# Temperature dependence of the Spin Seebeck effect in a mixed valent manganite

## TL;DR

This study investigates how the Longitudinal Spin Seebeck Effect in a mixed valent manganite varies with temperature, revealing distinct behaviors of different thermally driven phenomena and emphasizing the need to distinguish their contributions.

## Contribution

It provides the first detailed analysis of temperature-dependent LSSE in La$_{0.7}$Ca$_{0.3}$MnO$_3$, including disentangling contributions from the Anisotropic Nernst effect.

## Key findings

- LSSE follows a T^{0.55} dependence at low temperatures.
- The LSSE and magnetization exponents differ across the transition.
- Disentangling mechanisms is crucial for understanding spin Seebeck signals.

## Abstract

We report on temperature dependent measurements of the Longitudinal Spin Seebeck Effect (LSSE) in the mixed valent manganite La$_{0.7}$Ca$_{0.3}$MnO$_3$. By disentangling the contribution arising due to the Anisotropic Nernst effect, we observe that these two thermally driven phenomena vary disparately with temperature. In a narrow low temperature regime, the LSSE exhibits a $T^{0.55}$ dependence, which matches well with that predicted by the magnon-driven spin current model. Across the double exchange driven paramagnetic-ferromagnetic transition, the LSSE exponent is significantly higher than the magnetization one. These observations highlights the importance of individually ascertaining the temperature evolution of different mechanisms which contribute to the measured spin Seebeck signal.