We report magnetization measurements on samples of La_0.85Ga_0.15FeAsO in the wide temperature range of 10 K-400 K, up to the field of 90 kOe having been prepared by solid-state reaction. This novel compound crystallizes with the tetragonal ZrCuSiAs-type structure. The crystal structure was determined by X-ray powder diffraction (P4/nmm: a = 4.032 Å, and c = 8.741 Å).

Temperature dependence of magnetization for this compound is measured with zero-field cooling (ZFC) and field cooling (FC) with an application of H = 50 Oe. The large bifurcation between the ZFC and FC curves has been observed starting at around 370 K. At lower temperatures below $T_{sc}^{set-on}$ $\sim$37 K, superconductivity and magnetism coexist. Intermediate temperature range (37 K< T < 300 K), the sample is in a mixed state of the ferromagnetic clusters with paramagnetic moments, described well by the Modified Curie Weiss expression. At higher temperatures above 360 K, it is a pure paramagnetic, described perfectly by the simple Curie-Weiss expression.

The natures of the superconducting flux-pinning centers are revealed based on analysis of the pinning force, F_pin at T = 10 K. The normalized pinning force, F_p/F_{p, max} versus H indicates the filamentary character owing to the pinning parameters, p = 0.5, q = 2. These results point out that, in the superconductivity, the dominance of grain boundary with single-vortex pinning (μ =1/7) mechanism

The Curie temperature, T_curie was estimated using the modified Arrot plots. The critical exponents, β, ϒ, and δ were estimated, and their values are in close agreement with those predicted for a mean-field-like behavior at a magnetic phase transition.

_{我们报告了在 10 K-400 K 的宽温度范围内对 La 0.85} Ga _0.15 FeAsO样品进行的磁化测量，通过固态反应制备了高达 90 kOe 的磁场。这种新型化合物以四方 ZrCuSiAs 型结构结晶。晶体结构由 X 射线粉末衍射测定（P4/nmm：a  = 4.032 Å，c  = 8.741 Å）。

该化合物的磁化温度依赖性通过零场冷却 (ZFC) 和场冷却 (FC) 以及H  = 50 Oe 的应用来测量。从大约 370 K 开始观察到 ZFC 和 FC 曲线之间的大分岔。在低于${吨}_{sC}^{se吨-○n}$ $～$37 K，超导和磁共存。中间温度范围（37 K < T < 300 K），样品处于具有顺磁矩的铁磁团簇的混合状态，由修正的居里魏斯表达式很好地描述。在高于 360 K 的较高温度下，它是纯顺磁性的，由简单的居里-魏斯表达式完美描述。

基于对T = 10 K 时的钉扎力 F _pin的分析揭示了超导通量钉扎中心的性质 。归一化钉扎力 F _p /F _{p 最大}与 H 的关系表明由于钉扎参数而导致的丝状特征, p  = 0.5, q  = 2。这些结果表明，在超导中，单涡钉扎（μ =1/7）机制的晶界占主导地位

使用修改后的 Arrot 图估计居里温度 T_居里。估计了临界指数 β、ϒ 和 δ，它们的值与磁相变中的平均场样行为的预测值非常一致。