Dho Joonghoe, Kim W S, Hur N H
Center for CMR materials, Korea Research Institute of Standards and Science, Yusong P.O. Box 102, Taejon, 305-600 Korea.
Phys Rev Lett. 2002 Jul 8;89(2):027202. doi: 10.1103/PhysRevLett.89.027202. Epub 2002 Jun 20.
The magnetic and transport properties of the Cr-doped manganites La(0.46)Sr(0.54)Mn(1-y)Cr(y)O3 ( 0 < or = y < or = 0.08) with the A-type antiferromagnetic structure were investigated. Upon cooling, we find multiple magnetic phase transitions, i.e., paramagnetic, ferromagnetic (FM), antiferromagnetic (AFM), and spin glass in the y = 0.02 sample. The low temperature spin glass state is not a conventional spin glass with randomly oriented magnetic moments but has a reentrant character. The reentrant spin glass behavior accompanied by the anomalous multiple magnetic transitions might be due to the competing interactions between the FM phase and the A-type AFM matrix induced by the random Cr impurity.
研究了具有A - 型反铁磁结构的Cr掺杂锰酸盐La(0.46)Sr(0.54)Mn(1 - y)Cr(y)O3（0≤y≤0.08）的磁性和输运性质。冷却时，我们在y = 0.02的样品中发现了多个磁相变，即顺磁、铁磁（FM）、反铁磁（AFM）和自旋玻璃态。低温自旋玻璃态不是具有随机取向磁矩的传统自旋玻璃，而是具有重入特性。伴随着异常多磁相变的重入自旋玻璃行为可能是由于随机Cr杂质诱导的FM相和A - 型AFM基体之间的竞争相互作用所致。
