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Title: Strong competition between orbital ordering and itinerancy in a frustrated spinel vanadate

Journal Article · · Physical Review B
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [3];  [4];  [2];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
+ Show Author Affiliations

In this study, the crossover from localized to itinerant electron regimes in the geometrically frustrated spinel system Mn1-xCoxV2O4 is explored by neutron-scattering measurements, first-principles calculations, and spin models. At low Co doping, the orbital ordering (OO) of the localized V3+ spins suppresses magnetic frustration by triggering a tetragonal distortion. At high Co doping levels, however, electronic itinerancy melts the OO and lessens the structural and magnetic anisotropies, thus increasing the amount of geometric frustration for the V-site pyrochlore lattice. Contrary to the predicted paramagentism induced by chemical pressure, the measured noncollinear spin states in the Co-rich region of the phase diagram provide a unique platform where localized spins and electronic itinerancy compete in a geometrically frustrated spinel.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Spallation Neutron Source
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265325
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 91; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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  • Azuah, Richard Tumanjong; Kneller, Larry R.; Qiu, Yiming
  • Journal of Research of the National Institute of Standards and Technology, Vol. 114, Issue 6 https://doi.org/10.6028/jres.114.025
journal November 2009

Cited By (4)

Insulator-metal transition and quasi-flat-band of Shastry–Sutherland lattice journal June 2019
Enhanced orbital fluctuations in Mg-doped Mn V 2 O 4 single crystals journal December 2019
Variety of elastic anomalies in an orbital-active nearly itinerant cobalt vanadate spinel journal July 2017
A variety of elastic anomalies in orbital-active nearly-itinerant cobalt vanadate spinel text January 2017

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36 MATERIALS SCIENCE