Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOs6 and Ca2CoOsO6

Morrow, Ryan; Yan, Jiaqiang; McGuire, Michael A.; Freeland, John W.; Haskel, Daniel; Woodward, Patrick M.

doi:10.1103/PhysRevB.92.094435

Title: Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOs₆ and Ca₂CoOsO₆

Abstract

The magnetic ground state in the double perovskite system Sr_2-xCa_xCoOsO₆ changes from an antiferromagnet (x=0), to a spin glass (x=1), to a ferrimagnet (x=2) as the Ca content increases. Moreover, this crossover is driven by chemical pressure effects that control the relative strength of magnetic exchange interactions. The synthesis, crystal structure, and magnetism of SrCaCoOsO₆ and Ca₂CoOsO₆ are investigated and compared with Sr₂CoOsO₆. Both compounds adopt a monoclinic crystal structure with rock-salt ordering of Co²⁺ and Os⁶⁺ and a^-a^-b⁺ octahedral tilting, but the average Co–O–Os bond angle evolves from 158.0(3) in SrCaCoOsO₆ to 150.54(9)° in Ca₂CoOsO₆ as the smaller Ca²+ ion replaces Sr²⁺. And while this change may seem minor, it has a profound effect on the magnetism, changing the magnetic ground state from antiferromagnetic in Sr₂CoOsO₆ (TN1=108K, T_N2=70K), to a spin glass in SrCaCoOsO₆ (T_f1=32K, T_f2=13K), to ferrimagnetic in Ca₂CoOsO₆ (T_C=145K). Finally, in the first two compounds the observation of two transitions is consistent with weak coupling between the Co and Os sublattices.

Authors:

Morrow, Ryan ^[1]; Yan, Jiaqiang ^[2]; McGuire, Michael A. ^[3]; Freeland, John W. ^[4]; Haskel, Daniel ^[4]; Woodward, Patrick M. ^[1]

The Ohio State Univ., Columbus, OH (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Publication Date:: 2015-09-21

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

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

OSTI Identifier:: 1265814

Alternate Identifier(s):: OSTI ID: 1222364

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 92; Journal Issue: 9; 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

Citation Formats


                    Morrow, Ryan, Yan, Jiaqiang, McGuire, Michael A., Freeland, John W., Haskel, Daniel, and Woodward, Patrick M.. Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOs6 and Ca2CoOsO6.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevB.92.094435.

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                    Morrow, Ryan, Yan, Jiaqiang, McGuire, Michael A., Freeland, John W., Haskel, Daniel, & Woodward, Patrick M.. Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOs6 and Ca2CoOsO6.  United States.  https://doi.org/10.1103/PhysRevB.92.094435

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                    Morrow, Ryan, Yan, Jiaqiang, McGuire, Michael A., Freeland, John W., Haskel, Daniel, and Woodward, Patrick M.. Mon .  
"Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOs6 and Ca2CoOsO6".  United States.  https://doi.org/10.1103/PhysRevB.92.094435.  https://www.osti.gov/servlets/purl/1265814.

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@article{osti_1265814,

  title        = {Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOs6 and Ca2CoOsO6},

  author       = {Morrow, Ryan and Yan, Jiaqiang and McGuire, Michael A. and Freeland, John W. and Haskel, Daniel and Woodward, Patrick M.},

  abstractNote = {The magnetic ground state in the double perovskite system Sr2-xCaxCoOsO6 changes from an antiferromagnet (x=0), to a spin glass (x=1), to a ferrimagnet (x=2) as the Ca content increases. Moreover, this crossover is driven by chemical pressure effects that control the relative strength of magnetic exchange interactions. The synthesis, crystal structure, and magnetism of SrCaCoOsO6 and Ca2CoOsO6 are investigated and compared with Sr2CoOsO6. Both compounds adopt a monoclinic crystal structure with rock-salt ordering of Co2+ and Os6+ and a-a-b+ octahedral tilting, but the average Co–O–Os bond angle evolves from 158.0(3) in SrCaCoOsO6 to 150.54(9)° in Ca2CoOsO6 as the smaller Ca2+ ion replaces Sr2+. And while this change may seem minor, it has a profound effect on the magnetism, changing the magnetic ground state from antiferromagnetic in Sr2CoOsO6 (TN1=108K, TN2=70K), to a spin glass in SrCaCoOsO6 (Tf1=32K, Tf2=13K), to ferrimagnetic in Ca2CoOsO6 (TC=145K). Finally, in the first two compounds the observation of two transitions is consistent with weak coupling between the Co and Os sublattices.},

  doi          = {10.1103/PhysRevB.92.094435},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 9,

  volume       = 92,

  place        = {United States},

  year         = {2015},

  month        = {9}

}

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Title: Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOs6 and Ca2CoOsO6

Abstract

Citation Formats

Spin liquids in frustrated magnets journal, March 2010

Spin Ice State in Frustrated Magnetic Pyrochlore Materials journal, November 2001

Spin glasses: Experimental facts, theoretical concepts, and open questions journal, October 1986

Cation ordering in perovskites journal, January 2010

Structural Chemistry and Electronic Properties of Sr2FeIrO6 journal, July 1999

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

Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba 2 YMoO 6 journal, September 2011

Exotic Magnetism on the Quasi-fcc Lattices of the d 3 Double Perovskites La 2 Na B ′ O 6 ( B ′ = Ru , Os) journal, March 2014

Frustration-driven spin freezing in the S = 1 2 fcc perovskite Sr 2 MgReO 6 journal, October 2003

Sr 2 Cr Os O 6 : End point of a spin-polarized metal-insulator transition by 5 d band filling journal, January 2007

Independent Ordering of Two Interpenetrating Magnetic Sublattices in the Double Perovskite Sr 2 CoOsO 6 journal, December 2013

Lattice-Site-Specific Spin Dynamics in Double Perovskite Sr 2 CoOsO 6 journal, April 2014

Lattice Instability and Competing Spin Structures in the Double Perovskite Insulator Sr 2 FeOsO 6 journal, October 2013

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Title: Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOs₆ and Ca₂CoOsO₆

Spin liquids in frustrated magnets
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Spin Ice State in Frustrated Magnetic Pyrochlore Materials
journal, November 2001

Spin glasses: Experimental facts, theoretical concepts, and open questions
journal, October 1986

Cation ordering in perovskites
journal, January 2010

Structural Chemistry and Electronic Properties of Sr2FeIrO6
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Magnetic properties of the geometrically frustrated $S = \frac{1}{2}$ 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
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EXPGUI , a graphical user interface for GSAS
journal, April 2001

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journal, May 2006

The classification of tilted octahedra in perovskites
journal, November 1972

Structure and Magnetic Properties of Sr ₂ CoWO ₆ : An Ordered Double Perovskite Containing Co ²⁺ (HS) with Unquenched Orbital Magnetic Moment
journal, April 2003

Experimental Confirmation of the X-Ray Magnetic Circular Dichroism Sum Rules for Iron and Cobalt
journal, July 1995

Electronic structure investigation of CoO by means of soft x-ray scattering
journal, April 2002

Synthesis, Crystal Structure, and Properties of the Ordered Double Perovskite Sr ₂ CoOsO ₆ : Ordered Double Perovskite Sr
journal, September 2013

Radial integrals for the magnetic form factor of the 5 d electrons of rare earth elements
journal, July 2012

Novel dynamical magnetic properties in the spin ice compound Dy ₂ Ti ₂ O ₇
journal, July 2001

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journal, July 2017

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journal, August 2016

On understanding bandgap bowing and optoelectronic quality in Pb–Sn alloy hybrid perovskites
journal, January 2019

$μ SR$ and neutron diffraction studies on the tuning of spin-glass phases in the partially ordered double perovskites $SrM n_{1 - x} W_{x} O_{3}$
journal, June 2019