Magnetic Properties of La0.81Sr0.19Mn0.9Fe0.1−xZnxO3 (x = 0, x = 0.05)

IF 1.1 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Applied Magnetic Resonance Pub Date : 2022-11-07 DOI:10.1007/s00723-022-01510-x

R. M. Eremina, I. V. Yatsyk, Z. Y. Seidov, F. G. Vagizov, V. A. Shustov, A. G. Badelin, V. K. Karpasyuk, D. S. Abdinov, M. M. Tagiev, S. Kh. Estemirova, H.-A. Krug von Nidda

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引用次数: 0

Abstract

Magnetic properties of polycrystalline La_0.81Sr_0.19Mn_0.9Fe_0.1−xZn_xO₃ (x = 0, 0.05) have been investigated by means of electron spin resonance, magnetic susceptibility, and Mössbauer measurements. Both samples show a clear ferromagnetic transition. The Curie temperature T_C decreases on increasing Fe content (x = 0.05—T_C = 222 K; x = 0—T_C = 148 K). Mössbauer studies indicate that Fe in these compounds is in the trivalent high-spin state. The temperature evolution of the Mössbauer spectra at low temperatures (T < T_C) is typical for ferromagnetic clusters with a wide distribution in size and magnetic correlation length. The inverse susceptibility of all the samples deviates from the Curie–Weiss law above T_C, indicating the presence of fluctuations on approaching magnetic order. An anomalous downturn of the inverse susceptibility for x = 0.05 significantly above T_C and the concomitant observation of ferromagnetic resonance signals coexisting with the paramagnetic resonance up to approximately room temperature, is caused by a Griffiths-like behavior. This regime is characterized by the coexistence of ferromagnetic entities within the globally paramagnetic phase.

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La0.81Sr0.19Mn0.9Fe0.1−xZnxO3的磁性能(x = 0, x = 0.05)

用电子自旋共振、磁化率和Mössbauer测量等方法研究了La0.81Sr0.19Mn0.9Fe0.1−xZnxO3 (x = 0,0.05)的磁性能。两种样品均表现出明显的铁磁转变。居里温度TC随Fe含量的增加而降低(x = 0.05-TC = 222 K;x = 0-TC = 148 K). Mössbauer研究表明，这些化合物中的铁处于三价高自旋态。Mössbauer光谱在低温(T < TC)下的温度演化是铁磁团簇尺寸和磁相关长度分布广泛的典型特征。所有样品的磁化率逆均偏离TC以上的居里-魏斯定律，表明在接近磁阶时存在波动。当x = 0.05显著高于TC时，磁化率逆异常下降，并伴随观察到铁磁共振信号与顺磁共振共存，直至大约室温，这是由Griffiths-like行为引起的。这种状态的特点是在全局顺磁相内存在铁磁实体。

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来源期刊

Applied Magnetic Resonance 物理-光谱学

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

2.3 months

期刊介绍： Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.