Charge doping effects on magnetic properties of single-crystal La1-xSrx(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 (0 ≤ x ≤ 0.5) high-entropy perovskite oxides

Mazza, Alessandro; Skoropata, Elizabeth; Lapano, Jason; Zhang, Jie; Sharma, Yogesh; Musico, Brianna L.; Keppens, Veerle; Gai, Zheng; Brahlek, Matthew; Moreo, Adriana; Gilbert, Dustin; Dagotto, Elbio R.; Ward, Zac

doi:10.1103/physrevb.104.094204

Title: Charge doping effects on magnetic properties of single-crystal La_1-xSr_x(Cr_0.2Mn_0.2Fe_0.2Co_0.2Ni_0.2)O₃ (0 ≤ x ≤ 0.5) high-entropy perovskite oxides

Journal Article · Wed Sep 15 00:00:00 EDT 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.104.094204· OSTI ID:1836433

^[1];

^[1]; Lapano, Jason ^[1];

^[1];

^[2]; Musico, Brianna L. ^[3]; Keppens, Veerle ^[3];

^[1];

^[1]; Moreo, Adriana ^[4]; Gilbert, Dustin ^[3]; Dagotto, Elbio R. ^[4];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

The observed influence of hole doping on magnetic properties is mapped for the compositionally complex high-entropy oxide ABO₃ perovskite La_1-xSr_x(Cr_0.2Mn_0.2Fe_0.2Co_0.2Ni_0.2)O₃ (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 LaT_MO₃ (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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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1836433

Journal Information:: Physical Review B, Vol. 104, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Charge doping effects on magnetic properties of single-crystal La1-xSrx(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 (0 ≤ x ≤ 0.5) high-entropy perovskite oxides

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Title: Charge doping effects on magnetic properties of single-crystal La_1-xSr_x(Cr_0.2Mn_0.2Fe_0.2Co_0.2Ni_0.2)O₃ (0 ≤ x ≤ 0.5) high-entropy perovskite oxides