La0.67Ca0.33MnO3薄膜磁场诱导的各向异性太赫兹传输。

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Structural Dynamics-Us Pub Date : 2021-10-05 eCollection Date: 2021-09-01 DOI:10.1063/4.0000123

Hongying Mei, Peng Zhang, Shile Zhang, Ruxian Yao, Haizi Yao, Feng Chen, Zhenyou Wang, Fuhai Su

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引用次数: 1

摘要

系统地研究了La0.67Ca0.33MnO3薄膜在外磁场和低温条件下在(001)取向NdGaO3衬底上的太赫兹(THz)透射特性。观察到面外和面内磁场方向的太赫兹吸收显著差异，这与使用标准四探针技术的电输运测量一致。此外，我们发现，当磁场垂直于薄膜平面时，复杂的太赫兹电导率可以用德鲁德·史密斯方程来再现，而当施加平面内磁场时，它会偏离该模型。我们认为太赫兹输运动力学的各向异性与钙钛矿结构锰矿的相分离和各向异性磁阻效应密切相关。我们的工作表明，太赫兹时域光谱(TDS)可以作为一种有效的非接触方法来研究钙钛矿结构锰矿的磁输运性质。

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Anisotropic terahertz transmission induced by the external magnetic field in La0.67Ca0.33MnO3 film.

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Anisotropic terahertz transmission induced by the external magnetic field in La_0.67Ca_0.33MnO₃ film.

A systemic investigation of the terahertz (THz) transmission of La_0.67Ca_0.33MnO₃ film on the (001)-oriented NdGaO₃ substrate under external magnetic field and low temperature have been performed. The significant THz absorption difference between the out-of-plane and the in-plane magnetic field direction is observed, which is consistent with the electrical transport measurement using the standard four-probe technique. Furthermore, we find that the complex THz conductivities can be reproduced in terms of the Drude Smith equation as the magnetic field is perpendicular to the film plane, whereas it deviates from this model when the in-plane magnetic field is applied. We suggest that such anisotropies in THz transport dynamics have close correspondences with the phase separation and anisotropic magnetoresistance effects in the perovskite-structured manganites. Our work demonstrates that the THz time-domain spectroscopy (TDS) can be an effective non-contact method for studying the magneto-transport properties of the perovskite-structured manganites.

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来源期刊

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

审稿时长

16 weeks

期刊介绍： Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.