Anomalous magnetoresistance in
[ Sr2Bi2-xPbxO4] 
RS[ CoO2] y  (x = 0, 0.3,
and 0.4; y ≈ 1.85) single crystals

Luo, Xiaoguang; Chen, X. H.; Wang, G. Y.; Wang, C. H.; Li, Xin; Wu, Gang; Xiong, Yimin

doi:10.1140/epjb/e2006-00027-y

Cited by 21 publications

(27 citation statements)

References 30 publications

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“…As reported previously, 11,13,15,16 high-purity Bi 2 O 3 , PbO, SrCO 3 , and Co 3 O 4 powders were used as raw materials and mixed with an atomic ratio of Bi:Pb:Sr:Co= 2 − x : x :2:2 ͑x = 0.6͒. The resulting powder was mixed and crushed in an agate mortar and then preheated at 800°C in air for 24 h. After cooling to room temperature the resultant mixture was ground again and mixed carefully with additional Bi 2 O 3 flux.…”

Section: Methodssupporting

confidence: 78%

“…On the other hand, ͑Bi, Pb͒-Sr-Co-O is the first example that shows ferromagnetic long-range order in two-dimensional conducting CoO 2 layers. 4,11,14,15 The Pb substitution and misfit-layered structure play an important role in understanding the origin of these peculiar physical properties. The studies of Yamamoto et al 16 and Leligny et al [17][18][19] suggested that the ͑Bi, Pb͒-Sr-Co-O system has a misfit-layered structure between the hexagonal CoO 2 layer and rock-salt Bi 2 Sr 2 O 4 layer.…”

Section: Introductionmentioning

confidence: 99%

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Raman-scattering study of misfit-layered (Bi, Pb)-Sr-Co-O single crystal

Yuan

et al. 2007

Journal of Applied Physics

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Polarized Raman scattering measurements were performed on misfit-layered thermoelectric Bi2−xPbxSr2Co2Oy(x=0.6) single crystal from 20 K to room temperature. Four peaks were observed in the parallel polarization channel and no peaks in the cross polarization channel. One of the Raman peaks carries the asymmetric characteristic, which can be regarded as an evidence of the existence of electron-phonon coupling. Furthermore, the asymmetric parameter, proportional to the strength of electron-phonon coupling, was estimated with the asymmetric Breit–Wigner–Fano line shape. The electron-phonon coupling may play an important role in understanding the large thermoelectric power of cobalt based materials.

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Section: Methodssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Raman-scattering study of misfit-layered (Bi, Pb)-Sr-Co-O single crystal

Yuan

et al. 2007

Journal of Applied Physics

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“…The anisotropy ρ c /ρ ab increases with decreasing temperature, similar to that observed in the (Bi,Pb) 2 Sr 2 Co 2 O y crystals. [13] Strongly temperature-dependent anisotropy indicates that scattering mechanism is different between in-plane and along c-axis, suggesting a quasi twodimensional electronic structure.…”

Section: Methodsmentioning

confidence: 99%

“…[12] It has been found by us that there coexist large negative and positive contributions to the nonmonotonic magnetic-field dependent MR in Pb-doped Bi 2 Sr 2 Co 2 O y . [13] Spin-dependent charge transport has been taken into account for understanding the large negative MR in Sr and Ca compounds, but the large positive MR in Ba compounds has not been fully understood. In polycrystalline Bi 2 Ba 2 Co 2 O y sample, Hervieu et al reported that the positive isothermal MR exhibits a linear H dependence.…”

Section: Introductionmentioning

confidence: 99%

Transport properties and magnetic-field-induced localization in the misfit cobaltite [Bi₂Ba_1.3K_0.6Co_0.1O₄]^RS[CoO₂]_1.97single crystal

Luo¹,

Chen²,

Wang³

et al. 2008

J. Phys.: Condens. Matter

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Resistivity under magnetic field, thermopower and Hall coefficient are systematically studied for the [Bi2Ba1.3K0.6Co0.1O4]RS[CoO2]1.97 single crystal. In-plane resistivity (ρab(T)) shows metallic behavior down to 2 K with a T2 dependence below 30 K, while out-of-plane resistivity (ρc(T)) shows metallic behavior at high temperature and a thermal activation semiconducting behavior below about 12 K. The striking feature is that magnetic field induces a ln(1/T) diverging behavior in both ρab and ρc(T) at low temperature. The positive magnetoresistance (MR) could be well fitted by the formula based on multiband electronic structure. The ln(1/T) diverging behavior in ρab and ρc(T) could arise from the magnetic-field-induced 2D weak localization or spin density wave.

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“…In many works, the MacDonald formula 22 has been used to study the current-noise spectra. [23][24][25] Effective in situ manipulation of quantum conductors is a key step for further development. Using a time-dependent field to manipulate the dynamics of quantum dots promises to be advantageous in situations ranging from photonassisted inelastic tunneling 26 to quantum pumping.…”

Section: Introductionmentioning

confidence: 99%

Noise spectra of ac-driven quantum dots: Floquet master-equation approach

Timm

2010

Phys. Rev. B

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We study the transport properties of a quantum dot driven by either a rotating magnetic field or an ac gate voltage using the Floquet master-equation approach. Both types of ac driving lead to photon-assisted tunneling where quantized amounts of energy are exchanged with the driving field. It is found that the differentialconductance peak due to photon-assisted tunneling does not survive in the Coulomb-blockade regime when the dot is driven by a rotating magnetic field. Furthermore, we employ a generalized MacDonald formula to calculate the time-averaged noise spectra of ac-driven quantum dots. Besides the peak at zero frequency, the noise spectra show additional peaks or dips in the presence of an ac field. For the case of an applied ac gate voltage, the peak or dip position is fixed at the driving frequency whereas the position changes with increasing amplitude for the case of a rotating magnetic field. Additional features appear in the noise spectra if a dc magnetic field is applied in addition to a rotating field. In all cases, the peak or dip positions can be understood from the energy differences of two available Floquet channels.

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Anomalous magnetoresistance in [ Sr2Bi2-xPbxO4] RS[ CoO2] y (x = 0, 0.3, and 0.4; y ≈ 1.85) single crystals

Cited by 21 publications

References 30 publications

Raman-scattering study of misfit-layered (Bi, Pb)-Sr-Co-O single crystal

Raman-scattering study of misfit-layered (Bi, Pb)-Sr-Co-O single crystal

Transport properties and magnetic-field-induced localization in the misfit cobaltite [Bi₂Ba_1.3K_0.6Co_0.1O₄]^RS[CoO₂]_1.97single crystal

Noise spectra of ac-driven quantum dots: Floquet master-equation approach

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Anomalous magnetoresistance in [ Sr2Bi2-xPbxO4] RS[ CoO2] y (x = 0, 0.3, and 0.4; y ≈ 1.85) single crystals

Cited by 21 publications

References 30 publications

Raman-scattering study of misfit-layered (Bi, Pb)-Sr-Co-O single crystal

Raman-scattering study of misfit-layered (Bi, Pb)-Sr-Co-O single crystal

Transport properties and magnetic-field-induced localization in the misfit cobaltite [Bi2Ba1.3K0.6Co0.1O4]RS[CoO2]1.97single crystal

Noise spectra of ac-driven quantum dots: Floquet master-equation approach

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Product

Resources

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Transport properties and magnetic-field-induced localization in the misfit cobaltite [Bi₂Ba_1.3K_0.6Co_0.1O₄]^RS[CoO₂]_1.97single crystal