4.7 Article

Magnetic and structural properties of the solid solution CuAl2(1-x) Ga2xO4

Journal

SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -

Publisher

NATURE RESEARCH
DOI: 10.1038/s41598-021-89197-1

Keywords

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Funding

  1. Air Force Office of Scientific Research (AFOSR) LRIR Grant [14RQ08COR, 18RQCOR100, 19RXCOR052]
  2. AFRL Aerospace Systems Directorate (AFRL/RQ)
  3. National Research Council (NRC)
  4. Scientific User Facilities Division Office of Basic Energy Sciences, U.S. Department of Energy (DOE)
  5. U.S. DOE [DE-AC05-00OR22725]
  6. DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
  7. NRC Research Associateship awards at AFRL/RQ

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The study investigates the magnetic and structural properties of the solid solution CuAl2(1-x)Ga2xO4, demonstrating a shift in Cu2+ ions from tetrahedral to octahedral sites with increasing Ga3+ ion concentration. While most of the solution exhibits glassy behavior, the trend is towards decreasing magnetic frustration as the Cu2+ ion moves to the B-site, with exceptions in the x = 0.1 and 0.2 members which show delayed spin glass transition. These members are suggested as additional candidates for investigating highly frustrated exotic quantum states.
CuAl2O4 is a ternary oxide spine! with Cu2+ ions (s = 1/2) primarily populating the A-site diamond sublattice. The compound is reported to display evidence of spin glass behavior but possess a non-frozen magnetic ground state below the transition temperature. On the other hand, the spinel CuGa2O4 displays spin glass behavior at similar to 2.5 K with Cu2+ ions more readily tending to the B-site pyrochlore sublattice. Therefore, we investigate the magnetic and structural properties of the solid solution CuAl2(1-x)Ga2xO4 examining the evolution of the magnetic behavior as Al3+ is replaced with a much larger Ga3+ ion. Our results show that the Cu2+ ions tend to migrate from tetrahedral to octahedral sites as the Ga3+ ion concentration increases, resulting in a concomitant change in the glassy magnetic properties of the solution. Results indicate glassy behavior for much of the solution with a general trend towards decreasing magnetic frustration as the Cu2+ ion shifts to the B-site. However, the x = 0.1 and 0.2 members of the system do not show glassy behavior down to our measurement limit (1.9 K) suggesting a delayed spin glass transition. We suggest that these two members are additional candidates for investigation to access highly frustrated exotic quantum states.

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