Structural, transport and optical properties of (La0.6Pr0.4)0.65Ca0.35MnO3 nanocrystals: a wide band-gap magnetic semiconductor

被引：46
作者：
Kumar, Satyam [1 ]
Dwivedi, G. D. [2 ]
Kumar, Shiv [1 ]
Mathur, R. B. [3 ]
Saxena, U. [4 ]
Ghosh, A. K. [1 ]
Joshi, Amish G. [3 ]
Yang, H. D. [2 ]
Chatterjee, Sandip [5 ]
机构：
[1] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India
[2] Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 80424, Taiwan
[3] CSIR, Natl Phys Lab, New Delhi 110012, India
[4] Banaras Hindu Univ, Mahila Mahavidyalaya, Dept Phys, Varanasi 221005, Uttar Pradesh, India
[5] Banaras Hindu Univ, Indian Inst Technol, Dept Phys, Varanasi 221005, Uttar Pradesh, India
来源：
DALTON TRANSACTIONS | 2015年 / 44卷 / 07期
关键词：
NEUTRON-DIFFRACTION; DOUBLE EXCHANGE; THIN-FILMS; MAGNETORESISTANCE; CHARGE; PR1-XCAXMNO3; RESISTIVITY; MANGANITES; STRAIN; RAMAN;
D O I：
10.1039/c4dt03452j
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
(La0.6Pr0.4)(0.65)Ca0.35MnO3 system has been synthesized via a sol-gel route at different sintering temperatures. Structural, transport and optical measurements have been carried out to investigate (La0.6Pr0.4)(0.65)Ca0.35MnO3 nanoparticles. Raman spectra show that Jahn-Teller distortion has been decreased due to the presence of Ca and Pr in A-site. Magnetic measurements provide a Curie temperature around 200 K and saturation magnetization (MS) of about 3.43 mu(B)/Mn at 5 K. X-ray photoemission spectroscopy study suggests that Mn exists in a dual oxidation state (Mn3+ and Mn4+). Resistivity measurements suggest that charge-ordered states of Mn3+ and Mn4+, which might be influenced by the presence of Pr, have enhanced insulating behavior in (La0.6Pr0.4)(0.65)Ca0.35MnO3. Band gap estimated from UV-Vis spectroscopy measurements comes in the range of wide band gap semiconductors (similar to 3.5 eV); this makes (La0.6Pr0.4)(0.65)Ca0.35MnO3 a potential candidate for device application.
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收藏
页码：3109 / 3117
页数：9
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