ISSN:
1434-6036
Keywords:
PACS. 71.38.+i Polarons and electron-phonon interactions - 73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects) - 75.30.Vn Colossal magnetoresistance
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: We measured the temperature dependence of the linear high field Hall resistivity of ( K) and ( K) thin films in the temperature range from 4 K up to 360 K in magnetic fields up to 20 T. At low temperatures we find a charge-carrier density of 1.3 and 1.4 holes per unit cell for the Ca- and Sr-doped compound, respectively. In this temperature range electron-magnon scattering contributes to the longitudinal resistivity. At the ferromagnetic transition temperature a dramatic drop in the number of charge-carriers n down to 0.6 holes per unit cell, accompanied by an increase in unit cell volume, is observed. Corrections of the Hall data due to a non saturated magnetic state will lead a more pronounced charge-carrier density collapse.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510051059
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