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Article Dans Une Revue Applied Physics Letters Année : 2015

Transport properties and c/a ratio of V2O3 thin films grown on C- and R-plane sapphire substrates by pulsed laser deposition

Résumé

We prepared V2O3 thin films on C- or R-plane sapphire (Al2O3) substrates by a pulsed laser deposition method. X-ray diffraction analyses confirmed that single-phase V2O3 films were epitaxially grown on both C- and R-planes under an Ar gas ambient of 2 × 10−2 mbar at a substrate temperature of 873 K. Depending on the deposition conditions, c/a ratios at room temperature of (0001)-oriented V2O3 films widely ranged from 2.79 to 2.88. Among them, the films of 2.81 ≤ c/a ≤ 2.84 showed complex metal (M)–insulator (I)–M transition during cooling from 300 to 10 K, while those of larger c/a ratios were accompanied by metallic properties throughout this temperature range. All the films on R-plane substrates underwent simple M-I transition at ∼150 K, which was more abrupt than the films on C-plane, whereas their c/a ratios were narrowly distributed. The distinct difference of M-I transition properties between C- and R-plane films is explained by the intrinsic a- and c-axes evolution through the transition from M to I phases.
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hal-01757206 , version 1 (03-04-2018)

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Joe Sakai, Patrice Limelette, Hiroshi Funakubo. Transport properties and c/a ratio of V2O3 thin films grown on C- and R-plane sapphire substrates by pulsed laser deposition. Applied Physics Letters, 2015, 107 (24), pp.241901. ⟨10.1063/1.4937456⟩. ⟨hal-01757206⟩
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