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

被引：14

作者：

Asih, Retno ^{[1
,2
,3
]}

Adam, Noraina ^{[1
,4
]}

Mohd-Tajudin, Saidah Sakinah ^{[1
,4
]}

Sari, Dita Puspita ^{[1
,2
,3
]}

Matsuhira, Kazuyuki ^{[5
]}

Guo, Hanjie ^{[1
,6
,7
,11
]}

Wakeshima, Makoto ^{[8
]}

Hinatsu, Yukio ^{[8
]}

Nakano, Takehito ^{[2
]}

Nozue, Yasuo ^{[2
]}

Sulaiman, Shukri ^{[4
]}

Mohamed-Ibrahim, Mohamad Ismail ^{[4
]}

Biswas, Pabitra Kumar ^{[9
,12
]}

Watanabe, Isao ^{[1
,2
,4
,6
,7
,10
]}

机构：

[1] RIKEN Nishina Ctr, Adv Meson Sci Lab, Wako, Saitama 3510198, Japan

[2] Osaka Univ, Grad Sch Sci, Dept Phys, Toyonaka, Osaka 5600043, Japan

[3] Inst Teknol Sepuluh Nopember, Fac Math & Nat Sci, Dept Phys, Surabaya 60111, Indonesia

[4] Univ Sains Malaysia, Sch Distance Educ, Computat Chem & Phys Lab, George Town 11800, Malaysia

[5] Kyushu Inst Technol, Fac Engn, Kitakyushu, Fukuoka 8048550, Japan

[6] Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China

[7] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China

[8] Hokkaido Univ, Grad Sch Sci, Div Chem, Sapporo, Hokkaido 0600810, Japan

[9] Paul Scherrer Inst, Bulk SR Grp, CH-5232 Villigen, Switzerland

[10] Hokkaido Univ, Dept Condensed Matter Phys, Muon Spin Resonance Lab, Fac Sci, Sapporo, Hokkaido 0600810, Japan

[11] Max Planck Inst Chem Phys Solids, Phys Correlated Matter, D-01187 Dresden, Germany

[12] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2017年 / 86卷 / 02期

关键词：

LATTICE SYSTEM SRCR8GA4O19; TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; KAGOME LATTICE; LIQUID;

D O I：

10.7566/JPSJ.86.024705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 (mu SR) 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 mu SR 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 mu(B) and 0.2 mu(B) for Ir and Nd moments in Nd227, and 0.3 mu(B) and 0.1 mu(B) 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.

引用

页数：7

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