压力对（La $_{0.4}$ Pr $_{0.6}$）$_{1.2}$ Sr $_{1.8}$ Mn $_{2}$ O $_{7}$双层锰氧化物阶梯状磁致伸缩的影响
Effect of pressure on steplike magnetostriction of single crystalline (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ bilayered manganite
摘要：
报道了压力对双层锰氧化物（LaPr）1.2Sr1.8Mn2O8单晶阶跃磁致伸缩的影响，以了解场致一级相变的超尖锐性质。压力的施加抑制了阶跃式转变，并导致磁致伸缩的广泛变化。向晶体注入电流也减弱了磁致伸缩和磁阻的阶跃变化。外加压力或外加电流促进铁磁相互作用的稳定化或载流子的离域化，从而抑制台阶行为。我们的研究结果表明，台阶现象是密切相关的局域载流子的存在，如短程电荷轨道有序团簇。
英文摘要：
e report the effect of pressure on the steplike magnetostriction of single crystalline bilayered manganite (LaPr)1.2Sr1.8Mn2O8, for our understandings of the ultrasharp nature of the field-induced first-order transition from a paramagnetic insulator to a ferromagnetic metal phase. The application of pressure suppresses a steplike transformation and causes a broad change in the magnetostriction. The injection of an electric current to the crystal also weakens the steplike variation in both the magnetostriction and magnetoresistance. The stabilization of ferromagnetic interaction or the delocalization of charge carriers is promoted with the applied pressure or applied current, resulting in the suppressed steplike behavior. Our findings suggest that the step phenomenon is closely related to the existence of localized carriers such as the short-range charge-orbital ordered clusters.
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