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Si-compatible candidates for high- κ dielectrics with the P b n m perovskite structure

2010; American Physical Society; Volume: 82; Issue: 6 Linguagem: Inglês

10.1103/physrevb.82.064101

1550-235X

Sinisa Coh, T. Heeg, J. H. Haeni, Michael D. Biegalski, J. Lettieri, L. F. Edge, Katie O'Brien, M. Bernhagen, P. Reiche, R. Uecker, Susan Trolier‐McKinstry, Darrell G. Schlom, David Vanderbilt,

Magnetic and transport properties of perovskites and related materials

We analyze both experimentally (where possible) and theoretically from first-principles the dielectric tensor components and crystal structure of five classes of Pbnm perovskites. All of these materials are believed to be stable on silicon and are therefore promising candidates for high-K dielectrics. We also analyze the structure of these materials with various simple models, decompose the lattice contribution to the dielectric tensor into force constant matrix eigenmode contributions, explore a peculiar correlation between structural and dielectric anisotropies in these compounds and give phonon frequencies and infrared activities of those modes that are infrared-active. We find that CaZrO_3, SrZrO_3, LaHoO_3, and LaYO_3 are among the most promising candidates for high-K dielectrics among the compounds we considered.