双层La[化学式：见原文]Sr[化学式：见原文]Mn[化学式：见原文]O[化学式：见原文]锰氧化物中具有不同普适类的多个磁相变。

Multiple magnetic phase transitions with different universality classes in bilayer La[Formula: see text]Sr[Formula: see text]Mn[Formula: see text]O[Formula: see text] manganite.

作者信息

Kumar Birendra, Tiwari Jeetendra Kumar, Chauhan Harish Chandr, Ghosh Subhasis

机构信息

School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067 India.

出版信息

Sci Rep. 2021 Oct 27;11(1):21184. doi: 10.1038/s41598-021-00544-8.

DOI:10.1038/s41598-021-00544-8

PMID:34707160

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8551313/

Abstract

Here, we report three magnetic transitions at 101 K (T[Formula: see text]), 246 K (T[Formula: see text]) and 295 K (T[Formula: see text]) in bilayer La[Formula: see text]Sr[Formula: see text]Mn[Formula: see text]O[Formula: see text]. The second order phase transitions have been identified at these transition points with the help of change in entropy analysis and modified Arrott plots (MAPs). The critical behavior around T[Formula: see text], T[Formula: see text] and T[Formula: see text] have been studied by MAPs and Kouvel-Fisher method. Based on these analyses four magnetic phases are: (1) 2D Ising ferromagnetic (FM) below T[Formula: see text],(2) 2D Heisenberg canted antiferromagnetic (CAFM-I) and FM clusters in temperature range T[Formula: see text] < T < T[Formula: see text], (3) 2D Heisenberg CAFM-II and FM clusters with non magnetically interacting planes in temperature range T[Formula: see text] < T < T[Formula: see text] and (4) paramagnetic for T > T[Formula: see text].

摘要

在此，我们报道了双层La₂Sr₁Mn₂O₇中在101 K（T₁）、246 K（T₂）和295 K（T₃）处的三个磁转变。借助熵变分析和修正的阿罗特图（MAPs），已在这些转变点确定了二级相变。通过MAPs和库维尔 - 费舍尔方法研究了T₁、T₂和T₃附近的临界行为。基于这些分析，四个磁相分别为：（1）低于T₁的二维伊辛铁磁体（FM）；（2）在T₁ < T < T₂温度范围内的二维海森堡倾斜反铁磁体（CAFM - I）和铁磁团簇；（3）在T₂ < T < T₃温度范围内具有非磁性相互作用平面的二维海森堡CAFM - II和铁磁团簇；以及（4）T > T₃时的顺磁体。