Magnetic Moments and Ordered States in Pyrochlore Iridates Nd2Ir2O7 and Sm2Ir2O7 Studied by Muon-Spin Relaxation

• DOI: 10.7566/jpsj.86.024705
• Publication Date: 2017-01-13T01:02:42Z
• Authors: Retno Asih; Noraina Adam; Saidah Sakinah Mo...; Dita Puspita Sari; Kazuyuki Matsuhira; Hanjie Guo; Makoto Wakeshima; Yukio Hinatsu; Takehito Nakano; Yasuo Nozue; Shukri Sulaiman; Mohamad Ismail Mo...; Pabitra Kumar Biswas; Isao Watanabe
• Keywords: Muon spin spectroscopy

Magnetic-ordered states of the pyrochlore iridates Nd2Ir2O7 (Nd227) and Sm2Ir2O7 (Sm227), showing metal–insulator transitions at 33 117 K, respectively, were studied by both muon-spin-relaxation (μSR) method density functional theory (DFT) calculations. A long-range magnetic ordering Ir moments appeared in conjunction with metal insulator transition, additional long-range-ordered Nd/Sm confirmed temperatures below about 10 K. We found that all-in all-out spin structure most convincingly explained present μSR results Nd227 Sm227. Observed internal fields compared values derived from DFT The lower limits sizes estimated to be 0.12 μB 0.2 for Nd Nd227, 0.3 0.1 Sm Sm227, respectively. Further analysis indicated coupling between was ferromagnetic antiferromagnetic