TY - JOUR
T1 - Magnetic moments and ordered states in pyrochlore iridates Nd2Ir2O7 and Sm2Ir2O7 studied by muon-spin relaxation
AU - Asih, Retno
AU - Adam, Noraina
AU - Mohd-Tajudin, Saidah Sakinah
AU - Sari, Dita Puspita
AU - Matsuhira, Kazuyuki
AU - Guo, Hanjie
AU - Wakeshima, Makoto
AU - Hinatsu, Yukio
AU - Nakano, Takehito
AU - Nozue, Yasuo
AU - Sulaiman, Shukri
AU - Mohamed-Ibrahim, Mohamad Ismail
AU - Biswas, Pabitra Kumar
AU - Watanabe, Isao
N1 - Publisher Copyright:
©2017 The Physical Society of Japan.
PY - 2017
Y1 - 2017
N2 - Magnetic-ordered states of the pyrochlore iridates Nd2Ir2O7 (Nd227) and Sm2Ir2O7 (Sm227), showing metal-insulator transitions at 33 and 117 K, respectively, were studied by both the muon-spin-relaxation (μSR) method and density functional theory (DFT) calculations. A long-range magnetic ordering of Ir moments appeared in conjunction with the metal insulator transition, and additional long-range-ordered states of Nd/Sm moments were confirmed at temperatures below about 10 K. We found that the all-in all-out spin structure most convincingly explained the present μSR results of both Nd227 and Sm227. Observed internal fields were compared with values derived from DFT calculations. The lower limits of the sizes of magnetic moments were estimated to be 0.12 μB and 0.2 μB for Ir and Nd moments in Nd227, and 0.3 μB and 0.1 μB for Ir and Sm moments in Sm227, respectively. Further analysis indicated that the spin coupling between Ir and Nd/Sm moments was ferromagnetic for Nd227 and antiferromagnetic for Sm227.
AB - Magnetic-ordered states of the pyrochlore iridates Nd2Ir2O7 (Nd227) and Sm2Ir2O7 (Sm227), showing metal-insulator transitions at 33 and 117 K, respectively, were studied by both the muon-spin-relaxation (μSR) method and density functional theory (DFT) calculations. A long-range magnetic ordering of Ir moments appeared in conjunction with the metal insulator transition, and additional long-range-ordered states of Nd/Sm moments were confirmed at temperatures below about 10 K. We found that the all-in all-out spin structure most convincingly explained the present μSR results of both Nd227 and Sm227. Observed internal fields were compared with values derived from DFT calculations. The lower limits of the sizes of magnetic moments were estimated to be 0.12 μB and 0.2 μB for Ir and Nd moments in Nd227, and 0.3 μB and 0.1 μB for Ir and Sm moments in Sm227, respectively. Further analysis indicated that the spin coupling between Ir and Nd/Sm moments was ferromagnetic for Nd227 and antiferromagnetic for Sm227.
UR - http://www.scopus.com/inward/record.url?scp=85014599253&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.86.024705
DO - 10.7566/JPSJ.86.024705
M3 - Article
AN - SCOPUS:85014599253
SN - 0031-9015
VL - 86
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 2
M1 - 024705
ER -