The semiconductor industry has been developed for more than 40 years following the Moore's Law. With the size of transistors being shrinking down to tenth of nanometer scale, the quantum effects start to dominate and cause problems such as operation stability and heat generations [Fig. 1a] . An alternative route is to develop new functional materials and their architectures. Complex oxide is one of the most promising candidates. Recently, scientists have shown novel phenomena of complex oxide at nanometer length scale and its potential for applications.
In the article "Spatial confinement tuning of quenched disorder effects and enhanced magnetoresistance in manganite nanowires" published in SCIENCE CHINA Physics, Mechanics & Astronomy (First author: Yang Yu, Corresponding authors: Hangwen Guo, Lifeng Yin, Jian Shen), scientists has fabricated a series of complex oxide known as manganites nanowires ranging from 5 μm to 50 nm, by using state-of-the-art nanolithography techniques [Fig. 1b] .
(a) Moore's law: the number of transistors per microprocessor chip has roughly doubled every two years . (b) a 100 nm manganite nanowire fabricated. (c) The transport properties of the nanowires showing significantly enhanced quenched disorder effects in 50 nm nanowire.
Credit: ©Science China Press
From transport and magnetic imaging measurements, scientist reveals that when the nanowire size is smaller, the effect of quenched disorder becomes significantly enhanced----a new phenomenon that has not been identified before at nanometer scale [Fig. 1c].
Quenched disorder: In condensed matter physics, quenched disorder usually refers to the randomness in a material which is "frozen" or "quenched" at all times. The most common source of quenched disorder comes from impurities or chemical dopants. Quenched disorder plays significant roles in complex oxide systems.
Extensive theoretical treatments have shown the critical role of quenched disorder in complex oxide systems such as high-Tc cuprates and colossal magnetoresistive manganites.
Experimental investigations, on the other hand, are rather complicated. The most common way to control quenched disorder is by chemical doping. However, chemical doping simultaneously alters material's chemical environments, structures, etc., clouding the impact of quenched disorder.
In this article, the scientist shows that spatial confinement is a clean and effective way to study quenched disorder effect without changing the chemical environments, structure and other physical parameters.
The results reveal that enhanced quenched disorder not only can alter the nature of electronic and magnetic phase transition, but increase the magnetoreisistance up to 820000 %, a 200 times enhancement to its original values. These phenomena offer new routes on the understanding of complex materials at nanometer scales and their potential applications.
This work was supported by the National Key Research and Development Program of China (2016YFA0300702); Shanghai Municipal Natural Science Foundation (18JC1411400, 18ZR1403200, 17ZR1442600); the Program of Shanghai Academic Research Leader (18XD1400600, 17XD1400400); the China Postdoctoral Science Foundation (2016M601488, 2017T100265).
See the article:
Yang Yu, Qiang Li, Qian Shi, YinYan Zhu, HanXuan Lin, Hao Liu, HongYan Chen, Tian Miao, Yu Bai, YanMei Wang, WenTing Yang, WenBin Wang, HangWen Guo, LiFeng Yin, and Jian Shen. Spatial confinement tuning of quenched disorder effects and enhanced magnetoresistance in manganite nanowires. Sci. China-Phys. Mech. Astron. 63, 237811 (2020).
 M. M. Waldrop, Nature 530, 144 (2016).
 Y. Yu, Q. Li, Q. Shi, Y. Y. Zhu, H. X. Lin, H. Liu, H. Y. Chen, T. Miao, Y. Bai, Y. M. Wang, W. T. Yang, W. B. Wang, H. W. Guo, L. F. Yin, and J. Shen, Sci. China-Phys. Mech. Astron. 63, 237811 (2020).
YAN Bei | EurekAlert!
Fraunhofer starts development of refrigerant-free, energy-efficient electrocaloric heat pumps
09.12.2019 | Fraunhofer IPM
A solution for cleaning up PFAS, one of the world's most intractable pollutants
06.12.2019 | Colorado State University
Vaccinia viruses serve as a vaccine against human smallpox and as the basis of new cancer therapies. Two studies now provide fascinating insights into their unusual propagation strategy at the atomic level.
For viruses to multiply, they usually need the support of the cells they infect. In many cases, only in their host’s nucleus can they find the machines,...
More than one hundred and fifty years have passed since the publication of James Clerk Maxwell's "A Dynamical Theory of the Electromagnetic Field" (1865). What would our lives be without this publication?
It is difficult to imagine, as this treatise revolutionized our fundamental understanding of electric fields, magnetic fields, and light. The twenty original...
In a joint experimental and theoretical work performed at the Heidelberg Max Planck Institute for Nuclear Physics, an international team of physicists detected for the first time an orbital crossing in the highly charged ion Pr⁹⁺. Optical spectra were recorded employing an electron beam ion trap and analysed with the aid of atomic structure calculations. A proposed nHz-wide transition has been identified and its energy was determined with high precision. Theory predicts a very high sensitivity to new physics and extremely low susceptibility to external perturbations for this “clock line” making it a unique candidate for proposed precision studies.
Laser spectroscopy of neutral atoms and singly charged ions has reached astonishing precision by merit of a chain of technological advances during the past...
The ability to investigate the dynamics of single particle at the nano-scale and femtosecond level remained an unfathomed dream for years. It was not until the dawn of the 21st century that nanotechnology and femtoscience gradually merged together and the first ultrafast microscopy of individual quantum dots (QDs) and molecules was accomplished.
Ultrafast microscopy studies entirely rely on detecting nanoparticles or single molecules with luminescence techniques, which require efficient emitters to...
Graphene, a two-dimensional structure made of carbon, is a material with excellent mechanical, electronic and optical properties. However, it did not seem suitable for magnetic applications. Together with international partners, Empa researchers have now succeeded in synthesizing a unique nanographene predicted in the 1970s, which conclusively demonstrates that carbon in very specific forms has magnetic properties that could permit future spintronic applications. The results have just been published in the renowned journal Nature Nanotechnology.
Depending on the shape and orientation of their edges, graphene nanostructures (also known as nanographenes) can have very different properties – for example,...
03.12.2019 | Event News
15.11.2019 | Event News
15.11.2019 | Event News
13.12.2019 | Physics and Astronomy
13.12.2019 | Physics and Astronomy
13.12.2019 | Materials Sciences