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arXiv 1111.6368cond-mat.str-el
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Tb5-xLuxSi3(x <= 0.7)合金中磁相共存亚稳相的演化及其对磁场循环的异常敏感性

Evolution of a metastable phase with a magnetic phase coexistence phenomenon and its unusual sensitivity to magnetic field cycling in the alloys Tb5-xLuxSi3 (x <= 0.7)

K. Mukherjee, Kartik K. Iyer, E. V. Sampathkumaran

摘要:

最近,我们报道了一个异常增强的正磁阻超过临界磁场在Tb 5Si 3的磁有序状态,归因于“逆变磁性”。这导致不寻常的磁滞回线的加压标本,这是有关的主题“电子相分离”。在本文中,我们报告的影响,小取代的Lu的Tb,显示这些磁异常的演变。我们发现,在低温下,高场高电阻率相可以部分稳定的磁场返回到零,在许多这些Lu取代合金,通过电阻率(ρ)测量。此外,该相和原始相的相对分数似乎通过对组成和温度的小调整来控制。有趣的是,在1.8 K下,在几个场循环后,在低场下观察到该混合相的ρ值与某些组合物的原始相的ρ值的突然“切换”,表明该混合相的亚稳性。

英文摘要:

Recently, we reported an anomalous enhancement of the positive magnetoresistance beyond a critical magnetic field in Tb5Si3 in the magnetically ordered state, attributable to 'inverse metamagnetism'. This results in unusual magnetic hysteresis loops for the pressurized specimens, which are relevant to the topic of 'electronic phase separation'. In this paper, we report the influence of small substitutions of Lu for Tb, to show the evolution of these magnetic anomalies. We find that, at low temperatures, the high-field high-resistivity phase could be partially stabilized on returning the magnetic field to zero in many of these Lu substituted alloys, as measured through the electrical resistivity (ρ). Also, the relative fractions of this phase and the virgin phase appear to be controlled by a small tuning of the composition and temperature. Interestingly, at 1.8 K a sudden 'switch-over' of the value of ρ for this mixed phase to that for the virgin phase for some compositions is observed at low fields after a few field cycles, indicating metastability of this mixed phase.

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