Magnetoresistance in a well-annealed sample of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">UCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ge</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Nigam, A. K.; Roy, Sthitadhi; Chaddah, P.

doi:10.1103/physrevb.60.3002

Cited by 18 publications

(16 citation statements)

References 17 publications

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“…Figure 7 displays the MR curve measured at 150 K and the fitted curves based on Eq. Therefore, curve 1 reflects the ferromagnetic term that is characterized by the exponential decrease with H. On the other hand, curve 2 represents a paramagnetic contribution delineated as H 2 dependence [28] and subsequently expo- nential decrease with H due to alignment of spins by the applied field. Their derivative data dMR/dH are shown in the inset in order to assess the validity of the fitting parameters.…”

Section: Transport Propertiessupporting

confidence: 90%

Effect of Subsidiary Phase on the Magnetic and Transport Properties of Sr1.6La1.4Mn2O7

Kim

Choi

Nam

et al. 2001

phys. stat. sol. (a)

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Temperature and field dependent magnetic and transport measurements on a polycrystalline sample of Sr 1.6 La 1.4 Mn 2 O 7 reveal distinct magnetic peaks above the ferromagnetic ordering temperature T C % 90 K. The magnetic moment of the subsidiary phases identified as perovskitic impurities by a relation between the volume fraction and the corresponding magnetic moment does not couple with that of Sr 1.6 La 1.4 Mn 2 O 7 in the high temperature range. This is evidenced by the presence of two slopes, dM/dH, in the M(H) curves and two different field dependences, H and H 2 , in the r(H) curves. On the other hand, a simple slope, dM/dH, in the low temperature regime hints at an exchange coupling between the magnetic moments of the two phases.

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Section: Transport Propertiessupporting

confidence: 90%

Effect of Subsidiary Phase on the Magnetic and Transport Properties of Sr1.6La1.4Mn2O7

Kim

Choi

Nam

et al. 2001

phys. stat. sol. (a)

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“…As a result, the electrical resistivity drops sharply accompanied by the transition from antiferromagnetic to ferromagnetic state. In fact, a similar feature of decrease in MR is also observed in some other rare-earth transition metal compounds 31,32 due to the magnetic phase transition from antiferromagnetic to ferromagnetic state.…”

Section: Resultsmentioning

confidence: 61%

Anomalous in-plane magnetoresistance in a EuFe2As2single crystal: Evidence of strong spin-charge-lattice coupling

Xiao

Nandi

et al. 2012

Phys. Rev. B

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In-plane magnetotransport properties of a EuFe 2 As 2 single crystal are investigated by angular-dependent magnetoresistance (MR) measurements. Strong anisotropy in magnetotransport properties is observed below the magnetic ordering temperature and it exhibits intimate correlations with the ordering states of both Eu 2+ and Fe 2+ spins as well as the twinned structure in EuFe 2 As 2 crystal. Such correlations lead to giant MR effect around the magnetic phase boundary, e.g., negative MR of ∼26% is observed at 5 K and 1 T upon the reorientation of Eu 2+ spins from antiferromagnetic to ferromagnetic configuration. Compared with Eu 2+ moments, Fe 2+ moments with antiferromagnetic arrangement generated relatively weak effect on MR due to its small ordered moment. All obtained MR results can be well understood based on the scenario of superzone boundary effect and the electron scattering by fluctuation of spins and twinning boundaries. It also suggests that the magnetic order state plays an important role for the determination of transport properties through the strong coupling between itinerant electrons and ordered spins.

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“…On the second hand, as usually the positive contribution is attributed to the ordinary Lorentz-type scattering and/or the presence in the compound also the antiferromagnetic type of interactions [10]. For example, a rapid decrease in the positive MR with increasing temperature was also observed for UCu 2 Ge 2 , where the system though remains ferromagnetic over the entire range below T C (=107 K) but at low temperatures shows a randomly canted ferromagnetic phase [12,13]. However, owing to the fact that this positive contribution of fairly large value (14.5% at 4.2 K) depends strongly on applied magnetic field, one must search for other mechanisms, which have not been determined at present.…”

Section: Electrical Transportmentioning

confidence: 88%