Choudhury, Debraj and Venimadhav, Adyam and Kakarla, Chandrasekhar and Delaney, Kris T and Sujatha Devi, P and Mondal, P and Nirmala, R and Gopalakrishnan, J and Spaldin, Nicola A and Waghmare, Umesh V and Sarma, D D (2010) Unusual dielectric response in B-site size-disordered hexagonal transition metal oxides. APPLIED PHYSICS LETTERS, 96 (16). Article No.-162903. ISSN 0003-6951

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We discover that hexagonal holmium copper titanate (Ho(2)CuTiO(6)), has a unique and highly desirable combination of high dielectric constant, low losses, very small temperature coefficient, and low frequency dependence. Our first-principles calculations indicate that these exceptional properties result from a size-difference at the Cu/Ti B-site that suppresses the expected ferroelectric transition, combined with the dominance of intermediate-frequency polar vibrational modes in the dielectric response. Our results suggest that the use of such B-site disorder in alloys of hexagonal transition-metal oxides should generally result in similar robust dielectrics. (C) 2010 American Institute of Physics. [doi:10.1063/1.3379293]

Item Type: Article
Subjects: Electronics
Depositing User: Bidhan Chaudhuri
Date Deposited: 09 Feb 2012 10:37
Last Modified: 09 Feb 2012 10:37

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