Nonmonotonic crossover in electronic phase separated manganite superlattices driven by the superlattice period
- Fudan Univ., Shanghai (China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Chinese Academy of Sciences (CAS), Ningbo (China)
- Southeast Univ., Nanjing (China)
- Nanjing Univ. (China)
- Univ. of Nebraska, Lincoln, NE (United States)
- Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Fudan Univ., Shanghai (China); Nanjing Univ. (China)
Studying manganite superlattices [(LCMO)2n / (PCMO)n]t made of La0.625Ca0.375MnO3 (LCMO) and Pr0.625Ca0.375MnO3 (PCMO), we found an unexpected behavior varying the period n. At small n, the ensemble is a three-dimensional ferromagnetic metal due to interfacial charge transfer. At large n , the LCMO layers dominate transport. However, rather than a smooth interpolation between these limits a sharp transport and magnetic anomaly is found at an intermediate critical PCMO thickness n*. Magnetic force microscopy reveals that the phase-separation length scale also maximizes at n* where, unexpectedly, it becomes comparable to that of the (La1-yPry)0.625Ca0.375MnO3 (LPCMO) alloy. Finally, we conjecture the phenomenon originates in a disorder-related length scale: Large charge-ordered clusters as in LPCMO can only nucleate when Pr-rich regions reach a critical size related to n*.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Key Research Program of China; National Basic Research Program of China; National Natural Science Foundation of China (NSFC); Shanghai Municipal Natural Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; 2016YFA0300702; 2014CB921104; 11504053; 11904052; 18XD1400600; 17ZR1442600; 18JC141140; 18ZR1403200; AC05-00OR22725
- OSTI ID:
- 1756297
- Alternate ID(s):
- OSTI ID: 1822086
- Report Number(s):
- BNL-220775-2021-JAAM; TRN: US2205619
- Journal Information:
- Physical Review B, Vol. 102, Issue 23; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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