TY - JOUR
T1 - Emission Mössbauer studies of the magnetoresistive compound, La0.7Sr0.3MnO3
AU - Nath, Amar
AU - Chechersky, Vladimir
AU - Ramanujachary, K. V.
AU - Butterick, Robert
AU - Lofland, Sam
AU - Preite, Steve
N1 - Funding Information:
AN thanks the donors of the PRF administered by the ACS for partial support of this research. Helpful suggestions from Airat Khasanov are gratefully acknowledged.
PY - 2006/5
Y1 - 2006/5
N2 - The magnetic behavior of the Sr0.3 manganite is studied using a local microprobe, 57Co. In contrast with Ca substituted manganites, a much larger fraction of the material exhibits short-range order with superparamagnetic-like behavior even at 80 K. The differences in behavior are attributed to the large mismatch between the ionic radii of La+3 and the divalent substituent Sr+2, which introduces anharmonicity in local vibrations. In common with all other compounds exhibiting negative bulk magnetoresistivity, the Sr0.3 compound also exhibits very marked softening of lattice as one approaches Tc from below. Application of an external magnetic field results in coalescing of nanosized magnetic clusters to form larger ones with better alignment of spins.
AB - The magnetic behavior of the Sr0.3 manganite is studied using a local microprobe, 57Co. In contrast with Ca substituted manganites, a much larger fraction of the material exhibits short-range order with superparamagnetic-like behavior even at 80 K. The differences in behavior are attributed to the large mismatch between the ionic radii of La+3 and the divalent substituent Sr+2, which introduces anharmonicity in local vibrations. In common with all other compounds exhibiting negative bulk magnetoresistivity, the Sr0.3 compound also exhibits very marked softening of lattice as one approaches Tc from below. Application of an external magnetic field results in coalescing of nanosized magnetic clusters to form larger ones with better alignment of spins.
UR - http://www.scopus.com/inward/record.url?scp=33646081535&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646081535&partnerID=8YFLogxK
U2 - 10.1016/j.ssc.2006.03.010
DO - 10.1016/j.ssc.2006.03.010
M3 - Article
AN - SCOPUS:33646081535
SN - 0038-1098
VL - 138
SP - 224
EP - 228
JO - Solid State Communications
JF - Solid State Communications
IS - 5
ER -