Scanning tunneling spectroscopy across the insulator-to-metal transition in strained manganite films

Diplôme Thèse Scanning tunneling spectroscopy across the insulator-to-metal transition in strained manganite films eng 2008-06-26 author Seiro Silvia Susana 560535 director Fischer Oystein 25258 10.13097/archive-ouverte/unige:619 urn:nbn:ch:unige-6197 Sc. 3995 The transition from insulating to metallic-like behavior in La[1-x]Ca[x]MnO[3] (X~0.33) films is studied by scanning tunnelling spectroscopy (STS). The dependence on substrate-induced strain on the transition temperature and the apparent gap measured by transport is characterized for different film thickness. STS measurements on highly and weakly strained films using a home-made setup showed no evidence of a bimodal distribution of zero-bias conductance (ZBC) values, precluding a static phase separation over lengthscales of 10-100 nm. ZBC follows the trend of macroscopic conductivity, increasing (decreasing) on cooling at low (High) temperatures. At high temperatures, ZBC follows an activated behavior and normalized conductance presents a depletion at low energies, features consistent with a gapped density of states. However, the depletion does not disappear on cooling below the transition temperature. A possible explanation in terms of antiferromagnetic/charge order (AFCO) correlations, which are present both in the ferromagnetic and paramagnetic phases, is provided. STM Thin films Manganites Metal-insulator transition Pseudogap Dewey 500.2 33 Département de physique de la matière quantique 131 false a2503692-ba87-499b-8ed7-dd2af163f229 Thesis Public file1.pdf 4407093 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Scanning tunneling spectroscopy across the insulator-to-metal transition in strained manganite films				2008	939	1,065

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Seiro, Silvia Susana