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arXiv 0904.2635cond-mat.stat-mechcond-mat.str-el
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磁性玻璃中T $_g$随磁场的变化

Variation of T$_g$ with magnetic field in a magnetic glass

Archana Lakhani, Pallavi Kushwaha, R. Rawat, Kranti Kumar, A. Banerjee, P. Chaddah

摘要:

最近在各种磁性材料中报道了玻璃状逮捕。如在结构玻璃中,一级转变的动力学被阻止,同时保留较高熵相作为非遍历状态。我们显示了可视化的介观证据的不可逆失透的逮捕反铁磁绝缘相$Pr_{0.5}Ca_{0.5}Mn_{0.975}Al_{0.025}O_3$其平衡铁磁金属相的磁场的等温增加,类似于其等场失透变暖。半掺杂锰氧化物中$T_g$与磁场的斜率被证明具有由勒夏特列原理支配的符号。

英文摘要:

Glass-like arrest has recently been reported in various magnetic materials. As in structural glasses, the kinetics of a first-order transformation is arrested while retaining the higher-entropy phase as a non-ergodic state. We show visual mesoscopic evidence of the irreversible devitrification of the arrested antiferromagnetic-insulating phase in $Pr_{0.5}Ca_{0.5}Mn_{0.975}Al_{0.025}O_3$ to its equilibrium ferromagnetic-metallic phase with isothermal increase of magnetic field, similar to its iso-field devitrification on warming. The slope of $T_g$ vs magnetic field in half-doped manganites is shown to have a sign governed by Le Chatelier's Principle.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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