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19 April 2024

» arxiv » cond-mat/0506448

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Non-linear effects and Joule heating in I-V curves in manganites
Silvana Mercone ; Raymond Fresard ; Vincent Caignaert ; Christine Martin ; Damien Saurel ; Charles Simon ; Gilles Andre ; Philippe Monod ; Francois Fauth ;
Date:	17 Jun 2005
Subject:	Strongly Correlated Electrons \| cond-mat.str-el
Abstract:	We study the influence of the Joule effect on the non-linear behavior of the transport I-V curves in polycrystalline samples of the manganite Pr0.8Ca0.2MnO3 by using the crystalline unit cell parameters as an internal thermometer in X-ray and neutron diffraction. We develop a simple analytical model to estimate the temperature profile in the samples. Under the actual experimental conditions we show that the internal temperature gradient or the difference between the temperature of the sample and that of the thermal bath are at the origin of the non-linearity observed in the I-V curves. Consequences on other compounds with colossal magnetoresistance are also discussed.
Source:	arXiv, cond-mat/0506448
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