Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 259, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.202100564
Keywords
A-site cation ordering; electronic phase separation; oxygen vacancies; post-annealing; superlattices
Categories
Funding
- National Key R&D Program of China [2017YFA0303600]
- National Natural Science Foundation of China [11974409, 11634016]
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB33000000]
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It has been found that artificially ordered (111)-oriented [(SrMnO3)(1)/(LaMnO3)(2)](n) superlattices with respect to the compositionally equivalent La2/3Sr1/3MnO3 films with a random distribution of A-site dopants have similar ferromagnetism and electrical transport properties. However, the superlattices have a tendency to preserve oxygen vacancies inside, making them more difficult to be compensated by the post-annealing process.
(111)-oriented [(SrMnO3)(1)/(LaMnO3)(2)](n) superlattices with artificial A-site cation ordering with respect to the compositionally equivalent La2/3Sr1/3MnO3 films with a random distribution of the A-site dopants are fabricated. It is found that the ferromagnetism and electrical transport properties of La2/3Sr1/3MnO3 films are primarily independent of the degree of A-site cation ordering, as evidenced by their identical critical temperatures of phase transition. These results may reveal the spontaneous nature of the electronic phase separation, which is key to the colossal magnetoresistance effect in manganites. In contrast, compared to the La2/3Sr1/3MnO3 films, the A-site ordered (111) superlattices have a tendency to preserve oxygen vacancies inside, making them extremely difficult to be compensated by the post-annealing process.
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