论文标题
富含氧气的铜层中的条纹
Stripes in oxygen-enriched cuprates
论文作者
论文摘要
当铜氧化物用异质金属掺杂，例如$ la_ {2-x} sr_xcuo_4 $或氧气（例如$ yba_2cu_3o_ {6+y} $）。其不可通信性的掺杂依赖性中显示了差异：$ q_c（x）\ propto \ sqrt {x- \ check {p}} $，但$ q_c（y）\大约0.3 $。以前的复合家族中的方形依赖性是由于掺杂孔（或电子）之间的库仑排斥而产生的，在$ cuo_2 $ planes的晶格站点$ o $（或$ cu $）原子中成对居住。第二个家庭中几乎恒定的$ q_c（y）$值是由类似臭氧的分子聚集的，该分子是由$ o^{2 - } $离子形成的，带有嵌入式氧原子，$ o_i $，在$ cuo_2 $ planes的间隙地点。磁矩，$ \ mathbf {m}（o）$，是第一个家庭中的lattice-defect $ o $原子，在抗fiferromagnet上排列，这会引起随附的不可固定性$ q_m（x）= q_c（x）= q_c（x）/2 $ $的磁性磁化条纹。臭氧配合物具有消失的磁矩，$ \ mathbf {m} = 0 $，这解释了第二个家庭中没有伴随的磁化条纹。将多余的氧气嵌入$ o_i $原子中$ cuo_2 $ planes同样是$ hgba_2cuo_ {4+δ} $和氧气增强的bismuth cuprates。从氧气增强的$ la_2cuo_ {4+y} $中存在两个家庭的特征的组合。独立确认，使用通用型方法确定富含氧气富含氧的铜层的孔密度的有效性。除了引起不同类型的条纹外，两种类型的晶格缺氧还可能引起不同类型的超导性。这可以解释比$ sr $掺杂的酸奶油中含氧的$ t_ {c，max} $，以及以前家族中条纹衍射的X射线强度衍射的X射线强度的cus曲线。
Charge-order stripes of different types occur when copper oxides are doped with either heterovalent metal, like $La_{2-x}Sr_xCuO_4$, or oxygen, like $YBa_2Cu_3O_{6+y}$. The difference shows up in the doping dependence of their incommensurability: $q_c(x) \propto \sqrt{x-\check{p}}$ but $q_c(y) \approx 0.3$. The square-root dependence in the former compound family results from Coulomb repulsion between doped holes (or electrons), residing pairwise in lattice-site $O$ (or $Cu$) atoms of the $CuO_2$ planes. The almost constant $q_c(y)$ value in the second family results from the aggregation of ozone-like molecules, formed from $O^{2-}$ ions of the host with embedded oxygen atoms, $O_i$, at interstitial sites in the $CuO_2$ planes. The magnetic moments, $\mathbf{m}(O)$, of the lattice-defect $O$ atoms in the first family arrange antiferromagnetically, which gives rise to accompanying magnetization stripes of incommensurability $q_m(x) = q_c(x)/2$. The ozone complexes have a vanishing magnetic moment, $\mathbf{m}=0$, which explains the absence of accompanying magnetization stripes in the second family. Embedding excess oxygen as $O_i$ atoms in $CuO_2$ planes is likewise assumed for $HgBa_2CuO_{4+δ}$ and oxygen-enriched bismuth cuprates. A combination of characteristics from both families is present in oxygen-enriched $La_2CuO_{4+y}$. The validity of determining the hole density in oxygen-enriched cuprates with the universal-dome method is independently confirmed. Besides causing different types of stripes, the two types of lattice-defect oxygen may also cause different types of superconductivity. This could explain the much higher $T_{c,max}$ in oxygen-enriched than $Sr$-doped cuprates, as well as the cusped cooling-curves of X-ray intensity diffracted by stripes in the former family.
