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A-site-ordered quadruple perovskite manganites, AMn7O12, show many interesting physical phenomena. Doping with Cu2+ can result in colossal magnetoresistance properties, ferrimagnetism, and additional structural modulations producing electric-dipole helicoidal textures. Small-concentration doping was investigated in a limited number of systems, e.g., in BiCuxMn7xO12. In this work, we investigated solid solutions of NdCuxMn7-xO12 with x = 0.1, 0.2, and 0.3, prepared at 6 GPa and 1500 K. Specific heat measurements detected three magnetic transitions in x = 0 (at TN3 = 9 K, TN2 = 12 K, and TN1 = 84 K) and two transition in x = 0.1 (at TN2 = 10 K and TN1 = 78 K); while only one transition was found in x = 0.2 (TN1 = 72 K) and x = 0.3 (TN1 = 65 K). Differential scanning calorimetry (DSC) measurements showed sharp and strong peaks near TOO = 664 K in x = 0 corresponding to an orbital-order (OO) structural transition from I2/m to Im-3 symmetry. DSC anomalies were significantly broadened, and their intensities were significantly reduced in x = 0.1–0.3, and structural transitions were observed near TOO = 630 K in x = 0.1, TOO = 600 K in x = 0.2, and TOO = 570 K in x = 0.3.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: A-site-ordered quadruple perovskites, orbital order, phase separation, high-pressure synthesis

Date published: 2025-11-26

Publisher: MDPI AG

Journal:

• Molecules (ISSN: 14203049) vol. 30 issue. 23 4561

Funding:

• Grant-in-Aid for Scientific Research JP25K01657

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/molecules30234561

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Updated at: 2025-12-16 14:09:42 +0900

Published on MDR: 2025-12-19 14:11:43 +0900