...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Phase coexistence and magnetic anisotropy in La_(1-x)Ca_xMnO_3 (0 < x ≤ 0.23) studied via electron spin resonance
【24h】

Phase coexistence and magnetic anisotropy in La_(1-x)Ca_xMnO_3 (0 < x ≤ 0.23) studied via electron spin resonance

机译：通过电子自旋共振研究La_（1-x）Ca_xMnO_3（0

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 report an electron-spin-resonance (ESR) study of stoichiometric La_(1-x)Ca_xMnO_3 for 0 < x ≤ 0.23. The room-temperature ESR linewidth shows a marked decrease with x that is mainly due to the variation of the magnetic susceptibility and a much slower evolution of spin relaxation, associated with the interplay of crystal-field and superexchange interactions. In the canted antiferromagnetic regime, the ESR parameters show initially an x-dependent ferromagnetic (FM) behavior that evolves to antiferromagnetic in the vicinity of T_N, reflecting the development of spin canting. A weak ferromagnetic-resonance (FMR) mode is observed below T_N that becomes enhanced near the phase boundary to the ferromagnetic insulating (FMI) phase. This mode persists at higher doping levels ( x ≤ 0.16) and is attributed to residual FM domains due to the release of crystal strain near the structural transformation at T < 100 K. In the FMI regime, FMR measurements show strong uniaxial magnetic anisotropy up to x=0.16 with K=(1-2) X 10~6 erg/cm~3 at 100 K. The temperature dependence of the magnetic anisotropy reveals power-law scaling with the magnetization, K(T)∝M(T)~3, indicative of single-ion magnetocrystalline anisotropy and the persistence of orbital order in the FMI state. As the FM metallic phase is approached, the magnetic anisotropy decreases significantly and an additional FMR mode systematically emerges in the paramagnetic regime at T approx < 260 K for x=0.19-0.23. Its relative spectral weight grows with x indicating an increase of the underlying FM fraction that correlates with the enhanced metallic behavior.
机译：我们报告了化学计量La_（1-x）Ca_xMnO_3对于0

著录项

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