期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 114, 期 26, 页码 E5062-E5069出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1706814114
关键词
spin-lattice coupling; interfaces; magnetic/electric; structural transition; ultrathin films
资金
- US Department of Energy (DOE) [DOE DE-SC0002136]
- US DOE Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-98CH10886]
- National Natural Science Foundation of China [11674055]
- DOE [DE-FG02-09ER46554]
- Titan Supercomputer of the Oak Ridge Leadership Computing Facility [MAT136]
- DOE, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
Interfaces between materials present unique opportunities for the discovery of intriguing quantum phenomena. Here, we explore the possibility that, in the case of superlattices, if one of the layers is made ultrathin, unexpected properties can be induced between the two bracketing interfaces. We pursue this objective by combining advanced growth and characterization techniques with theoretical calculations. Using prototype La2/3Sr1/3MnO3 (LSMO)/BaTiO3 (BTO) superlattices, we observe a structural evolution in the LSMO layers as a function of thickness. Atomic-resolution EM and spectroscopy reveal an unusual polar structure phase in ultrathin LSMO at a critical thickness caused by interfacing with the adjacent BTO layers, which is confirmed by first principles calculations. Most important is the fact that this polar phase is accompanied by reemergent ferromagnetism, making this system a potential candidate for ultrathin ferroelectrics with ferromagnetic ordering. Monte Carlo simulations illustrate the important role of spin-lattice coupling in LSMO. These results open up a conceptually intriguing recipe for developing functional ultrathin materials via interface-induced spin-lattice coupling.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据