TY - JOUR
T1 - Weak charge-ordering behavior in phase separated (Ln1/3Sm2/3)2/3Ca1/3MnO3 (Ln=Pr and La) manganites
AU - Asthana, Saket
AU - Dho, Joonghoe
AU - Bahadur, D.
PY - 2007/9
Y1 - 2007/9
N2 - We have studied a weak charge-ordering behavior in phase separated (Ln1/3Sm2/3)2/3Ca1/3MnO3 (Ln=Pr and La) manganites with same hole doping but slightly different tolerance factors. The M (T) and ρ (T) curves of the Pr-sample showed an anomaly caused by a weak charge-order (CO) transition at ∼210 K, while that of La-sample did not. However, the La-sample displayed a weak anomaly related to the CO instability in the derivative curve of the temperature dependent magnetoresistance. This result is understood on the basis that the CO phase in La-sample is partly suppressed by a large magnetic field of ∼80 kOe, while in Pr-sample it is not collapsed in that field scale. Our data support the existence of charge-ordering, electronic phase separation and a field-induced reduction of weak CO instability for La-sample, which can contribute towards high MR especially at lower temperatures due to partial melting of CO phase and/or percolation behavior.
AB - We have studied a weak charge-ordering behavior in phase separated (Ln1/3Sm2/3)2/3Ca1/3MnO3 (Ln=Pr and La) manganites with same hole doping but slightly different tolerance factors. The M (T) and ρ (T) curves of the Pr-sample showed an anomaly caused by a weak charge-order (CO) transition at ∼210 K, while that of La-sample did not. However, the La-sample displayed a weak anomaly related to the CO instability in the derivative curve of the temperature dependent magnetoresistance. This result is understood on the basis that the CO phase in La-sample is partly suppressed by a large magnetic field of ∼80 kOe, while in Pr-sample it is not collapsed in that field scale. Our data support the existence of charge-ordering, electronic phase separation and a field-induced reduction of weak CO instability for La-sample, which can contribute towards high MR especially at lower temperatures due to partial melting of CO phase and/or percolation behavior.
KW - A. Manganites
KW - D. Colossal magnetoresistance
KW - D. Electronic phase separation
KW - D. Magnetoresistance
UR - http://www.scopus.com/inward/record.url?scp=34548008573&partnerID=8YFLogxK
U2 - 10.1016/j.ssc.2007.07.008
DO - 10.1016/j.ssc.2007.07.008
M3 - Article
AN - SCOPUS:34548008573
SN - 0038-1098
VL - 143
SP - 522
EP - 526
JO - Solid State Communications
JF - Solid State Communications
IS - 11-12
ER -