Strain-induced dimensionality crossover of precursor modulations in Ni2MnGa

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

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Author(s)

  • Zhihua Nie
  • Yandong Wang
  • Shunli Shang
  • Qiaoshi Zeng
  • Dongmei Liu
  • Wenge Yang
  • Yi Wang
  • Zi-Kui Liu

Detail(s)

Original languageEnglish
Article number021910
Journal / PublicationApplied Physics Letters
Volume106
Issue number2
Publication statusPublished - 12 Jan 2015
Externally publishedYes

Abstract

Precursor modulations often occur in functional materials like magnetic shape memory alloys, ferroelectrics, and superconductors. In this letter, we have revealed the underlying mechanism of the precursor modulations in ferromagnetic shape memory alloys Ni2MnGa by combining synchrotron-based x-ray diffraction experiments and first-principles phonon calculations. We discovered the precursor modulations along [011] direction can be eliminated with [001] uniaxial loading, while the precursor modulations or premartensite can be totally suppressed by hydrostatic pressure condition. The TA2 phonon anomaly is sensitive to stress induced lattice strain, and the entire TA2 branch is stabilized along the directions where precursor modulations are eliminated by external stress. Our discovery bridges precursor modulations and phonon anomalies, and sheds light on the microscopic mechanism of the two-step superelasticity in precursor martensite.

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Citation Format(s)

Strain-induced dimensionality crossover of precursor modulations in Ni2MnGa. / Nie, Zhihua; Wang, Yandong; Shang, Shunli; Zeng, Qiaoshi; Ren, Yang; Liu, Dongmei; Yang, Wenge; Wang, Yi; Liu, Zi-Kui.

In: Applied Physics Letters, Vol. 106, No. 2, 021910, 12.01.2015.

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