Journal
PHYSICAL REVIEW B
Volume 104, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.094204
Keywords
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Funding
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences (BES), Materials Sciences and Engineering Division
- Tennessee Higher Education Commission (THEC)
- DOE Office of Science [DE-AC02-06CH11357]
- Oak Ridge National Laboratory (ORNL) by the Scientific User Facilities Division, BES, DOE
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This study investigates the influence of hole doping on the magnetic properties of the compositionally complex high-entropy oxide La1-xSrx(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O-3. It is found that aliovalent A-site substitution can manipulate the magnetically active B-site sublattice, leading to stronger ferromagnetic response and changes in magnetic anisotropy. Magnetometry results show complex and nonuniform responses, indicating the presence of locally inhomogeneous magnetic phase competition.
The influence of hole doping on magnetic properties is mapped for the compositionally complex high-entropy oxide ABO(3) perovskite La1-xSrx(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O-3 (0 <= x <= 0.5). It is found that aliovalent A-site substitution is a viable means to manipulate the magnetically active B-site sublattice. A series of single-crystal films are synthesized and show a general trend toward stronger ferromagnetic response and a shift in magnetic anisotropy as the Sr concentration increases. Magnetometry demonstrates complex and nonuniform responses similar to rigid and uncoupled composites at intermediate dopings. This behavior points to the presence of locally inhomogeneous magnetic phase competition, where ferromagnetic and antiferromagnetic magnetic contributions create a frustrated matrix containing uncompensated spins at the boundaries between these regions. The observations are discussed in the context of known responses to hole doping in the less complex ternary LaTMO3 (T-M = Cr, Mn, Fe, Co, Ni) oxides, and they are found to be different from a simple sum of the doped parents. The results are summarized in a preliminary magnetic phase diagram.
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