Adiabatic small polaron hopping conduction in La0.7Nd0.3Mn0.8Cr0.2O3

作者：Jung Woo Hwan^*

来源：Physica B: Condensed Matter , 2009, 404(14-15): 1953-1956.

DOI：10.1016/j.physb.2009.03.017

• Adiabatic
• Hopping
• Non-adiabatic
• Small polaron

The dc conductivity and magnetization of insulating La0.7Nd0.3Mn0.8Cr0.2O3 were measured in temperature ranges of 77-300 and 4.2-300K, respectively. La0.7Nd0.3Mn0.8Cr0.2O3 shows a ferromagnetic transition around 130 K but the sample is insulating throughout the temperature range studied. The temperature dependence of conductivity shows that electronic transport in La0.7Nd0.3Mn0.8Cr0.2O3 is well described by the Emin-Holstein adiabatic small polaron hopping model. The polaron density extracted from conductivity measurements is about 3.0 x 10(20) cm(-3). This result agrees well with the nominal polaron density for La0.7Nd0.3Mn0.8Cr0.2O3, which is also roughly 3.0 x 10(20) cm(-3). We also derived important quantities for transport in La0.7Nd0.3Mn0.8Cr0.2O3.

• 出版日期2009-7-1