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

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [4];  [4];  [1]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
OSTI ID:
1265814
Alternate ID(s):
OSTI ID: 1222364
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 9; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (3)

[OsF 6 ] x : Molecular Models for Spin-Orbit Entangled Phenomena journal July 2017
Spin-orbit coupling control of anisotropy, ground state and frustration in 5d2 Sr2MgOsO6 journal August 2016
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