Zheng P, Xu Y J, Wu W, Xu G, Lv J L, Lin F K, Wang P, Yang Yi-Feng, Luo J L
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China.
Sci Rep. 2017 Oct 27;7(1):14178. doi: 10.1038/s41598-017-14648-7.
Unconventional superconductivity often emerges at the border of long-range magnetic orders. Understanding the low-energy charge dynamics may provide crucial information on the formation of superconductivity. Here we report the unpolarized/polarized optical conductivity study of high quality MnP single crystals at ambient pressure. Our data reveal two types of charge carriers with very different lifetimes. In combination with the first-principles calculations, we show that the short-lifetime carriers have flat Fermi sheets which become gapped in the helimagnetic phase, causing a dramatic change in the low-frequency optical spectra, while the long-lifetime carriers are anisotropic three-dimensional like which are little affected by the magnetic transitions and provide major contributions to the transport properties. This orbital-dependent charge dynamics originates from the special crystal structure of MnP and may have an influence on the unconventional superconductivity and its interplay with helimagnetism at high pressures.
非常规超导性通常出现在长程磁有序的边界。理解低能电荷动力学可能会提供有关超导性形成的关键信息。在此，我们报告了在常压下对高质量MnP单晶进行的非极化/极化光导率研究。我们的数据揭示了两种具有截然不同寿命的电荷载流子。结合第一性原理计算，我们表明短寿命载流子具有平坦的费米面，在螺旋磁相中这些费米面会出现能隙，从而导致低频光谱发生显著变化，而长寿命载流子是各向异性的三维类型，几乎不受磁转变的影响，并且对输运性质有主要贡献。这种与轨道相关的电荷动力学源于MnP的特殊晶体结构，并且可能会对高压下的非常规超导性及其与螺旋磁性的相互作用产生影响。
