锰氧化物人工低维结构电磁物性及其调控
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摘要
钙钛矿锰氧化物是一种典型的强关联电子体系,多种量子序之间强的关联相互作用使其呈现出许多新奇的物理特性,如电子相分离,庞磁电阻效应等。因此,对锰氧化物的研究一直都是凝聚态物理研究中的热点之一,尤其是对这些奇特物性物理本质以及其在磁电子学和自旋电子学领域的应用的研究。本论文着重关注了锰氧化物中相分离的特性,从结构、光照以及维度三个方面对锰氧化物的相分离特性进行了调控和观测。具体包括以下几个方面:
     1.研究了周期性结构对相分离La0.33Pr0.34Ca0.33MnO3(LPCMO)电输运行为的影响。通过在相分离LPCMO薄膜上构造周期性圆孔阵列结构,在58K温度下,我们获得了电阻变化率约为1600%的巨大的隧穿磁阻效应。这一巨大的隧穿磁阻效应可能来自于周期性圆孔阵列结构对体系相分离的调制作用。此外,通过时间分辨的输运测量,我们进一步观测到了体系的动态相分离特性。电输运测量的实验结果也为我们理解LPCMO体系中相分离的物理图像以及拓展其在磁电子学领域中的应用提供了参考。
     2.研究了光照和Au纳米颗粒对La0.33Pr0.34Ca0.33MnO3(LPCMO)薄膜输运和磁性的影响。实验发现,在LPCMO薄膜表面蒸镀Au纳米颗粒,会抑制薄膜发生绝缘体-金属转变,使得薄膜在低温保持绝缘体的特性;而光照会诱导薄膜在低温下发生绝缘体-金属转变,光照前后样品的电阻变化了约5个量级,而且温度越低,光照引起体系电阻的变化越大。磁性和I-V曲线的测量表明,光照引起薄膜电阻减小源自于光照诱导体系中的铁磁金属相增多。结合光照和Au纳米颗粒的调制手段,为基于锰氧化物的电子制备(Electronic nanofabrication)提供了可能。
     3.证实了La0.33Pr0.34Ca0.33MnO3(LPCMO)一维纳米线结构中存在着电子相分离特性。以MgO纳米线为模板外延生长了LPCMO纳米线结构。磁性,电子自旋共振的结果表明在低温下,LPCMO纳米线样品表现为明显的铁磁特性,而拉曼实验结果则表明在低温下LPCMO纳米线中存在着反铁磁相,进一步证实了电子相分离在LPCMO一维纳米线结构中的存在,为基于量子限域尺寸下的相分离锰氧化物电磁物性的研究和调控提供了可能。
Perovskite manganites are typical strongly correlated electronic materials. Several novel properties, such as electronic phase separation, colossal magnetoresistance (CMR), etc, has been found in manganites due to the strong correlation interactions between multiple degrees of freedoms. By effective modulating these novel properties would realize the application of manganites in magneto electronics and spintronics, and therefore, the researches on manganites has been the hot spot in the condensed matter physics. In this thesis, we focus on the measurement and modulation of the electronic phase separation properties in manganites. The details are as follows:
     1. Researches on the spatial modulations on the transport behaviors of the Lao.33Pro.34Cao.33MnO3(LPCMO). Huge intrinsic tunnel magnetoresistance effects at low field are demonstrated in macroscopic LPCMO thin films etched with periodic antidot arrays. A highest magnetoresistance ratio (about1600%) is achieved at58K, and might originate from delicate phase separation and coherent transport under the applied periodic spatial confinement. Dynamic phase separation is also revealed in such systems due to phase competition. Our findings pave a way to realize tunnel magnetoresistance devices based on electronically phase separated materials with spatial modulations.
     2. Researches on the effect of light and Au nanoparticles on the transport and magnetic properties of the La0.33Pr0.34Ca0.33MnO3(LPCMO). Au nanoparticles would supress the insulator-metal transition in the LPCMO, while light would induce the insulator-metal transistion in the LPCMO at low temperature. The resistance reduced almost5order at10K after the light illumination, and the lower the temperature, the large change of the resistance. Magnetic and I-V curves measurement reveal that light would transform the charge ordered insulating phase to the ferromagnetic metallic phase, and result in the reduction of the resistance of the LPCMO. By combining the two modulations, light and Au nanopaticles, we might realize the electronic nanofabrication on the manganites.
     3. Researches on the electronic phase separation in the one dimensional (1D) La0.33Pr0.34Ca0.33MnO3(LPCMO) nanowires. High quality LPCMO has been epitaxial grown on the MgO nanowires. Magnetic and electron spin resonance measurement illustrate that the LPCMO nanowires undergoes a ferromagnetic transformation at low temperature, while the Raman data reveal that the exsitence of the antiferromagnetic phase at low temperature. These results confirmed that the existence of electronic phase separation in the1D manganites nanowires. These findings would shed new light on the researches on the reveal and modulation of the electronic phase separation in manganites under the quantum confined size.
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