Hole doped transition metal oxides are famous due to their extraordinary charge transport properties, such as high temperature superconductivity (cuprates) and colossal magnetoresistance (manganites). Astonishing, the mother system of these compounds is a Mott insulator, whereas important role in the establishment of the metallic or superconducting state is played by the way that holes are self-organized with doping. Experiments have shown that by adding holes the insulating phase breaks into antiferromagnetic (AFM) regions, which are separated by hole rich clumps (stripes) with a rapid change of the phase of the background spins and orbitals. However, recent experiments in overdoped manganites of the La(1-x)Ca(x)MnO(3) (LCMO) family have shown that instead of charge stripes, charge in these systems is organized in a uniform charge density wave (CDW). Besides, recent theoretical works predicted that the ground state is inhomogeneously modulated by orbital and charge solitons, i.e. narrow regions carrying charge (+/-)e/2, where the orbital arrangement varies very rapidly. So far, this has been only a theoretical prediction. Here, by using 139La Nuclear Magnetic Resonance (NMR) we provide direct evidence that the ground state of overdoped LCMO is indeed solitonic. By lowering temperature the narrow NMR spectra observed in the AFM phase are shown to wipe out, while for T<30K a very broad spectrum reappears, characteristic of an incommensurate (IC) charge and spin modulation. Remarkably, by further decreasing temperature, a relatively narrow feature emerges from the broad IC NMR signal, manifesting the formation of a solitonic modulation as T->0.
Phase separation and the possibility of orbital liquid states in CMR manganites. A 139La NMR study
139 La NMR自旋-晶格弛豫速率1/T1和射频增强实验提供的证据表明，低温制度的铁磁（FM）相的La 1-xCaxMnO 3隔离成高导电性和导电性差的FM区域，与轨道结构的差异。值得注意的是，相分离伴随着一个额外的NMR信号的外观从FM区域与消失的小磁各向异性。这一特征被归因于具有强烈轨道波动的区域的出现，类似于不均匀FM矩阵内的轨道液体的液滴。
Magnetic and orbital order in overdoped bilayer manganites
在掺杂区$0.5 < x <1.0$的双层锰氧化物的磁性和轨道的顺序已经从一个模型，该模型包括两个$e_g$轨道在每个Mn站点，轨道间的库仑相互作用和晶格畸变进行了研究。通常的双交换通过$e_g$轨道进行。它示出，这样的模型再现最近获得的双层系统在此范围内的掺杂的相图。由Ling等人看到的具有（$π,0,π$）自旋序的C型相似乎是分层几何结构的自然结果，并且通过系统的静态畸变而稳定。的轨道顺序示出驱动磁顺序，而各向异性跳跃的$e_g$轨道，分层的基本结构和相关的静态失真的性质在很大程度上决定了轨道安排。
Phase Separation in A-site Ordered Perovskite Manganite LaBaMn$_2$O$_6$ Probed by $^{139}$La and $^{55}$Mn NMR
$^{139}$ La-和$^{55}$ Mn-NMR谱表明，A位有序钙钛矿锰氧化物LaBaMn $_2$ O $_6$的基态是铁磁（FM）和反铁磁（AFI（CE））区域的空间混合物，这分别被分配给金属和绝缘电荷有序状态。这种奇异的共存状态出现在200 K以下，通过一个一阶类似的形成的AFI（CE）状态内的FM之一。Mn自旋-自旋弛豫速率表明，$_2$中与AFI（CE）区共存的FM区与无序形式La $_{0.5}$ Ba $_{0.5}$ MnOPDMATHABMR的体FM相相同，尽管没有A位无序.这表明LaBaMn $_2$ O $_6$中FM区的介观性质而不是纳米性质。
75As NMR study of single crystals of the heavily overdoped pnictide superconductors Ba{1-x}KxFe2As2 (x = 0.7 and 1)
我们对两种高质量的过掺杂Ba $_{1-x}$ K $_{x}$ Fe $_2$ As $_2$（x=0.7和1.0）单晶进行了$^{75}$ As NMR研究。在正常状态下，我们发现自旋晶格弛豫（$1/^{75}T_1$）从x=0.7到x=1.0的样品急剧增加。在KFe $_2$ As $_2$中，$1/^{75}T_1TK_n^2$的比率（其中$^{75}K_n$是奈特位移）随着温度降低而增加。这些结果表明，通常被当作简单费米液体的KFe $_2$ As $_2$中存在一种新的自旋涨落.在超导状态下，我们观察到一个阶梯状的功能在x=0.7样品的自旋晶格弛豫的温度依赖性，这支持一个两个间隙的超导低掺杂材料。然而，$1/^{75}T_1$在过掺杂样品中低于Tc的温度标度与在欠掺杂或最佳掺杂的样品中的温度标度显著不同。观察到了幂律标度行为$1/^{75}T_1T\sim T^{0.5}$，这表明在过掺杂空穴型超导体中普遍存在较强的低能激发。
NMR Studies of pseudogap and electronic inhomogeneity in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$
本文报道了过掺杂Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8+δ}$和$T_c=82$ K单晶的$^{17}$ O NMR测量结果。我们测量了平面氧奈特位移、电场梯度和自旋晶格弛豫速率张量的全各向异性，并表明整个温度依赖性是由低于$T^*\sim 94$ K的赝能隙中的态密度的抑制决定的。的线宽可以解释由磁和四极加宽的组合，作为一个不均匀的分布的局部空穴浓度的结果，这是一致的扫描隧道显微镜测量。该分布与温度无关，不会破坏$C_4$对称性，并且在低于$T^*$或$T_c$时没有变化。
Site-selective $^{63}$Cu NMR study of the vortex cores of Tl$_{2}$Ba$_{2}$CuO$_{6+δ}$
本文报道了在$T_{c}$ = 85 K下对过掺杂TlPDMATHABMN Ba $_{2}$ CuO $_{6+δ}$的涡旋芯态的择位$^{63}$ Cu NMR研究。我们观察到一个相对较高的密度的低能量准粒子激发的涡核中的磁场为7.4847 T沿c轴，相比之下，YBa $_{2}$铜$_{3}$ O $_{7-δ}$。
