Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Low-field magnetoresistance

This formula has been derived using a different method by Maki and Virosztek [40], who give a correction term that depends on the ratio of tj th, as well as deriving formulas for nonlinear SDW contributions to RH. The low-field magnetoresistance is given by... [Pg.368]

A = Ca +, SP") crystal close to the magnetic Curie temperature. Details of the curve depend on temperature and concentration, (b) The low-field magnetoresistance of... [Pg.271]

Sin] Sinha, G., Barnard, R.D., Majumdar, A.K., Low-field Magnetoresistance in Diverse Phases of 7-Fego xNi cCr2o Alloys , Phys. Rev. B, 55(14), 8982-8989 (1997) (Crys. Structure, Experimental, 17)... [Pg.257]

The magnetoresistance of (EDO-TTFBr2)FeCl4, on the other hand, shows multistep behaviors, as shown in Fig. 9b. In a low-field region, two stepwise... [Pg.91]

Malavasi et al. (2003) prepared nanocrystalline Lai cNaj.Mn03 samples with polyacrylamide-based sol-gel method and propellant synthesis. Both samples showed superparamagnetic behaviors, while the former was more evidenced due to the smaller grain size. An enhanced low-field (< 1 T) magnetoresistance was also observed. [Pg.397]

Colossal magnetoresistance studies of ceramics have demonstrated no significant influence of ceramic density on the magnetoresistance at H = 1.5T. However, ceramics obtained by the solid state synthesis method and containing inclusions of lanthanum-doped manganese oxide displayed substantially higher magnetoresistance values. This effect was later used for directed enhancement of low field... [Pg.600]

In order to understand the electronic transport of a solid, it is necessary to know its charge carrier densities and mobilities. For most solids, the Hall coefficient (Rh) is used to determine the concentration and sign of the majority charge carriers. Once known, the mobility is determined from the conductivity values, a. The MAX phases, however, are unlike most other metallic conductors in that their Hall and Seebeck coefficients are quite small - in some cases vanishingly small - and a weak function of temperature [52, 84—87]. Furthermore, the magnetoresistance (MR) (Aq/q = q(B) — q(B = 0)/q(B = 0)]), where B, the applied magnetic field intensity, is positive, parabolic, and nonsaturating. Said otherwise, the MAX phases are compensated conductors, and a two-band conduction model is needed to understand their electronic transport. In the low-field, B, limit of the two-band model, the... [Pg.307]

J. Nassar, M. Viret, M. Drouet, J.P. Contour, C. Fer-mon, A. Fert Low-field colossal magnetoresistance in manganite tunnel junctions. Mater. Res. Soc. [Pg.1070]

Song et al. [16] reported results relative to a four-point resistivity measurement on a large bundle of carbon nanotubes (60 um diameter and 350 tm in length between the two potential contacts). They explained their resistivity, magnetoresistance, and Hall effect results in terms of a conductor that could be modeled as a semimetal. Figures 4 (a) and (b) show the magnetic field dependence they observed on the high- and low-temperature MR, respectively. [Pg.123]


See other pages where Low-field magnetoresistance is mentioned: [Pg.147]    [Pg.67]    [Pg.272]    [Pg.272]    [Pg.237]    [Pg.196]    [Pg.800]    [Pg.494]    [Pg.262]    [Pg.204]    [Pg.206]    [Pg.147]    [Pg.67]    [Pg.272]    [Pg.272]    [Pg.237]    [Pg.196]    [Pg.800]    [Pg.494]    [Pg.262]    [Pg.204]    [Pg.206]    [Pg.395]    [Pg.121]    [Pg.235]    [Pg.258]    [Pg.88]    [Pg.259]    [Pg.601]    [Pg.365]    [Pg.262]    [Pg.270]    [Pg.1070]    [Pg.233]    [Pg.284]    [Pg.76]    [Pg.238]    [Pg.238]    [Pg.18]    [Pg.19]    [Pg.187]    [Pg.388]    [Pg.394]    [Pg.436]    [Pg.437]    [Pg.111]    [Pg.119]   
See also in sourсe #XX -- [ Pg.272 ]




SEARCH



Low field

Magnetoresistance

Magnetoresistivity

© 2024 chempedia.info