In situ study of the effect of temperature on the electronic structure of NixMn3−xO4+δ thin films using scanning tunneling spectroscopy | Zendy

Arnab Basu | Zendy; A.W. Brinkman | Zendy; Z. Klusek | Zendy; P.K. Datta | Zendy; P.J. Kowalczyk | Zendy

Open Access

In situ study of the effect of temperature on the electronic structure of NixMn3−xO4+δ thin films using scanning tunneling spectroscopy

Author(s) -

Arnab Basu,

A.W. Brinkman,

Z. Klusek,

P.K. Datta,

P.J. Kowalczyk

Publication year - 2002

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.1505690

Subject(s) - spinel , atmospheric temperature range , condensed matter physics , fermi level , materials science , scanning tunneling spectroscopy , quantum tunnelling , spectroscopy , variable range hopping , electrical resistivity and conductivity , scanning tunneling microscope , local density of states , temperature coefficient , density of states , range (aeronautics) , analytical chemistry (journal) , chemistry , thermal conduction , physics , thermodynamics , metallurgy , quantum mechanics , chromatography , composite material , electron

NixMn3–xO4 + (0.4x1) are a series of cubic-spinel-structured material exhibiting a negative temperature coefficient of resistance. The resistance as a function of temperature (T) has been measured from 20 to 200 °C and the data have been fitted to a variable range hopping model in which the resistivity is described as = 0T exp(T0/T)0.5 where T0 was found to be 2.24×105 K. Scanning tunneling spectroscopy measurements were carried out over the temperature range of 20–300 °C, to study the shape of the local density of states (LDOS). Such measurements have not been carried out on this class of spinel structured materials before. The distribution of the LDOS around the Fermi level was parabolic in agreement with the model of variable range hopping. The evolution of a peak around 1.8 eV was observed with increasing temperature and found to be completely reversible with temperature

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