Nonmonotonic crossover in electronic phase separated manganite superlattices driven by the superlattice period

Zhu, Yinyan; Ye, Biying; Li, Qiang; Liu, Hao; Miao, Tian; Wu, Lijun; Li, Lei; Lin, Lingfang; Zhu, Yi; Zhang, Zhe; Shi, Qian; Yang, Yulong; Du, Kai; Bai, Yu; Yu, Yang; Guo, Hangwen; Wang, Wenbin; Xu, Xiaoshan; Wu, Xiaoshan; Zhong, Zhicheng; Dong, Shuai; Zhu, Yimei; Dagotto, Elbio; Yin, Lifeng; Shen, Jian

doi:10.1103/physrevb.102.235107

Title: Nonmonotonic crossover in electronic phase separated manganite superlattices driven by the superlattice period

Journal Article · 02 December 2020 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.102.235107 · OSTI ID:1756297

^[1]; Ye, Biying ^[1]; Li, Qiang ^[1]; Liu, Hao ^[1]; Miao, Tian ^[1];

^[2]; Li, Lei ^[3]; Lin, Lingfang ^[4]; Zhu, Yi ^[1]; Zhang, Zhe ^[5]; Shi, Qian ^[1]; Yang, Yulong ^[1]; Du, Kai ^[1]; Bai, Yu ^[1];

^[1]; Guo, Hangwen ^[1]; Wang, Wenbin ^[1];

^[6]; Wu, Xiaoshan ^[5]; Zhong, Zhicheng ^[3] more »

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 La_0.625Ca_0.375MnO₃ (LCMO) and Pr_0.625Ca_0.375MnO₃ (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 (La_1-yPr_y)_0.625Ca_0.375MnO₃ (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*.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Basic Research Program of China; National Key Research Program of China; National Natural Science Foundation of China (NNSFC); Shanghai Municipal Natural Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 1756297

Report Number(s):: BNL--220775-2021-JAAM

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 23 Vol. 102; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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