论文标题

六角锰矿中名义中性结构域壁上的固有和外在传导贡献

Intrinsic and extrinsic conduction contributions at nominally neutral domain walls in hexagonal manganites

论文作者

Schultheiß, J., Schaab, J., Småbråten, D. R., Skjærvø, S. H., Bourret, E., Yan, Z., Selbach, S. M., Meier, D.

论文摘要

导电和静电原子力显微镜(CAFM和EFM)用于研究六边形锰矿中名义中性结构域壁的电导。 EFM测量结果表明,移动电荷载体在ERMNO3中名义中性结构域壁上积聚的倾向,通过CAFM扫描证实了局部增强的D.C.电导。我们的发现是基于氧气空位和间质的已建立的隔离焓特征来解释的,为先前的,看似断开的观测值提供了一个显微镜模型,从绝缘到导电壁壁行为。此外,我们观察到不同名义中性壁之间的电导率变化,我们将其归因于批量内部理想的电荷中性结构的偏差,从而导致外在和内在贡献的叠加。我们的研究阐明了六边形锰矿中名义上中性结构域壁上的复杂传输性能,并为基于氧化条件而建立了调整电子响应的新可能性,为基于域壁的传感器技术打开了大门。

Conductive and electrostatic atomic force microscopy (cAFM and EFM) are used to investigate the electric conduction at nominally neutral domain walls in hexagonal manganites. The EFM measurements reveal a propensity of mobile charge carriers to accumulate at the nominally neutral domain walls in ErMnO3, which is corroborated by cAFM scans showing locally enhanced d.c. conductance. Our findings are explained based on established segregation enthalpy profiles for oxygen vacancies and interstitials, providing a microscopic model for previous, seemingly disconnected observations ranging from insulating to conducting domain wall behavior. In addition, we observe variations in conductance between different nominally neutral walls that we attribute to deviations from the ideal charge-neutral structure within the bulk, leading to a superposition of extrinsic and intrinsic contributions. Our study clarifies the complex transport properties at nominally neutral domain walls in hexagonal manganites and establishes new possibilities for tuning their electronic response based on oxidation conditions, opening the door for domain-wall based sensor technology.

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