Spontaneous generation of voltage in the magnetocaloric compound La(Fe0.88Si0.12)(13) and comparison to SmMn2Ge2

TitleSpontaneous generation of voltage in the magnetocaloric compound La(Fe0.88Si0.12)(13) and comparison to SmMn2Ge2
Publication TypeJournal Article
Year of Publication2009
AuthorsZou M, Sampaio JA, Pecharsky VK, Gschneidner KA
Journal TitlePhysical Review B
Volume80
Pages172403
Date PublishedNov
ISBN Number1098-0121
Accession NumberISI:000272310400010
Keywordsgd5si2ge2, iron compounds, lanthanum compounds, magnetic transitions, magnetocaloric effects, manganese compounds, samarium compounds, TRANSFORMATION
Abstract

Relationships among spontaneous generation of voltage (SGV), magnetocaloric effect, temperature induced first-order magnetic phase transformation, and its thermal effect have been studied based on experimental results of La(Fe0.88Si0.12)(13) and SmMn2Ge2 compounds. Remarkable differences in magnetocaloric effects and temperature-induced unit-cell volume changes during their first-order magnetic phase transformations lead to dramatic differences in their SGV effects. Both temperature and magnetic field trigger SGV in La(Fe0.88Si0.12)(13) compound, but no SGV has been observed in SmMn2Ge2. Our results clarify that it is not the first-order crystallographic or magnetic phase transformation per se, but the strong thermal effects, i.e., latent heat and magnetocaloric effect that play the key role in the SGV mechanism.

URL<Go to ISI>://000272310400010
DOI10.1103/Physrevb.80.172403