Thickness-driven first-order phase transitions in manganite ultrathin films

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hongyan Chen
  • Yang Yu
  • Zhe Wang
  • Yu Bai
  • Hanxuan Lin
  • Xiaolong Li
  • Hao Liu
  • Tian Miao
  • Yunfang Kou
  • Yongsheng Zhang
  • Yan Li
  • Jin Tang
  • Zechao Wang
  • Peng Cai
  • Yinyan Zhu
  • Zhaohua Cheng
  • Wenbin Wang
  • Xingyu Gao
  • Lifeng Yin
  • Ruqian Wu
  • Jian Shen

Detail(s)

Original languageEnglish
Article number214419
Journal / PublicationPhysical Review B
Volume99
Issue number21
Publication statusPublished - 12 Jun 2019
Externally publishedYes

Abstract

We report thickness dependent inhomogeneous antiferromagnetic (AFM) to ferromagnetic (FM) phase transitions in ultrathin La0.7Sr0.3MnO3 (LSMO) films grown on the SrTiO3 substrate. When the films are 4-7 unit cells (UCs) thick, FM domains appear as isolated nanodisks in the AFM matrix that together floats on top of the three AFM base UCs, leading a superparamagnetic blocking behavior. Our first principles calculations unravel the rather counterintuitive physical origin of this mixed phase state; the formation of FM/AFM domain boundaries is energetically favorable. At 8 UCs, an abrupt shear strain relief occurs in the LSMO thin film and twinning patterns with two unit cell periodicity form along the [010] and [100] directions. Our studies reveal the complexity of the magnetic phase transition at the nanometer scale and open a door for the development of quantum devices and statistical theories.

Citation Format(s)

Thickness-driven first-order phase transitions in manganite ultrathin films. / Chen, Hongyan; Yu, Yang; Wang, Zhe; Bai, Yu; Lin, Hanxuan; Li, Xiaolong; Liu, Hao; Miao, Tian; Kou, Yunfang; Zhang, Yongsheng; Li, Yan; Tang, Jin; Wang, Zechao; Cai, Peng; Zhu, Yinyan; Cheng, Zhaohua; Zhong, Xiaoyan; Wang, Wenbin; Gao, Xingyu; Yin, Lifeng; Wu, Ruqian; Shen, Jian.

In: Physical Review B, Vol. 99, No. 21, 214419, 12.06.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review