Spin gap and the nature of the 4d3 magnetic ground state in the frustrated fcc antiferromagnet Ba2YRuO6

被引：29

作者：

Carlo, J. P. ^{[1
]}

Clancy, J. P. ^{[2
]}

Fritsch, K. ^{[3
]}

Marjerrison, C. A. ^{[3
]}

Granroth, G. E. ^{[4
]}

Greedan, J. E. ^{[5
,6
]}

Dabkowska, H. A. ^{[6
]}

Gaulin, B. D. ^{[3
,6
,7
]}

机构：

[1] Villanova Univ, Dept Phys, Villanova, PA 19085 USA

[2] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[3] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

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

[5] McMaster Univ, Dept Chem, Hamilton, ON L8S 4M1, Canada

[6] McMaster Univ, Brockhouse Inst Mat Res, Hamilton, ON L8S 4M1, Canada

[7] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevB.88.024418

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The geometrically frustrated double-perovskite Ba2YRuO6 has magnetic 4d(3) Ru5+ ions decorating an undistorted face-centered-cubic lattice. This material has been previously reported to exhibit commensurate long-range antiferromagnetic order below T-N similar to 36 K, a factor f similar to 15 times lower than its Curie-Weiss temperature Theta(CW) = -522 K, and purported short-range order to T* = 47 K. We report new time-of-flight neutron spectroscopy of Ba2YRuO6 which shows the development of a similar to 5 meV spin gap in the vicinity of the [100] magnetic ordering wave vector below T-N = 36 K, with the transition to long-range order occurring at T* = 47 K. We also report spin waves extending to similar to 14 meV, a surprisingly small bandwidth in light of the large Theta(CW). We compare the spin gap and bandwidth to relevant neutron studies of the isostructural 4d(1) material Ba2YMoO6, and discuss the results in the framework of relatively strong spin-orbit coupling expected in 4d magnetic systems.

引用

页数：6

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