Volume 52, Number 6, December II 2000
|Page(s)||674 - 680|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Relaxation between charge order and ferromagnetism in manganites: Indication of structural phase separation
Department of Physics and Astronomy, Rutgers University Piscataway, NJ 08854, USA
2 Department of Physics, Faculty of Engineering, Yokohama-National University tokiwadai 79-5, hodogaya-ku, Yokohama 240-8501 Japan
3 Bell Laboratories, Lucent Technologies - Murray Hill, NJ 07974, USA
Accepted: 11 October 2000
We have investigated two regions of manganite phase space; one where ferromagnetic (FM), metallic and charge-ordered (CO), insulating phases become the ground and high-temperature states, respectively, and the other with the reversed order. We found that the coexistence of FM and CO phases in broad temperature ranges can be drastically influenced by cooling rate and also aging, showing the presence of slow relaxation. Our results can be understood in terms with free energy analysis combined with long-range, anisotropic strain consideration, indicating that the coexistence of the distinct electronic phases is structural in origin.-1
PACS: 75.30.Vn – Colossal magnetoresistance / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 64.75.+g – Solubility, segregation, and mixing; phase separation
© EDP Sciences, 2000
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