TY - JOUR
T1 - A-site-disorder-dependent percolative transport and Griffiths phase in doped manganites
AU - Rama, N.
AU - Ramachandra Rao, M. S.
AU - Sankaranarayanan, V.
AU - Majewski, P.
AU - Gepraegs, S.
AU - Opel, M.
AU - Gross, R.
PY - 2004/12
Y1 - 2004/12
N2 - The influence of A site disorder on the magnetic and transport properties of Pr0.6R0.1Sr0.3MnO3 (R = Tb, Y, Ho, and Er) polycrystalline samples is analyzed within the context of percolative transport and the existence of the Griffiths phase. The temperature dependence of the average spin moment at the hopping sites and the fraction of metallic clusters bear signatures of the onset of the Griffiths phase. Our analysis suggests that the paramagnetic phase comprises of insulating correlated spin clusters that coexist with ferromagnetic metallic clusters and paramagnetic spins. This coexistence was found to be sensitive to the A-site disorder.
AB - The influence of A site disorder on the magnetic and transport properties of Pr0.6R0.1Sr0.3MnO3 (R = Tb, Y, Ho, and Er) polycrystalline samples is analyzed within the context of percolative transport and the existence of the Griffiths phase. The temperature dependence of the average spin moment at the hopping sites and the fraction of metallic clusters bear signatures of the onset of the Griffiths phase. Our analysis suggests that the paramagnetic phase comprises of insulating correlated spin clusters that coexist with ferromagnetic metallic clusters and paramagnetic spins. This coexistence was found to be sensitive to the A-site disorder.
UR - http://www.scopus.com/inward/record.url?scp=13844252127&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.70.224424
DO - 10.1103/PhysRevB.70.224424
M3 - Article
AN - SCOPUS:13844252127
SN - 1098-0121
VL - 70
SP - 224424-1-224424-5
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 22
M1 - 224424
ER -