Absence of room temperature ferromagnetism in transition metal doped ZnO nanocrystalline powders from PAC spectroscopy |
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Authors: | R Dogra M R Cordeiro A W Carbonari R N Saxena M S Costa |
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Institution: | 1. Beant College of Engineering and Technology, Gurdaspur, 143 521, India 2. Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, Sao Paulo, Brazil
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Abstract: | Local structural and electronic environment around 111In probe atoms in transition metal doped Zn1???xTxO (T=Mn, Co, V and Ni; x = 0.01, 0.02, 0.05) and Cu co-doped Zn1???xCoxCu0.01O (x = 0.01–0.04) have been monitored on an atomic scale by Perturbed Angular Correlation (PAC) spectroscopy. Single phase nanocrystalline powders were synthesized at low annealing temperatures by sol-gel method. PAC measurements exhibited the well known quadrupole interaction frequency, $\upnu_{\rm Q} =$ 31 MHz, which have been attributed to the substitutional incorporation of 111In in ZnO matrix. PAC results did not reveal any evidence of magnetic ordering down to 77 K in pure and doped ZnO, which is consistent with the recent observation of paramagnetic behavior in transition metal doped ZnO with synchrotron based studies. |
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