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We report a new diluted ferromagnetic semiconductor Li 1+y (Cd,Mn)P, wherein carrier is doped via excess Li while spin is doped by isovalence substitution of Mn 2+  into Cd 2+ . The extended Cd 4 d -orbitals lead to more itinerant characters of Li 1+y (Cd,Mn)P than that of analogous Li 1+y (Zn,Mn)P. A higher Curie temperature of 45 K than that for Li 1+y (Zn,Mn)P is obtained in Li 1+y (Cd,Mn)P polycrystalline samples by Arrott plot technique. The p-type carriers are determined by Hall effect measurements. The first principle calculations and X-ray diffraction measurements indicate that occupation of excess Li is at Cd sites rather than the interstitial site. Consequently holes are doped by excess Li substitution. More interestingly Li 1+y (Cd,Mn)P shows a very low coercive field (<100 Oe) and giant negative magnetoresistance (~80%) in ferromagnetic state that will benefit potential spintronics applications.

Li(Cd,Mn)P: a new cadmium based diluted ferromagnetic semiconductor with independent spin & charge doping