High-Field Galvanomagnetic Effects in Antiferromagnetic Chromium

Arko, A. J.; Marcus, J. A.; Reed, W. A.

doi:10.1103/physrev.176.671

Cited by 42 publications

(15 citation statements)

References 30 publications

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“…For the pockets of holes at the N-points this results in extensive overlapping hole ellipsoids (demonstrated schematically in Fig. 3 below) and, thus, open orbits along the direction of Q SDW that have been detected in magnetoresistance and Hall effect measurements in single domain samples [23,24]. Previous dHvA measurements in Cr revealed a large number of small k-space area orbits caused by the magnetic breakdown between these intersecting hole surfaces.…”

Section: Introductionmentioning

confidence: 76%

Fermi surface ofCr1−xVxacross the quantum critical point

et al. 2010

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We have measured de Haas-van Alphen oscillations of Cr1−xVx, 0 ≤ x ≤ 0.05, at high fields for samples on both sides of the quantum critical point at xc = 0.035. For all samples we observe only those oscillations associated with a single small hole band with magnetic breakdown orbits of the reconstructed Fermi surface evident for x < xc. The absence of oscillations from Fermi surface sheets most responsible for the spin density wave (SDW) in Cr for x > xc is further evidence for strong fluctuation scattering of these charge carriers well into the paramagnetic regime. We find no significant mass enhancement of the carriers in the single observed band at any x. An anomalous field dependence of the dHvA signal for our x = 0.035 crystal at particular orientations of the magnetic field is identified as due to magnetic breakdown that we speculate results from a field induced SDW transition at high fields.

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Section: Introductionmentioning

confidence: 76%

Fermi surface ofCr1−xVxacross the quantum critical point

et al. 2010

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“…The Néel tem- perature appears as a kink in the zero field ρ(T ) curve, as indicated by the dashed arrow, and appears as a dip in dρ/dT shown in the inset to Fig. 8 for 0 T and 1 T. This is reminiscent of the resistivity feature in Cr at T N , where the antiferromagnetism is believed to be itinerant and the kink arises from an energy gap forming on regions of the Fermi surface, leading to a loss of charge carriers and increased resistivity 18 . However, in Cr the magnetoresistance is positive, arising from the additional scattering associated with cyclotron orbits of the electrons around the Fermi surface 18 .…”

Section: Magnetic Field Studymentioning

confidence: 91%

Magnetism and superconductivity inU2PtxRh1−xC2

Wakeham¹,

Ni²,

Bauer³

et al. 2015

Phys. Rev. B

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We report the phase diagram of the doping series U2PtxRh (1−x) C2, studied through measurements of resistivity, specific heat and magnetic susceptibility. The Néel temperature of U2RhC2 of ∼ 22 K is suppressed with increasing Pt content, reaching zero temperature close to x = 0.7, where we observed signatures of increased quantum fluctuations. In addition, evidence is presented that the antiferromagnetic state undergoes a spin-reorientation transition upon application of an applied magnetic field. This transition shows non-monotonic behaviour as a function of x, peaking at around x = 0.3. Superconductivity is observed for x ≥ 0.9, with Tc increasing with increasing x. The reduction in Tc and increase in residual resistivity with decreasing Pt content is inconsistent with the extension of the Abrikosov-Gor'kov theory to unconventional superconductivity.

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“…This can be due to field-induced changes in the nature of a particular orbit, as for magnetic breakdown in elemental Cr, 20 and for intersheet field-dependent scattering in Cd. 21 These effects are normally accompanied by dramatic oscillations in the MR, which we do not observe here.…”

Section: Analysis a Hall Effectmentioning

confidence: 99%

Evidence for two-band magnetotransport in half-metallic chromium dioxide

et al. 2000

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Magnetotransport measurements were made on patterned, ͑110͒ oriented CrO 2 thin films grown by the high-pressure, thermal decomposition of CrO 3 onto rutile substrates. The low-temperature Hall effect exhibits a sign reversal from positive to negative as the magnetic field is increased above 1 T, which may be interpreted within a simple two-band model as indicating the presence of highly mobile ( h ϭ0.25 m 2 /V s) holes as well as a much larger number of less mobile electrons (nϭ0.4 electrons/Cr͒. Between 50 and 100 K, the field at which the sign reversal occurs rapidly increases and a contribution from the anomalous Hall effect becomes significant, while the large, positive transverse magnetoresistance ͑MR͒ observed at low temperatures changes over to a predominantly negative MR. These changes correlate with a thermally activated dependence in the resistivity of the form T 2 e Ϫ⌬/T with ⌬Ϸ80 K, reflecting the lack of temperature dependence in the resistivity at low temperatures and a T 2 behavior above 100 K. The high mobilities at low temperature which result in the observed positive MR reflect the suppression of spin-flip scattering expected for a half-metallic system. However, the changes in magnetotransport above the temperature ⌬ must be due to the onset of spin-flip scattering, even though k B ⌬ is much less than the expected energy gap in the minority spin density of states. The significance of ⌬ is discussed in terms of recent models for another half-metallic system, the perovskite manganites, and the possible formation of ''shadow bands.''

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High-Field Galvanomagnetic Effects in Antiferromagnetic Chromium

Cited by 42 publications

References 30 publications

Fermi surface ofCr1−xVxacross the quantum critical point

Fermi surface ofCr1−xVxacross the quantum critical point

Magnetism and superconductivity inU2PtxRh1−xC2

Evidence for two-band magnetotransport in half-metallic chromium dioxide

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