Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr₁₋_xLa_xRuO₃

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Ikuto Kawasaki¹^,, Makoto Yokoyama²^,, Suguru Nakano², Kenji Fujimura², Naoaki Netsu², Hirofumi Kawanaka³, and Kenichi Tenya⁴

+ Affiliations

¹Advanced Meson Science Laboratory, RIKEN Nishina Center for Accelerator Based Science, RIKEN, Wako, Saitama 351-0198, Japan²Faculty of Science, Ibaraki University, Mito 310-8512, Japan³National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan⁴Faculty of Education, Shinshu University, Nagano 390-8621, Japan

Received January 24, 2014; Accepted April 17, 2014; Published May 28, 2014

The magnetic and electronic properties of Sr₁₋_xLa_xRuO₃ were studied by means of dc-magnetization, ac-susceptibility, specific heat, and electrical resistivity measurements. The dc-magnetization and ac-susceptibility measurements have revealed that the transition temperature and the ordered moment of the ferromagnetic order are strongly suppressed as La is substituted for Sr. The ac-susceptibility exhibits a peak at T* due to the occurrence of spontaneous spin polarization. Furthermore, we observed that T* shows clear frequency variations for x ≥ 0.3. The magnitude of the frequency shifts of T* is comparable to that of cluster-glass systems, and the frequency dependence is well described in terms of the Vogel–Fulcher law. On the other hand, it is found that the linear specific heat coefficient γ enhances with the suppression of the ferromagnetic order. The relatively large γ values reflect the presence of the Ru 4d state at Fermi level, and hence, the magnetism of this system is considered to be tightly coupled with the itinerant characteristics of the Ru 4d electrons. The present experimental results and analyses suggest that the intrinsic coexistence of the spatially inhomogeneous magnetic state and the itinerant nature of the Ru 4d electrons is realized in this system, and such a feature may be commonly involved in La- and Ca-doped SrRuO₃.

https://doi.org/10.7566/JPSJ.83.064712

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Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr1−xLaxRuO3

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Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr₁₋_xLa_xRuO₃