.A giant isothermal creep (up to 20%) of the refractive index was found for temperatures below T0 = 315 K. Below T0 the creep amplitude grows with the temperature differenceT0 - T. The creep disappears and the relaxation time becomes zero at temperatures about T0 .

Název v anglickém jazyce

Ellipsometry applied to phase transitions and relaxation phenomena in Ni2MnGa ferromagnetic shape memory alloy

Popis výsledku anglicky

The temperature dependences of the refractive index, n(T), calculated from ellipsometric data during the premartensitic and martensite transitions in a Ni2MnGa ferromagnetic shape memory alloy allow to detect all critical temperatures of the sample. Theperformed measurements reveal the behavior of a surface layer of a few tens nanometers depth due to the light absorption. The underlying mechanisms of the observed temperature changes of the equilibrium n0 may be related to temperature dependent interactions between free electrons and phonons as well as between electrons and defects.A giant isothermal creep (up to 20%) of the refractive index was found for temperatures below T0 = 315 K. Below T0 the creep amplitude grows with the temperature differenceT0 - T. The creep disappears and the relaxation time becomes zero at temperatures about T0 .

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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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

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

Applied Physics Letters

ISSN

0003-6951

e-ISSN

—

Svazek periodika

101

Číslo periodika v rámci svazku

14

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

—

Kód UT WoS článku

000309603300042

EID výsledku v databázi Scopus

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