Maximilian Kai Reimann, Wilma Pröbsting, Theresa Block, Rainer Pöttgen
{"title":"Gadolinium spin dilution in the ferromagnetic solid solutions Gd2–x Y x Cu2Mg","authors":"Maximilian Kai Reimann, Wilma Pröbsting, Theresa Block, Rainer Pöttgen","doi":"10.1515/znb-2024-0029","DOIUrl":null,"url":null,"abstract":"Samples of the solid solution Gd<jats:sub>2–<jats:italic>x</jats:italic> </jats:sub>Y<jats:sub> <jats:italic>x</jats:italic> </jats:sub>Cu<jats:sub>2</jats:sub>Mg (in steps of <jats:italic>x</jats:italic> = 0.2) were synthesized from the elements in sealed tantalum ampoules in a high-frequency furnace. The polycrystalline samples were characterized by X-ray powder diffraction. The structure of Gd<jats:sub>0.988(6)</jats:sub>Y<jats:sub>1.012(6)</jats:sub>Cu<jats:sub>2</jats:sub>Mg was refined from single-crystal X-ray diffractometer data: Mo<jats:sub>2</jats:sub>B<jats:sub>2</jats:sub>Fe type, <jats:italic>P</jats:italic>4/<jats:italic>mbm</jats:italic>, <jats:italic>a</jats:italic> = 762.83(4), <jats:italic>c</jats:italic> = 375.48(2) pm, w<jats:italic>R</jats:italic>2 = 0.0277, 285 <jats:italic>F</jats:italic> <jats:sup>2</jats:sup> values and 13 variables. Single-crystal data gave no hint for Gd/Y ordering. All samples behave like Curie-Weiss paramagnets with stable trivalent gadolinium and ferromagnetic ordering at low temperature. Within the solid solution the Curie temperature drops almost linearly from <jats:italic>T</jats:italic> <jats:sub>C</jats:sub> = 113.5(1) K for Gd<jats:sub>2</jats:sub>Cu<jats:sub>2</jats:sub>Mg to 9.3(1) K for Gd<jats:sub>0.2</jats:sub>Y<jats:sub>1.8</jats:sub>Cu<jats:sub>2</jats:sub>Mg, allowing a precise adjustment of the magnetic ordering temperature through gadolinium spin dilution.","PeriodicalId":23831,"journal":{"name":"Zeitschrift für Naturforschung B","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zeitschrift für Naturforschung B","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1515/znb-2024-0029","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Samples of the solid solution Gd2–xYxCu2Mg (in steps of x = 0.2) were synthesized from the elements in sealed tantalum ampoules in a high-frequency furnace. The polycrystalline samples were characterized by X-ray powder diffraction. The structure of Gd0.988(6)Y1.012(6)Cu2Mg was refined from single-crystal X-ray diffractometer data: Mo2B2Fe type, P4/mbm, a = 762.83(4), c = 375.48(2) pm, wR2 = 0.0277, 285 F2 values and 13 variables. Single-crystal data gave no hint for Gd/Y ordering. All samples behave like Curie-Weiss paramagnets with stable trivalent gadolinium and ferromagnetic ordering at low temperature. Within the solid solution the Curie temperature drops almost linearly from TC = 113.5(1) K for Gd2Cu2Mg to 9.3(1) K for Gd0.2Y1.8Cu2Mg, allowing a precise adjustment of the magnetic ordering temperature through gadolinium spin dilution.
固溶体 Gd2-x Y x Cu2Mg 样品（以 x = 0.2 为步长）是在高频炉中从密封的钽安瓿瓶中的元素合成的。通过 X 射线粉末衍射对多晶样品进行了表征。Gd0.988(6)Y1.012(6)Cu2Mg 的结构是从单晶 X 射线衍射仪数据中提炼出来的：Mo2B2Fe 型，P4/mbm，a = 762.83(4)，c = 375.48(2) pm，wR2 = 0.0277，285 F 2 值和 13 个变量。单晶数据没有提示 Gd/Y 排序。所有样品在低温下都表现为具有稳定三价钆和铁磁有序性的居里-魏斯顺磁体。在固溶体中，居里温度从 Gd2Cu2Mg 的 T C = 113.5(1) K 几乎线性下降到 Gd0.2Y1.8Cu2Mg 的 9.3(1) K，从而可以通过钆自旋稀释精确调节磁有序温度。
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