Resistivity and Magnetoresistance of Dilute Solutions of Mn in Cu-Ni Alloys

Harvey, Andrew R.; Legvold, S.; Peterson, D.T.

doi:10.1103/physrevb.4.4003

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…Harvey et al (15) continued the investigation by measuring the resistivity and magnetoresistance of Cu-Ni (Mn) alloys with concentra tions comparable to those in Gartner's study. They found that the impurity contribution to the resistivity and magnetoresistance were proportional to the Mn concentration and were essentially independent of the Ni concentration.…”

Section: Information To Usersmentioning

confidence: 99%

Resistivity and Magnetoresistance of Dilute Solutions of Cr in Cu-Ni Alloys

Eagen

Legvold

1972

Phys. Rev. B

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Section: Information To Usersmentioning

confidence: 99%

Resistivity and Magnetoresistance of Dilute Solutions of Cr in Cu-Ni Alloys

Eagen

Legvold

1972

Phys. Rev. B

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“…Sample area of the resistivity sample holder (15) In this equation p is the resistivity, A is the cross sectional area of the sample, L is the length of the sample between the emf probes, I is the current flowing through the sample, and V is the emf along the sample which is a function of the temperature, T. That is, if we know that the emf at temperature T^ differs from the calibration curve by an amount and at Tg it differs by Vg, then at any temperature T that lies between Tj and Tg we assume the emf will differ from the calibration curve by an amount…”

Section: Resistivity Measurementsmentioning

confidence: 99%

Resistivity and magnetoresistance of dilute solutions of Cr in Cu-Ni alloys

Eagen

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“…Several explanations have been proposed to describe the occurrence of negative magnetoresistance. In magnetic materials it can originate from spin-dependent scattering of conduction electrons from localised magnetic moments such as in dilute metallic alloys [141,142]. This phenomenon also occurs for ferromagnets [7,139,143] and in semiconducting films [144].…”

Section: Magnetoresistancementioning

confidence: 99%

Investigation of the electron and thermal transport in rare-earth nitrides

Maity¹

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<p>Gadolinium nitride (GdN) and samarium nitride (SmN) have been widely studied to understand their ferromagnetic ordering and electronic structure, and for their promise in spintronics applications. This thesis presents experimental magnetotransport studies of GdN and SmN films in which experimental results have been compared with the existing band structure calculation. Three GdN films have been prepared in different conditions, among them two films are epitaxial quality and one film is polycrystalline in nature, and two films of SmN were also studied. Their magnetic properties were probed by SQUID magnetometry and they are found to be ferromagnetic. The transition temperature differs from sample to sample and this behaviour has been attributed to the presence of magnetic polarons that nucleate around nitrogen vacancies and give rise to an inhomogeneous ferromagnetic state. The charge transport results have been discussed for all GdN and SmN films. A full set of charge/heat transport results are obtained on only one epitaxial GdN. The difference of resistivity among these samples is noticeable. The Hall effect results show the presence of different carrier concentration with at most only weak temperature dependence. We also have noticed the presence of anomalous Hall effect in the paramagnetic region for a lower-concentration epitaxial GdN. The thermopower in both GdN and SmN was measured to provide further insight into the material’s electronic properties. In this thesis we present the first experimental investigation of the thermopower of epitaxial gadolinium nitride and samarium nitride films, measured using an experimental set-up designed for measuring the temperature dependent thermopower of thin films. Our result shows a negative thermopower for both GdN and SmN films and simple, though strong temperature dependence. At low temperatures we observe a peak near the ferromagnetic transition temperature in GdN. The results are interpreted in terms of the diffusion thermopower. Overall the results suggest that the nitrogen vacancy concentration controls the carrier concentration and plays a significant role towards the transport properties. We conclude that all films are either heavily, moderately or weakly doped semiconductors with a metallic characteristic.</p>

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Resistivity and Magnetoresistance of Dilute Solutions of Mn in Cu-Ni Alloys

Cited by 7 publications

References 28 publications

Resistivity and Magnetoresistance of Dilute Solutions of Cr in Cu-Ni Alloys

Resistivity and Magnetoresistance of Dilute Solutions of Cr in Cu-Ni Alloys

Resistivity and magnetoresistance of dilute solutions of Cr in Cu-Ni alloys

Investigation of the electron and thermal transport in rare-earth nitrides

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