Magnetic order in the pyrochlore iridates A2Ir2O7 (A = Y, Yb)

被引：93

作者：

Disseler, S. M. ^{[1
]}

Dhital, Chetan ^{[1
]}

Amato, A. ^{[2
]}

Giblin, S. R. ^{[3
]}

de la Cruz, Clarina ^{[4
]}

Wilson, Stephen D. ^{[1
]}

Graf, M. J. ^{[1
]}

机构：

[1] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[3] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[4] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.86.014428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present results from muon spin relaxation/rotation, magnetization, neutron scattering, and transport measurements on polycrystalline samples of the pyrochlore iridates Y2Ir2O7 (Y-227) and Yb2Ir2O7 (Yb-227). Well-defined spontaneous oscillations of the muon asymmetry are observed together with hysteretic behavior in magnetization below 130 K in Yb-227, indicative of commensurate long-range magnetic order. Similar oscillations are observed in Y-227 below 150 K; however, the onset of hysteretic magnetization at T = 190 K indicates a transition to an intermediate state lacking long-range order as observed in Nd-227. Our results also show that insulating members of the iridate family have nearly identical magnetic ground states, and that the presence of magnetic A-site species does not play any significant role in altering the ground-state properties.

引用

页数：8

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