基于隧穿磁电阻对新型电子掺杂锰氧化物La0.7Ce0.3MnO3少数自旋特性的观测
Observation of minority spin character of the new electron doped manganite La0.7Ce0.3MnO3 from tunneling magnetoresistance.
作者信息
Mitra C, Raychaudhuri P, Dörr K, Müller K-H, Schultz L, Oppeneer P M, Wirth S
机构信息
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany.
出版信息
Phys Rev Lett. 2003 Jan 10;90(1):017202. doi: 10.1103/PhysRevLett.90.017202. Epub 2003 Jan 8.
We report the magnetotransport characteristics of a trilayer ferromagnetic tunnel junction built of an electron doped manganite (La0.7Ce0.3MnO3) and a hole doped manganite (La0.7Ca0.3MnO3). At low temperatures the junction exhibits a large positive tunneling magnetoresistance (TMR), irrespective of the bias voltage. At intermediate temperatures below T(C) the sign of the TMR is dependent on the bias voltage across the junction. The magnetoresistive characteristics of the junction strongly suggest that La0.7Ce0.3MnO3 is a minority spin carrier ferromagnet with a high degree of spin polarization, i.e., a transport half-metal.
我们报道了由电子掺杂锰氧化物（La0.7Ce0.3MnO3）和空穴掺杂锰氧化物（La0.7Ca0.3MnO3）构成的三层铁磁隧道结的磁输运特性。在低温下，该结表现出较大的正隧穿磁电阻（TMR），与偏置电压无关。在低于居里温度（Tc）的中间温度下，TMR的符号取决于结两端的偏置电压。该结的磁电阻特性强烈表明，La0.7Ce0.3MnO3是一种具有高度自旋极化的少数自旋载流子铁磁体，即一种输运半金属。
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