论文标题
部分可观测时空混沌系统的无模型预测
Martensitic transformation in V_3Si single crystal: ^51V NMR evidence for coexistence of cubic and tetragonal phases
论文作者
论文摘要
A15二进制合金超导体V_3SI中的Martensitic转换（MT）虽然进行了广泛的研究，但尚未与过渡到超导性的过渡结束。先前的NMR研究主要是在粉末样品上，并且在转化过程中几乎不强调温度依赖性。在这里，我们研究了高质量的单晶，其中 ^51V的NMR光谱对NMR光谱进行了四极分裂，使我们能够从V的横向链中区分光谱是温度的函数。 Our data revealed that (1) the MT is not abrupt, but rather there is a microscopic coexistence of pre-transformed cubic phase and transformed tetragonal phase over a few K below and above Tm, while (2) no pre-transformed phase can be found at Tc, and (3) the Martensitic lengthening of one axis occurs predominantly in a plane perpendicular to the crystal growth axis, as twinned域。
The Martensitic transformation (MT) in A15 binary-alloy superconductor V_3Si, though studied extensively, has not yet been conclusively linked with a transition to superconductivity. Previous NMR studies have mainly been on powder samples and with little emphasis on temperature dependence during the transformation. Here we study a high-quality single crystal, where quadrupolar splitting of NMR spectra for ^51V allowed us to distinguish between spectra from transverse chains of V as a function of temperature. Our data revealed that (1) the MT is not abrupt, but rather there is a microscopic coexistence of pre-transformed cubic phase and transformed tetragonal phase over a few K below and above Tm, while (2) no pre-transformed phase can be found at Tc, and (3) the Martensitic lengthening of one axis occurs predominantly in a plane perpendicular to the crystal growth axis, as twinned domains.
