Frustration by competing interactions in the highly distorted double perovskites La2NaB′O6 (B′ = Ru, Os)

被引：47
|
作者：
Aczel, A. A. [1 ]
Bugaris, D. E. [2 ]
Li, L. [3 ]
Yan, J-Q [3 ,4 ]
de la Cruz, C. [1 ]
zur Loye, H-C [2 ]
Nagler, S. E. [1 ,5 ]
机构：
[1] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Neutron Sci Directorate, Oak Ridge, TN 37831 USA
[2] Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA
[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[5] Univ Tennessee, CIRE, Knoxville, TN 37996 USA
来源：
PHYSICAL REVIEW B | 2013年 / 87卷 / 01期
关键词：
MAGNETIC-PROPERTIES; NEUTRON-DIFFRACTION; CRYSTAL-GROWTH; PR; LA; ND; LN;
D O I：
10.1103/PhysRevB.87.014435
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The usual classical behavior of S = 3/2, B-site ordered double perovskites generally results in simple, commensurate magnetic ground states. In contrast, combined magnetic susceptibility, heat capacity, and neutron powder diffraction measurements for the S = 3/2 systems La2NaB'O-6 (B' = Ru, Os) reveal an incommensurate magnetic ground state for La2NaRuO6 and a drastically suppressed ordered moment for La2NaOsO6. This behavior is attributed to the large monoclinic structural distortions of these double perovskites. The distortions have the effects of creating inequivalent nearest neighbor (NN) superexchange interactions and weakening them on average, possibly to an energy scale that is comparable with the average next nearest neighbor (NNN) superexchange. The exotic ground states in these materials can then arise from a competition between some combination of inequivalent NN and NNN exchange interactions, providing an unusual mechanism for achieving frustration in the double perovskite family. DOI: 10.1103/PhysRevB.87.014435
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页数：7
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