TY - JOUR
T1 - Large magnetoresistance in double perovskite Sr2Cr1.2Mo0.8O6-δ
AU - Zeng, Z.
AU - Fawcett, I. D.
AU - Greenblatt, M.
AU - Croft, M.
N1 - Funding Information:
We thank Prof. K.V. Ramanujachary for his suggestions with experimental problems and useful discussions and Prof. W.H. McCarroll for his critical reading of the manuscript. This work was supported by National Science Foundation-Solid State Chemistry Grant DMR-96–13106.
PY - 2001/2
Y1 - 2001/2
N2 - Sr2Cr1.2Mo0.8O6-δ (δ=0, 0.2) with a double perovskite structure was prepared by solid state reaction in evacuated quartz tubes. Cr and Mo are partially ordered on the B site. Oxygen vacancies decrease the ordering, but increase the lattice parameters. X-ray absorption spectroscopy results are consistent with Cr being 3+, and Mo being close to 5+ for δ = 0.2 and 5.5 for δ = 0. The spin of Cr3+ (d3) and Mo5+ (d1) order in an anti-parallel arrangement by superexchange interaction, and lead to ferrimagnetic ordering below 465 K. Both compounds are n-type narrow gap semiconductors. Large magnetoresistance (-43%) is observed in Sr2Cr1.2Mo0.8O6. The MR behavior is attributed to an intra-grain tunneling mechanism.
AB - Sr2Cr1.2Mo0.8O6-δ (δ=0, 0.2) with a double perovskite structure was prepared by solid state reaction in evacuated quartz tubes. Cr and Mo are partially ordered on the B site. Oxygen vacancies decrease the ordering, but increase the lattice parameters. X-ray absorption spectroscopy results are consistent with Cr being 3+, and Mo being close to 5+ for δ = 0.2 and 5.5 for δ = 0. The spin of Cr3+ (d3) and Mo5+ (d1) order in an anti-parallel arrangement by superexchange interaction, and lead to ferrimagnetic ordering below 465 K. Both compounds are n-type narrow gap semiconductors. Large magnetoresistance (-43%) is observed in Sr2Cr1.2Mo0.8O6. The MR behavior is attributed to an intra-grain tunneling mechanism.
KW - A. Magnetic materials
KW - B. Chemical synthesis
KW - C. Electronic conductivity
KW - C. XANES
KW - D. Magnetic properties
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U2 - 10.1016/S0025-5408(01)00520-7
DO - 10.1016/S0025-5408(01)00520-7
M3 - Article
AN - SCOPUS:0035245513
SN - 0025-5408
VL - 36
SP - 705
EP - 715
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 3-4
ER -