2002
DOI: 10.1103/physrevb.65.134508
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Hall effect inc-axis-orientedMgB2thin films

Abstract: We have measured the longitudinal resistivity and the Hall resistivity in the ab-plane of highly c-axis-oriented MgB2 thin films. In the normal state, the Hall coefficient (RH ) behaves as RH ∼ T with increasing temperature (T ) up to 130 K and then deviates from that linear T -dependence at higher temperatures. The T 2 dependence of the cotangent of the Hall angle is only observed above 130 K. The mixed-state Hall effect reveals no sign anomaly over a wide range of current densities from 10 2 to 10 4 A/cm 2 a… Show more

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Cited by 38 publications
(5 citation statements)
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References 31 publications
(42 reference statements)
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“…However, the Fermi energy assigned by Boeri et al [34] appears related to the distance to the vertex of the parabolic bands and does not correspond to valence electron densities or charge carriers determined experimentally from resistivity measurements and from Drude approximations. For example, measurements of the Hall coefficient for MgB 2 , indicate that the charge carriers are holes with a density of 1.7 -2.8 × 10 23 holes cm −3 at 300 K [27] [36] [37]. In contrast, calculations by Suzuki [38], referred to the vertex of the parabolic bands, estimate a carrier concentration of ~10 22…”
Section: Fermi Energymentioning
confidence: 99%
“…However, the Fermi energy assigned by Boeri et al [34] appears related to the distance to the vertex of the parabolic bands and does not correspond to valence electron densities or charge carriers determined experimentally from resistivity measurements and from Drude approximations. For example, measurements of the Hall coefficient for MgB 2 , indicate that the charge carriers are holes with a density of 1.7 -2.8 × 10 23 holes cm −3 at 300 K [27] [36] [37]. In contrast, calculations by Suzuki [38], referred to the vertex of the parabolic bands, estimate a carrier concentration of ~10 22…”
Section: Fermi Energymentioning
confidence: 99%
“…This observation has become known as 'two lifetime' behavior, because it suggests that different scattering rates control the Hall mobility and the longitudinal resistance, respectively [62]. In addition to the cuprates, lifetime separation has been observed in a wide range of correlated materials, [63], ruthenates [64,65], heavy Fermion systems [66,67], MgB 2 [68], and in oxide heterostructures [57]. Figure 4 shows an example of the two lifetime phenomenon for a high-carrier-density, quasi-two-dimensional electron system at a SmTiO 3 /SrTiO 3 interface that is close to a metal-insulator transition.…”
Section: Hall Mobility or Hall Anglementioning
confidence: 99%
“…However, a clear temperature dependence of R H has been found in the underdoped cuprate superconductors and multiband superconductor MgB 2 . [19][20][21][22] The nonlinear magnetic field dependence of the Hall resistivity xy and rather large MR are also observed in MgB 2 thin films, 23,24 which are attributed to the strong multiband effect. Recently, the multiband behaviors are also revealed in the recently discovered iron-based superconductors by the Hall effect measurements.…”
mentioning
confidence: 90%