论文标题
PR0.6SR0.4CO1-YGAYO3中磁化，磁倍率和磁性磁性的急剧步骤
Sharp steps in magnetization, magnetoresistance and magnetostriction in Pr0.6Sr0.4Co1-yGayO3
论文作者
论文摘要
我们报告了GA取代对多晶Pr0.6sr0.6sr0.4co1-ygayo3（y = 0.0-0.3）样品中磁化，磁化和磁磁的影响。在将非磁性GA3+阳离子取代磁CO3+时，低温的基态从铁磁金属的y = 0转变为y = 0.2的群集玻璃半导体。 7T处的磁势为负，其幅度从y = 0的2个百分比增加到10 k的y = 0.3的百分比。另一方面，在10 K时的磁截图为正，其值随着y的增加而降低。有趣的是，Y大于或等于0.2，在t小于或等于3 k时依赖磁场的磁化，磁化和磁磁体表现出正面和负磁场的可逆步骤，所有这些数量在所有这些磁场上都与4 k的磁场相差，而在所有三个不同的物理数量中，在perovsskite中均不在较早的磁场中，并且在perovs everities中均不同，它们在perovsskite coplitites中均不相差，它们在perovsskite中均不相差。合金。有人认为，铁磁簇的田间引起的雪崩翻转可能是所有这三个数量中观察到的步骤的起源。
We report the effect of Ga substitution on magnetization, magnetoresistance, and magnetostriction in polycrystalline Pr0.6Sr0.4Co1-yGayO3 (y=0.0-0.3) samples. Upon substitution of the non-magnetic Ga3+ cation for magnetic Co3+, the low-temperature ground state transforms from ferromagnetic metallic for y = 0 to cluster glass semiconductor for y = 0.2. Magnetoresistance at 7T is negative and its magnitude increases from 2 percentage for y = 0 to 30 percentage for y = 0.3 at 10 K. On the other hand, magnetostriction at 10 K is positive and its value decreases with increasing y. Interestingly, the field-dependent magnetization, magnetoresistance, and magnetostriction for y greater than or equal to 0.2 and at T less than or equal to 3 K show reversible abrupt steps for both positive and negative magnetic field whereas all these quantities vary smoothly with the magnetic field above 4 K. Such steps in all three distinct physical quantities were never reported earlier in perovskite cobaltites and they differ from observations made in manganites and intermetallic alloys. It is suggested that field-induced avalanche flipping of ferromagnetic clusters could be the origin of observed steps in all these three quantities.
