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Tunnelling spectroscopy and the density of states of $La_{0.8}Ca_{0.2}MnO_3$

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Institute of Physics
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Keywords
  • Physics
Disciplines
  • Physics

Abstract

We have used tunnelling spectroscopy (TS) to probe the density of states (DOS) near the Fermi level $(E_F)$ of $La_{0.8}Ca_{0.2}MnO_3$, which shows giant magnetoresistance (GMR). The tunnelling current–voltage (I–V ) curves and their derivatives (dI/dV ) show significant changes for temperatures above and below the ferromagnetic Curie temperature $(T_C)$. We have estimated the energy dependence of the DOS near $E_F$ from the tunnelling spectroscopy data, and this shows a strong temperature dependence, for temperatures above and below $T_C$.

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