High resolution neutron diffraction shows that the mesoscopic separation into ferromagnetic (FM) and antiferromagnetic (AFM) phases and the FM transition temperature T_C in the perovskite manganite (La_{1-y}Pr_{y})_{0.7}Ca_{0.3}MnO_3 strongly depend on the quenched correlated disorder. The different disorder strengths are achieved by different procedures of the sample synthesis and quantitatively characterized by the micro-strain-type diffraction peak broadening. The system shifts to predominantly one phase state with smaller T_C as the correlated disorder strength is decreased supporting the viewpoint that the origin of phase separation in the indicated manganite system is the correlated quenched disorder. The ground state of an ultimately chemically homogeneous sample is FM-like containing about 20% of the AFM minority phase. This FM-like state can be readily transformed to the AFM-like one having <20% of FM-phase by the decreasing of the effective charge carrier bandwidth via oxygen isotope substitution.
Electronic phase transitions in Pr$_{0.5}$Ca$_{0.5}$MnO$_3$ epitaxial thin films revealed by resonant soft x-ray scattering
研究了在（LaAl O $_3$）$_{0.3}$ -（SrAl $_{0.5}$ Ta $_{0.5}$ O $_3$）$_{0.7}$（LSAT）（011）$_c$上生长的Pr $_{0.5}$ Ca $_{0.5}$ MnO $_3$外延薄膜的磁性和轨道有序.在一个新的实验方法中，极化和能量依赖性的共振软X射线散射被用来揭示显着修改的磁序在膜相比，散装，即（i）不同的磁有序波矢量，（ii）不同的磁易轴和（iii）在低温下的额外的磁重排过渡。这些观察结果表明，强烈的影响的外延应变的自旋顺序，这是介导的轨道自由度，并提供了一个有前途的路线，以调整磁性能的锰氧化物薄膜。我们的研究结果进一步表明，共振软X射线散射是一个非常合适的技术来研究磁性的薄膜，中子散射不能很容易地应用于由于小的样品体积。
Strongly Quenched Kramers Doublet Magnetism in SmMgAl11O19
Charles University, Faculty of Mathematics and Physics（查理大学数学物理学院）；Adam Mickiewicz University, Faculty of Physics and Astronomy（亚当·密茨凯维奇大学物理与天文学学院）；Institute of Physics of the Czech Academy of Sciences（捷克科学院物理研究所）
Effect of oxygen isotope substitution and crystal micro-structure on magnetic ordering and phase separation in {$\rm (La_{1-y}Pr_{y})_{0.7}Ca_{0.3}MnO_3$}
Non percolative nature of the metal-insulator transition and persistence of local Jahn-Teller distortions in the rhombohedral regime of La$_{1-x}$Ca$_{x}$MnO$_{3}$
Exchange interactions and finite-temperature magnetism in (111)-oriented (LaMnO$_3$)$_{2n}$|(SrMnO$_3$)$_n$ superlattices
Institute of Physics, Nicolaus Copernicus University（尼古拉·哥白尼大学物理研究所）；School of Physics, Engineering and Technology, University of York（约克大学物理、工程与技术学院）；Department of Physics and Institute of Quantum Convergence and Technology, Kangwon National University（江原国立大学物理系及量子融合技术研究所）；Department of Energy Technology, Korea Institute of Energy Technology (KENTECH)（韩国能源技术研究院能源技术部）；Department of Physics and Astronomy, Uppsala University（乌普萨拉大学物理与天文系）
Magnetism in quasi-two-dimensional tri-layer La$_{2.1}$Sr$_{1.9}$Mn$_3$O$_{10}$ manganite
Ruddlesden-Popper（RP）系列三层结构的La $_{3-3x}$ Sr $_{1+3x}$ Mn $_{3}$ O $_{10}$锰氧化物是自然排列的层状结构，沿c轴方向交替堆叠m-MnO $_2$（m = 3）面和岩盐型块层（La，Sr）$_2$ O $_2$。RP系列锰氧化物的维数取决于钙钛矿层的数量，并显着影响系统的磁性和输运性质。三层结构的La $_{2.1}$ Sr $_{1.9}$ Mn $_{3}$ O $_{10}$表现出二级磁相变。研究了Ruddlesden-Popper系列锰氧化物的三层结构La $_{2.1}$ Sr $_{1.9}$ Mn $_{3}$ O $_{10}$在相变温度T $_C$附近的相变临界行为，以了解其低维磁性.我们确定了三层结构La $_{2.1}$ Sr $_{1.9}$ Mn $_{3}$ O $_{10}$的临界指数，它们属于短程二维Ising普适类.用重整化群方法解释了三层结构La $_{2.1}$ Sr $_{1.9}$ Mn $_{3}$ O $_{10}$锰氧化物的低维磁性。结果表明，$_{2.1}$ MnPDMATHABMO OPDMATHABMP的层状结构导致了三种不同类型的相互作用：面内（$ J_{ab} $）、三层内（$ J_{c} $）和三层间（$ J' $），其中$ J_{ab} $ $ J_{c…
Disorder-Induced Griffiths like Phase and Charge Localization in Sr2FeRuO6
South China University of Technology（华南理工大学）；Institute of Engineering and Management, Sector-V（维 sector 工程管理学院）；University of Engineering and Management, Newtown（纽敦工程与管理大学）；Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute（萨哈核物理研究所，霍米·巴巴国立学院成员机构）；Department of Physics, Aditya University（阿迪蒂亚大学物理系）
