材料科学
体积模量
金刚石顶砧
凝聚态物理
居里温度
单斜晶系
相变
结晶学
铁磁性
晶体结构
衍射
物理
光学
化学
作者
T. Eto,Yuki Nakamoto,Tomoko Kagayama,Yasuhiro Adachi,Saori I. Kawaguchi,Naohisa Hirao,Yoshiya Uwatoko,Makoto Nagasako,T. Kanomata
出处
期刊:Physical review
日期:2024-01-03
卷期号:109 (1)
标识
DOI:10.1103/physrevb.109.014101
摘要
The effect of pressure on the crystal structure of ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ was investigated up to 41 GPa using in situ angle-dispersive x-ray diffraction with synchrotron radiation, an imaging plate detector, and a diamond anvil cell. A pressure-induced transition from a cubic $L{2}_{1}$ structure (space group $\mathit{Fm}\overline{3} m$) to a 10-layer modulated monoclinic structure ($C2/m$) with a distortion of $\ensuremath{\beta}\ensuremath{\sim}{92}^{\ensuremath{\circ}}$ occurred at a pressure of 19.1 GPa or lower. The volume change at the martensitic transition is a minute value of about $\ensuremath{-}0.1%$. The bulk modulus for the low-pressure phase is 147(2) GPa, consistent with previous studies. In contrast, the bulk modulus for the high-pressure phase is 229(4) GPa, significantly higher than the former bulk modulus. Initial permeability measurements of the ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ were also conducted at various pressures up to 1 GPa. The pressure dependencies of the Curie temperature, premartensitic, and martensitic transition temperatures are discussed in detail.
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