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Title: Frustration by competing interactions in the highly distorted double perovskites La 2 Na B ' O 6 ( B ' = Ru , Os)

Abstract

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 La 2 Na B' O 6 ( B' = Ru , Os) reveal an incommensurate magnetic ground state for La 2 NaRuO 6 and a drastically suppressed ordered moment for La 2 NaOsO 6 . 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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Heterogeneous Functional Materials Center (HeteroFoaM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1383124
DOE Contract Number:  
SC0001061
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 1; Related Information: HeteroFoaM partners with University of South Carolina (lead); University of California, Santa Barbara; University of Connecticut; Georgia Institute of Technology; Princeton University; Rochester Institute of Technology; Savannah River National Laboratory; University of South Carolina; University of Utah; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; catalysis (heterogeneous), energy storage (including batteries and capacitors), hydrogen and fuel cells, mechanical behavior, charge transport, membrane, carbon sequestration, materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)

Citation Formats

Aczel, A. A., Bugaris, D. E., Li, L., Yan, J. -Q., de la Cruz, C., zur Loye, H. -C., and Nagler, S. E. Frustration by competing interactions in the highly distorted double perovskites La 2 Na B' O 6 ( B'=Ru , Os). United States: N. p., 2013. Web. doi:10.1103/PhysRevB.87.014435.
Aczel, A. A., Bugaris, D. E., Li, L., Yan, J. -Q., de la Cruz, C., zur Loye, H. -C., & Nagler, S. E. Frustration by competing interactions in the highly distorted double perovskites La 2 Na B' O 6 ( B'=Ru , Os). United States. https://doi.org/10.1103/PhysRevB.87.014435
Aczel, A. A., Bugaris, D. E., Li, L., Yan, J. -Q., de la Cruz, C., zur Loye, H. -C., and Nagler, S. E. Tue . "Frustration by competing interactions in the highly distorted double perovskites La 2 Na B' O 6 ( B'=Ru , Os)". United States. https://doi.org/10.1103/PhysRevB.87.014435.
@article{osti_1383124,
title = {Frustration by competing interactions in the highly distorted double perovskites La 2 Na B' O 6 ( B'=Ru , Os)},
author = {Aczel, A. A. and Bugaris, D. E. and Li, L. and Yan, J. -Q. and de la Cruz, C. and zur Loye, H. -C. and Nagler, S. E.},
abstractNote = {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 La 2 Na B' O 6 ( B' = Ru , Os) reveal an incommensurate magnetic ground state for La 2 NaRuO 6 and a drastically suppressed ordered moment for La 2 NaOsO 6 . 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},
url = {https://www.osti.gov/biblio/1383124}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 1,
volume = 87,
place = {United States},
year = {2013},
month = {1}
}

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Synthesis and magnetic properties of the double perovskites <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mrow><mml:mi>L</mml:mi><mml:msub><mml:mrow><mml:mi>n</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mrow><mml:mi mathvariant="normal">NaRuO</mml:mi></mml:mrow></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> (Ln=La, Pr, Nd)
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