Structure, Tranport and Magnetism of La(0.67)Ca(0.33)Mn(1-x)Ta(x)O(3)

TL;DR

This study investigates how pentavalent substitution at the manganese site in La(0.67)Ca(0.33)MnO(3) affects its magnetic and electronic properties, revealing a transition from ferromagnetic-metallic to cluster-glass insulating states.

Contribution

It is the first to examine the effects of pentavalent substitution at the Mn site in this compound, highlighting the dominant role of valence in modifying its ground state.

Findings

Transition temperature suppression of 39K per at.% substitution

Shift from ferromagnetic-metallic to cluster-glass insulating state beyond x=0.03

Charge state of substituents critically influences magnetic properties

Abstract

For the first time,we report the effect of pentavalent subtitution at the Mn site of La(0.67)Ca(0.33)MnO(3). The ferromagnetic -metallic ground state modifies to a cluster-glass insulator beyond x=0.03. The observed suppression in the transition temperatures (39K/at.%) is the largest reported for the Mn site subtituted manganites. We argue that charge state(valence) of the substituent has a dominant role in affecting the ferromagnetic - metallic ground state of CMR manganites.