Isotope shift of the ferromagnetic transition temperature in itinerant ferromagnets

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• 作者：Takashi Yanagisawa ; ^{t-yanagisawa@aist.go.jp} ; Izumi Hase ; Kosuke Odagiri
• 关键词：Itinerant ferromagnet ; Isotope effect ; Hubbard model ; Electron&ndash ; phonon interaction ; Vertex correction ; Spin-fluctuation theory
• 刊名：Physics Letters A
• 出版年：2017
• 出版时间：19 February 2017
• 年：2017
• 卷：381
• 期：7
• 页码：737-741
• 全文大小：332 K
• 卷排序：381

文摘

We investigate the isotope effect of the Curie temperature TcTc in itinerant ferromagnets. It is important to determine the sign of the shift of TcTc for isotope substitution. The isotope effect in ferromagnetic materials occurs through the electron–phonon vertex correction. The decrease of the Debye frequency increases the relative strength of the Coulomb interaction leading to a positive isotope shift of TcTc. Recent experiment on the isotope effect in SrRuO3 is consistent with our theory.