Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-11-08
Phys. Rev. B, 73, 035129 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
19 pages including 4 figures
Scientific paper
10.1103/PhysRevB.73.035129
The 'two-electron' doped rare earth mangnites Ca_1-x Ce_x MnO_3 (x = 0.1,0.2) are probed using resistivity, ac susceptibility and electron paramagnetic resonance (EPR) measurements across their respective charge ordering (CO) temperatures T_CO = 173 K and 250 K. The EPR 'g' factor and intensity as well as the transport and magnetic behaviours of the two compositions are qualitatively similar and are as expected for CO systems. However, the EPR linewidth, reflective of the spin dynamics, for x = 0.1, shows a strongly anomalous temperature dependence, decreasing with decreasing temperature below T_CO in contrast with the sample with x = 0.2 and other CO systems. Keeping in view the evidence for magnetic frustration in the system, we propose that the anomalous temperature dependence of the linewidth is the signature of the occurrence of a disorder driven spin liquid phase, present along with charge ordering.
Bhat S. V.
Sarangi Subhasis
Sharma Ajay
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