We report that the spin-chain compound Dy2BaNiO5 recently proven to exhibit magnetoelectric coupling below its Neel temperature (T_N) of 58 K, exhibits strong frequency-dependent behavior in ac magnetic susceptibility and complex dielectric properties at low temperatures (<10K), mimicking 'reentrant' multiglass phenomenon. Such a behavior is not known among undoped compounds. A new finding in the field of multiferroics is that the characteristic magnetic feature at such low temperatures moves towards higher temperatures in the presence of a magnetic-field (H), whereas the corresponding dielectric feature shifts towards lower temperatures with H, unlike the situation near T_N. This observation indicates that the alignment of spins by external magnetic fields tends to inhibit glassy-like slow electric-dipole dynamics, at least in this system, possibly arising from peculiarities in the magnetic structure.
Low temperature dielectric anomalies in HoMnO_3: The complex phase diagram
在低温（1.8 K< T <10 K）和外加磁场作用下，多铁性六方HoMnO_3的介电常数呈现出前所未有的异常多样性，这与Ho磁矩、Mn自旋和铁电极化耦合系统中的磁相变有关.推导出的相图是复杂得多，比以前假设的，包括重入相，相变与不同的热和场滞后，以及几个多临界点。磁弹性相互作用在磁相变处引入晶格异常。对HoMnO_3的T-H相图的重新评价是必要的。
A chemical avenue to manipulate field-reentrant superconducting rivalries in infinite layer nickelates
University of Science and Technology Beijing（北京科技大学）；Beijing Normal University（北京师范大学）；Anhui University（安徽大学）；Center for High Pressure Science and Technology Advanced Research（高压科学与技术先进研究中心）；Institute for Shanghai Advanced Research in Physical Sciences (SHARPS)（上海物理科学前沿研究院）；Chinese Academy of Sciences（中国科学院）；North China Electric Power University（华北电力大学）；East China Normal University（华东师范大学）；PSI Center for Neutron and Muon Sciences（瑞士保罗谢勒研究所中子与缪子科学中心）
Evidence for reentrant quantum paraelectric state preceded by a multiglass phase with non-classical exponent and magnetodielectric coupling in SrFe12O19
Magnetic and electric behaviors of DyMn$_2$O$_5$: effect of hole doping
DyMn $_2$ O $_5$是一种有趣的多铁性材料，具有多种磁、电和结构转变。本文通过磁性和介电测量系统地研究了Sr掺杂对DyMn $_2$ O $_5$中Dy位的影响。在Dy位点处掺杂二价Sr预期提高Mn $^{4+}$：Mn $^{3+}$比率，并且其还将稀释Dy位点。我们的研究表明，在接近43 K，我们认为这是与增加的铁磁相关Sr掺杂的磁异常的大增强。在3 K的矫顽场的逐渐增加与Sr掺杂和相邻的Mn $^{4+}$离子的键长的减少进一步支持系统中的铁磁相关性的增强。母体样品在12 K附近表现出较大的磁热效应，其幅度随着Sr浓度的增加而减小。掺杂还增强了在介电常数与温度数据中观察到的在28 K左右的异常，并且这种异常早先被认为与自旋重取向以及从一种铁电状态到另一种铁电状态的同时转变有关。发现在25 K以下观察到的电有序对外加磁场敏感，并支持Ratcliff II { \it et al.}（Phys. Rev. B { \bf 72}，060407（R）（2005））中描述了与多个电跃迁相关联的磁结构中的伴随变化。
Successive magnetic transitions and multiferroicity in layered honeycomb BiCrTeO$_{6}$
University of Groningen（格罗宁根大学）；National Sun Yat-sen University（国立中山大学）；Sungkyunkwan University（成均馆大学）；National Synchrotron Radiation Research Center（国家同步辐射研究中心）；National Yang Ming Chiao Tung University（国立阳明交通大学）
Intra pseudogap- and superconductivity-pair spin and charge fluctuations and underdome metal-insulator (fermion-boson)-crossover phenomena as keystones of cuprate physics
