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College Park, Maryland      June 6 - 10 , 2004

TP68: Electronic transport and magnetic properties of the natural spin valve Mn0.25NbS2

C.J. Metting, S.E. Lofland (Dept. of Physics and Astronomy, Rowan University, Glassboro, NJ), K.V. Ramanujachary (Dept. of Chemistry and Biochemistry, Rowan University, Glassboro, NJ), J.D. Hettinger (Dept. of Physics and Astronomy, Rowan University, Glassboro, NJ), J.W. Lynn (NIST Center for Neutron Research, Gaithersburg, MD)

We have completed magnetotransport, magnetization, and neutron diffraction studies on polycrystalline and single crystal samples of Mn1/4NbS2. These metallic intercalated compounds, which alternate between four NbS2 layers and one layer of Mn, show ferromagnetic order below 100 K which is accompanied by sizeable (> 15 %) magnetoresistance in polycrystalline material. However, the magnetoresistance along the a axis, parallel to the ferromagnetic Mn layers, is very small in the single crystals. Thus it appears that the large magnetoresistance in the polycrystalline material is a result of transport along the c axis, through the Mn layers which act as natural spin valves between the conducting NbS2 layers.

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