论文标题
低载体密度的铁磁铁是否是理解高温超导体的关键？
Does a low-carrier density ferromagnet hold the key to understanding high temperature superconductors?
论文作者
论文摘要
我们在铁磁半金属EUB $ _6 $上进行了小角度的中子散射实验（SAN），我们观察到直接证据证明存在磁性极性。我们在各种散射向量$ | \ vec {q} | $从0.006到0.140〜Å$^{ - 1} $和2至60〜k进行的SANS实验。在$ t _ {\ mathrm {c}} $我们的实验表现出磁散射强度，该强度对波向量具有磁性散射强度，这是磁性偏振子的存在的特征。在$ t _ {\ mathrm {c}} $下方的低于极地合并，并且大多数观察到的强度是由于域中的散射。我们能够提取相关长度$ξ$，从$ 100 $ $ 100 $到$ 300 $〜$ 300 $ 〜〜〜〜这种尺寸远大于对磁波动的预期，这表明磁极对相变的影响。我们能够提取相关长度$ξ$，范围从$ 100 $到$ 300 $〜$ 〜〜磁极的大小。这种尺寸远大于对磁波动的预期，这表明磁极对相变的影响。
We conducted a small-angle neutron scattering experiments (SANS) on the ferromagnetic semi-metal EuB$_6$, where we observed direct evidence for the presence of magnetic polarons. We carried out SANS experiments over a large range of scattering vectors $|\vec{q}|$ from 0.006 to 0.140~Å$^{-1}$ and 2 to 60~K. Just above $T_{\mathrm{C}}$ our experiments show magnetic scattering intensity, which has a Lorentzian dependence on the wave vector, which is characteristic for the presence of magnetic polarons. Below $T_{\mathrm{C}}$ the polarons merge and most of the observed intensity is due to scattering from domain walls.We were able to extract a correlation length $ξ$ which ranges from $100$ to $300$~Å for the size of the magnetic polarons. This size is much larger than one would expect for magnetic fluctuations, demonstrating the influence the magnetic polarons on the phase transition. We were able to extract a correlation length $ξ$ which ranges from $100$ to $300$~Å for the size of the magnetic polarons. This size is much larger than one would expect for magnetic fluctuations, demonstrating the influence the magnetic polarons on the phase transition.
