...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Complex exchange mechanism driven ferromagnetism in half-metallic Heusler Co_2TiGe: Evidence from critical behavior
【24h】

Complex exchange mechanism driven ferromagnetism in half-metallic Heusler Co_2TiGe: Evidence from critical behavior

机译：半金属Heusler Co_2TiGe中复杂的交换机制驱动的铁磁性：来自临界行为的证据

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have investigated the critical phenomenon associated with the magnetic phase transition in the half-metallic full-Heusler Co2TiGe. The compound undergoes a continuous paramagnetic-to-ferromagnetic phase transition below the Curie temperature T-C = 371.5 K. The analysis of magnetization isotherms in the vicinity of T-C, following a modified Arrott plot method, the Kouvel-Fisher technique, and a critical isotherm plot, yields the asymptotic critical exponents beta = 0.495, gamma = 1.324, and delta = 3.67. The self-consistency and reliability of the obtained exponents are further verified by the Widom scaling relation and scaling equations of state. The mean-field-like value of the critical exponent beta suggests a long-range nature of the exchange interactions, whereas the values of the critical exponents gamma and delta imply sizable critical spin fluctuations. The half-metallic itinerant character of Co2TiGe in the presence of magnetic inhomogeneity may result in such a strong deviation from the three-dimensional Heisenberg values (beta = 0.369, gamma = 1.38, and delta = 4.8) of the critical exponents toward the mean-field values (beta = 0.5, gamma = 1, and delta = 3). The results suggest the complex nature of exchange couplings that stabilize the long-range ferromagnetic ordering in the system and are consistent with the earlier theoretical studies on the exchange mechanism in Co2TiGe.
机译：我们研究了与半金属全Heusler Co2TiGe中的磁性相变有关的临界现象。在居里温度TC = 371.5 K以下，该化合物经历了顺磁至铁磁的连续相变。采用改进的Arrott图法，Kouvel-Fisher技术和临界等温线图，分析了TC附近的磁化等温线。 ，得出渐近临界指数β= 0.495，γ= 1.324，Δ= 3.67。 Widom比例关系和状态比例方程进一步验证了所获得指数的自洽性和可靠性。临界指数β的类似平均场的值表明了交换相互作用的远距离性质，而临界指数γ和δ的值意味着相当大的临界自旋波动。在磁性不均一的情况下，Co2TiGe的半金属流动特征可能会导致与临界指数的三维Heisenberg值（β= 0.369，γ= 1.38和delta = 4.8）产生如此大的偏差，即-字段值（beta = 0.5，gamma = 1和delta = 3）。结果表明，交换耦合的复杂性质稳定了系统中的远距离铁磁有序性，并且与早期有关Co2TiGe交换机理的理论研究相一致。

著录项

  • 来源
    《Physical review》 |2019年第21期|214414.1-214414.8|共8页
  • 作者

    Roy Shubhankar; Khan Nazir; Singha Ratnadwip; Pariari Arnab; Mandal Prabhat;

  • 作者单位

    HBNI, Saha Inst Nucl Phys, 1-AF Bidhannagar, Kolkata 700064, India|Vidyasagar Evening Coll, 39 Sankar Ghosh Lane, Kolkata 700006, India;

    HBNI, Saha Inst Nucl Phys, 1-AF Bidhannagar, Kolkata 700064, India;

    HBNI, Saha Inst Nucl Phys, 1-AF Bidhannagar, Kolkata 700064, India;

    HBNI, Saha Inst Nucl Phys, 1-AF Bidhannagar, Kolkata 700064, India;

    HBNI, Saha Inst Nucl Phys, 1-AF Bidhannagar, Kolkata 700064, India;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号