Magnetotransport in conducting composite films with a disordered columnar microstructure and an in-plane magnetic field

Bergman, David J.; Strelniker, Yakov M.

doi:10.1103/physrevb.60.13016

Cited by 63 publications

(46 citation statements)

References 40 publications

(57 reference statements)

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“…[10][11][12] Other calculations show that the MR also depends strongly on the shape of the conducting inclusions and therewith on the microstructure of the compound. [13][14][15] Above the percolation threshold, when conducting inclusions in an insulating matrix form a continuous network, the magnetoresistance is asymptotically proportional to the magnetic field. 16 Another theoretical explanation was proposed by Abrikosov 17 as a quantum magnetoresistance for a twocomponent system with a zero band gap of the semiconducting matrix.…”

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Linear magnetoresistance inAg2+δSethin films

et al. 2009

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In the nonstoichiometric low-temperature phase of silver selenide a very small silver excess within the semiconducting silver selenide matrix in the order of 0.01% is sufficient to generate a linear magnetoresistance ͑LMR͒ of more than 300% at 5 T, which does not saturate at fields up to 60 T. Different theoretical models have been proposed to explain this unusual magnetoresistance ͑MR͒ behavior, among them a random resistor network consisting of four-terminal resistor units. According to this model the LMR and the crossover field from linear to quadratic behavior are primarily controlled by both the spatial distribution of the charge-carrier mobility and its average value, being essentially functions of the local and average compositions. Here we report measurements on silver-rich thin Ag x Se films with a thickness between 20 nm and 2 m, which show an increasing average mobility in conjunction with an enhanced MR for increasing film thickness. We found a linear scaling between the size of the transverse LMR and the crossover field, as predicted by the theory. For films thinner than about 100 nm the MR with field directed in the sample plane shows a breakdown of the LMR, revealing the physical length scale of the inhomegeneities in thin Ag x Se devices.In any class of conducting material the relative change in resistance ⌬ / in a magnetic field usually is far from linear and saturates at high fields. As exceptions some polycrystalline metals such as potassium or indium show a nonsaturating linear magnetoresistance ͑MR͒ ͑LMR͒, caused by macroscopic voids or inhomogeneities. This effect is rather small and the linear behavior is only found at large fields of about 1 T, 1,2 so these materials did not stimulate any thoughts of magnetic sensor applications. This changed when a large and nonsaturating LMR was found in Ag x Se and Ag x Te with linear characteristics down to 10 −4 T, leading to intense research activities. [3][4][5][6][7][8] The first approach for the explanation of this unusual behavior can be found already several years ago in the theory of Stroud, 9 who calculated the resistance of a two-phase mixture by the resistance of its single components. At certain volume fractions of the components the increase in resistance does not saturate with increasing magnetic field but is linear. [10][11][12] Other calculations show that the MR also depends strongly on the shape of the conducting inclusions and therewith on the microstructure of the compound. 13-15 Above the percolation threshold, when conducting inclusions in an insulating matrix form a continuous network, the magnetoresistance is asymptotically proportional to the magnetic field. 16 Another theoretical explanation was proposed by Abrikosov 17 as a quantum magnetoresistance for a twocomponent system with a zero band gap of the semiconducting matrix.An alternative classical approach reduced on the spatial distribution of the charge-carrier mobility and its average value was presented by Parish and Littlewood ͑PL͒. 18,19 They found that in a two-dimens...

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Linear magnetoresistance inAg2+δSethin films

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“…[1] a surprising physical phenomenon was discovered which appears in classical metal/insulator or metal/superconductor composite media with three-dimensional (3D) periodic microstructures, when subject to a strong, externally applied magnetic field. When the field is strong enough, i.e., when the Hall-to-Ohmic resistivity ratio is greater than 1 in at least one constituent of the composite medium, then the magneticfield-dependence of the electrical conductivity of the metallic constituent leads to a strong dependence of the macroscopic resistivity of the composite medium on the strength and direction of the magnetic field with respect to the periodic lattice and the direction of the average current density or average applied electric field [1][2][3][4][5][6][7][8][9][10][11][12][13]. Some of these theoretical predictions are already verified experimentally (see Refs.…”

Section: Introductionmentioning

confidence: 99%

Numerical and analytic results for the macroscopic magneto-transport of three-dimensional periodic composites

Strelniker

Bergman

2009

Journal of Magnetism and Magnetic Materials

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“…Unfortunately materials like Ag, Au, Al, traditionally used in extraordinary light transmission studies, can not be used for such magnetic field sensitive devices, since in such materials the dimensionless magnetic field H ≡ ω c τ = μB is very small due to low electron mobility μ (here ω c = eB/me is the cyclotron frequency, τ is the conductivity relaxation time, B is the magnetic field measured in conventional unites 10,11,13,16,[32][33][34][35][36][37][38][39][40]. In order to see the effect of a static magnetic field on the value of the plasmon frequency ω p , in Ref.…”

Section: Introductionmentioning

confidence: 99%

Manipulating the optical transparency of anisotropic metamaterials with magnetic field and liquid crystals: influence of the nanostructures shape

et al. 2009

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The light transmission through metallic films with different types of nano-structures was studied both theoretically and experimentally. It is shown, analytically, numerically and experimentally, that the positions of the surface plasmon resonances depend on nano-structural details. This leads to a strong dependence of the amplitude of the light transmission, as well as the polarization of the transmitted light and other optical properties, on those details. Two complementary situations are considered: a metal film with dielectric holes and a dielectric film with metallic islands. Two different possibilities for manipulating the light transmission are considered: One is based upon application of a static magnetic field (actually, this is equivalent to changing the nano-structure in a transformed configuration space), the other is based upon using liquid crystals as one of the constituents of a nano-structured film.

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Magnetotransport in conducting composite films with a disordered columnar microstructure and an in-plane magnetic field

Cited by 63 publications

References 40 publications

Linear magnetoresistance inAg2+δSethin films

Linear magnetoresistance inAg2+δSethin films

Numerical and analytic results for the macroscopic magneto-transport of three-dimensional periodic composites

Manipulating the optical transparency of anisotropic metamaterials with magnetic field and liquid crystals: influence of the nanostructures shape

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