Contrasting the magnetic response between magnetic-glass and reentrant spin-glass
S. B. Roy, M. K. Chattopadhyay
备注：
10 pages and 4 figures. The preprint has been amended after taking care of various typographical errors, some errors in Figs.2 and 4 and with the addition of some new references. This version has been accepted for publication in Physical Review B
Magnetic-glass is a recently identified phenomenon in various classes of magnetic systems undergoing a first order magnetic phase transition. We shall highlight here a few experimentally determined characteristics of magnetic-glass and the relevant set of experiments, which will enable to distinguish a magnetic-glass unequivocally from the well known phenomena of spin-glass and reentrant spin-glass.
We study the evolution of the low-temperature field-induced magnetic defects observed under an applied magnetic field in a series of frustrated amorphous ferromagnets (Fe$_{1-x}$Mn$_{x}$)$_{75}$P$_{16}$B$_{3}$Al$_{3}$ (a-FeMn). Combining small-angle neutron scattering and Monte Carlo simulations, we show that the morphology of these defects resemble that of quasi-bidimensional spin vortices. They are observed in the reentrant spin-glass (RSG) phase, up to the critical concentration $x_{\rm C} \approx 0.36$ which separates the RSG and "true" spin glass (SG) within the low temperature part of th…
Evidence for reentrant quantum paraelectric state preceded by a multiglass phase with non-classical exponent and magnetodielectric coupling in SrFe12O19
The zero-field-cooled exchange bias (ZEB) effect is a remarkable phenomenon recently reported for some reentrant spin glass-like compounds. In this work, the time-evolution of magnetization is thoroughly investigated for two ZEB materials in order to figure out the role played by the spin glass-like phase on such effect. La$_{1.5}$Sr$_{0.5}$CoMnO$_{6}$ and La$_{1.5}$Ca$_{0.5}$CoMnO$_{6}$ were chosen as representative samples of ZEB systems, since the former compound presents the largest ZEB reported so far, while the second has a much smaller effect, despite being structurally/chemically simil…
Conversion of glassy antiferromagnetic-insulating phase to equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr${_{0.5}}$Ca$_{0.5}$MnO${_3}$
结果表明，Pr ${_{0.5}}$ Ca $_{0.5}$ MnO ${_3}$和La ${_{0.5}}$ Ca $_{0.5}$ MnO ${_3}$（LCMO）在低温下表现出定性相似且明显异常的M-H曲线。在磁场作用下，两种材料都发生了一个宽的一阶不可逆的反铁磁（AF）-绝缘（I）-铁磁（FM）-金属（M）相变，并产生了软FM态。而Pr $_{0.5}$ Ca $_{0.5}$ Mn $_{0.975}$ Al $_{0.025}$ O $_3$（PCMAO）的低温平衡态为FM-M，而LCMO的低温平衡态为AF-I。在这两个系统中，各自的平衡相共存的另一个阶段与相反的顺序，这是不平衡的，和冷却场可以调整的分数共存相。它表明较早的共存FM-M相的行为像“磁性玻璃”在LCMO。在这里，我们表明，从专门设计的测量协议的AF-I相的PCMAO具有磁性玻璃态的所有特征。它在加热时失透，并且在退火后再结晶为平衡FM-M相。这种玻璃状的AF-I相也显示出类似的有趣的功能，观察到在FM-M磁性玻璃态的LCMO，当开始共存的玻璃分数较大，连续退火的结果在较大的平衡相的分数。两个锰氧化物系统之间的这种相似性，与各自的玻璃相和平衡相的对比磁顺序指向一个可能的普遍性。
An effort is made to study the contrast in magnetic behavior resulting from minimal disorder introduced by substitution of 2.5% Ga or Al in Mn-site of La${_{0.9}}$Sr$_{0.1}$MnO${_3}$. It is considered that Ga or Al selectively creates disorder within the orbital domains or on its walls, causing enhancement of Griffiths phase (GP) singularity for the former and disappearance of it in the later case. It is shown that Ga replaces Mn$^{3+}$ which is considered to be concentrated within the domains, whereas Al replaces Mn$^{4+}$ which is segregated on the hole-rich walls, without causing any signif…
Disproportionate influence of site disorder on the evolution of magnetic phases in anti-Heusler alloy Al$_2$MnFe
Saha Institute of Nuclear Physics（萨哈核物理研究所）；Homi Bhabha National Institute（霍米·巴巴国立研究所）；Maulana Azad National Institute of Technology（莫拉纳·阿扎德国立理工学院）；Indian Institute of Science Education and Research (IISER) Pune（印度科学教育研究学院（普纳））；UGC-DAE Consortium for Scientific Research（UGC-DAE科学研究联盟）
Metal thio(seleno)phosphates MPX$_3$ have attracted considerable attentions with wide spanned band gaps and rich magnetic properties. In this series, two neighboring members MnPS$_3$ and NiPS$_3$ differ in magnetic atoms, magnetic easy axes, spin anisotropy, as well as nearest-neighbor magnetic interactions. The competition between these components may cause intriguing physical phenomena. In this article, the evolution of magnetism of Mn$_{1-x}$Ni$_x$PS$_3$ series is reported. Despite the incompatible antiferromagnetic orders of two end members, the antiferromagnetism persists as the ground st…
A systematic study using neutron diffraction and magnetic susceptibility are reported on Mn substituted ferrimagnetic inverse spinel Ti$_{1-x}$Mn$_{x}$Co$_2$O$_4$ in the temperature interval 1.6 K $\leq$ $T$ $\leq$ 300 K. Our neutron diffraction study reveals cooperative distortions of the $T$O$_6$ octahedral for all the Jahn-Teller active ions $T$ = Mn$^{3+}$, Ti$^{3+}$ and Co$^{3+}$, which are confirmed by the X-ray photoelectron spectroscopy. Two specific compositions ($x$ = 0.2 and 0.4) have been chosen because of their unique features: noncollinear Yafet-Kittel type ordering, and weak tet…
