Anomalous room temperature magnetoresistance in brownmillerite Ca2Fe2O5

被引：30

作者：

Dhankhar, Suchita ^{[1
]}

Gupta, Kapil ^{[2
]}

Bhalerao, Gopal ^{[3
]}

Shukla, Neeraj ^{[3
]}

Chandran, Maneesh ^{[4
]}

Francis, Bellarmine ^{[2
]}

Tiwari, Brajesh ^{[5
]}

Baskar, K. ^{[1
]}

Singh, Shubra ^{[1
]}

机构：

[1] Anna Univ, Ctr Crystal Growth, Madras 600025, Tamil Nadu, India

[2] Indian Inst Technol, Dept Phys, Madras 600036, Tamil Nadu, India

[3] UGC DAE CSR Kalpakkam Node, Kokilamedu 603104, India

[4] Technion Israel Inst Technol, Schulich Fac Chem, IL-32000 Haifa, Israel

[5] Sardar Vallabhbhai Natl Inst Technol, Dept Appl Phys, Surat 395007, India

来源：

RSC ADVANCES | 2015年 / 5卷 / 112期

关键词：

MAGNETIC-STRUCTURES; THIN-FILMS; DIFFRACTION; MICROSCOPY; FERRITE; CATHODE; SOFCS; XPS;

D O I：

10.1039/c5ra16955k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We demonstrate the hitherto unreported field induced magnetoresistance in wet chemical synthesized bulk polycrystalline brownmillerite Ca2Fe2O5. A magnetoresistance of 12% is observed at room temperature, well below its antiferromagnetic transition temperature of 775 K. The variation in resistivity with increasing and decreasing magnetic field shows a significant memory effect. When synthesized in a nanostructured form it exhibits weak ferromagnetism due to the appearance of an Fe oxide phase, besides exhibiting a shift to a higher antiferromagnetic Neel temperature of 820 K. Spectroscopic investigations (X-ray photoelectron and Raman spectroscopy) as well as magnetic measurements have been employed to investigate the above behavior of brownmillerite Ca2Fe2O5.

引用

页码：92549 / 92553

页数：5

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