Magnetic ground state of La2LiMoO6: A comparison with other Mo5+ ( S=1/2 ) double perovskites

Dragomir, Mirela; Aczel, Adam A.; Wiebe, Christopher R.; Lussier, Joey A.; Dube, Paul; Greedan, John E.

doi:10.1103/physrevmaterials.4.104406

Title: Magnetic ground state of La₂LiMoO₆: A comparison with other Mo⁵⁺ ( S=1/2 ) double perovskites

Abstract

La₂LiMoO₆ is a double perovskite (DP) with P2₁/n symmetry based on the Mo5+ ion, 4d1, t2g1, S=1/2. It is isostructural with Sr₂YMoO₆, the magnetic ground state of which is apparently a very unusual collective spin singlet or valence-bond glass state as is the case for cubic (Fm-3m) Ba₂YMoO₆. Initial studies of La₂LiMoO₆ suggested a different ground state from the other DPs but no clear conclusions could be drawn. A more detailed study is presented here including magnetic susceptibility, heat capacity, and elastic neutron-scattering results. This DP is now well characterized as an antiferromagnet, T_N=18K, via observation of magnetic Bragg peaks in neutron scattering and an anomaly in the magnetic heat capacity. The ordering wave vector is k=(_1/21/20), consistent with a type I face-centered-cubic magnetic structure, and the ordered moment on Mo⁵⁺ is 0.32(11)μ_B, much reduced from the spin-only value of 1μ_B. The index, f=|v_c|/T_N~3, indicates a low level of frustration. The heat-capacity data above T_N can be interpreted in terms of a one-dimensional spin-correlation model, as can the low-temperature data which follow a T¹ power law. This is consistent with an earlier suggestion. The difference with isostructural Sr₂YMoO₆ is attributed to differences in the local distortion of the Mo–O octahedronmore » and the resulting orbital ordering.« less

Authors:

^[1];

^[2];

^[3];

^[4];

^[5];

^[5]

McMaster Univ., Hamilton, ON (Canada); Jožef Stefan Inst., Ljubljana (Slovenia)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Winnipeg (Canada); Univ. of Edinburgh (United Kingdom)
Univ. of Winnipeg (Canada)
McMaster Univ., Hamilton, ON (Canada)

Publication Date:: Mon Oct 12 00:00:00 EDT 2020

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1706267

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Materials

Additional Journal Information:: Journal Volume: 4; Journal Issue: 10; Journal ID: ISSN 2475-9953

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Magnetic interactions; Magnetic order; Magnetic phase transitions; Magnetic susceptibility

Citation Formats


                    Dragomir, Mirela, Aczel, Adam A., Wiebe, Christopher R., Lussier, Joey A., Dube, Paul, and Greedan, John E. Magnetic ground state of La2LiMoO6: A comparison with other Mo5+ ( S=1/2 ) double perovskites.  United States: N. p., 2020. 
Web.  doi:10.1103/physrevmaterials.4.104406.

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                    Dragomir, Mirela, Aczel, Adam A., Wiebe, Christopher R., Lussier, Joey A., Dube, Paul, & Greedan, John E. Magnetic ground state of La2LiMoO6: A comparison with other Mo5+ ( S=1/2 ) double perovskites.  United States.  https://doi.org/10.1103/physrevmaterials.4.104406

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                    Dragomir, Mirela, Aczel, Adam A., Wiebe, Christopher R., Lussier, Joey A., Dube, Paul, and Greedan, John E. Mon .  
"Magnetic ground state of La2LiMoO6: A comparison with other Mo5+ ( S=1/2 ) double perovskites".  United States.  https://doi.org/10.1103/physrevmaterials.4.104406.  https://www.osti.gov/servlets/purl/1706267.

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@article{osti_1706267,

  title        = {Magnetic ground state of La2LiMoO6: A comparison with other Mo5+ ( S=1/2 ) double perovskites},

  author       = {Dragomir, Mirela and Aczel, Adam A. and Wiebe, Christopher R. and Lussier, Joey A. and Dube, Paul and Greedan, John E.},

  abstractNote = {La2LiMoO6 is a double perovskite (DP) with P21/n symmetry based on the Mo5+ ion, 4d1, t2g1, S=1/2. It is isostructural with Sr2YMoO6, the magnetic ground state of which is apparently a very unusual collective spin singlet or valence-bond glass state as is the case for cubic (Fm-3m) Ba2YMoO6. Initial studies of La2LiMoO6 suggested a different ground state from the other DPs but no clear conclusions could be drawn. A more detailed study is presented here including magnetic susceptibility, heat capacity, and elastic neutron-scattering results. This DP is now well characterized as an antiferromagnet, TN=18K, via observation of magnetic Bragg peaks in neutron scattering and an anomaly in the magnetic heat capacity. The ordering wave vector is k=(1/21/20), consistent with a type I face-centered-cubic magnetic structure, and the ordered moment on Mo5+ is 0.32(11)μB, much reduced from the spin-only value of 1μB. The index, f=|vc|/TN~3, indicates a low level of frustration. The heat-capacity data above TN can be interpreted in terms of a one-dimensional spin-correlation model, as can the low-temperature data which follow a T1 power law. This is consistent with an earlier suggestion. The difference with isostructural Sr2YMoO6 is attributed to differences in the local distortion of the Mo–O octahedron and the resulting orbital ordering.},

  doi          = {10.1103/physrevmaterials.4.104406},

  journal      = {Physical Review Materials},

  number       = 10,

  volume       = 4,

  place        = {United States},

  year         = {Mon Oct 12 00:00:00 EDT 2020},

  month        = {Mon Oct 12 00:00:00 EDT 2020}

}

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Title: Magnetic ground state of La2LiMoO6: A comparison with other Mo5+ ( S=1/2 ) double perovskites

Abstract

Citation Formats

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Frustrated magnetism in the double perovskite L a 2 LiOs O 6 : A comparison with L a 2 LiRu O 6 journal, January 2016

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Magnetic properties of the geometrically frustrated S = 1 2 antiferromagnets, La 2 LiMoO 6 and Ba 2 YMoO 6 , with the B-site ordered double perovskite structure: Evidence for a collective spin-singlet ground state journal, June 2010

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Title: Magnetic ground state of La₂LiMoO₆: A comparison with other Mo⁵⁺ ( S=1/2 ) double perovskites

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Interplay between lattice distortion and spin-orbit coupling in double perovskites
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Frustrated magnetism in the double perovskite $L a_{2} LiOs O_{6}$ : A comparison with $L a_{2} LiRu O_{6}$
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Radial integrals for the magnetic form factor of 5 d transition elements
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