Dimensional crossover and anomalous magnetoresistivity in single crystals $N{a}_{x}Co{O}_2$

Abstract

The in-plane (${\rho }_{ab}$) and c-axis (${\rho }_c$) resistivities, and the magnetoresistivity of single crystals $N{a}_{x}Co{O}_2$ with x = 0.7, 0.5 and 0.3 were studied systematically. ${\rho }_{ab}(T)$ shows similar temperature dependence between $N{a}_{0.3}Co{O}_2$ and $N{a}_{0.7}Co{O}_2$, while ${\rho }_c(T)$ is quite different. A dimensional crossover from two to three occurs with decreasing Na concentration from 0.7 to 0.3. The angular dependence of in-plane magnetoresistivity for 0.5 sample shows a \emph{"d-wave-like"} symmetry at 2K, while the \emph{"p-wave-like"} symmetry at 20 K. These results give an evidence for existence of a \emph{spin ordering orientation} below 20 K turned by external field, like the stripes in cuprates.

arXiv comment4 pages, 3 figures

References in corpus (13)

• Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4
• Charge-ordering, commensurability and metallicity in the phase diagram of layered Na(x)CoO(2)
• Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy
• Coherence-Incoherence and Dimensional Crossover in Layered Strongly Correlated Metals
• Low temperature phase transitions and crystal structure of Na0.5CoO2
• Unconventional Superconductivity and Electron Correlations in Cobalt Oxyhydrate Na${}_{0.35}$CoO${}_2$$\cdot y$H${}_2$O
• Giant electron-electron scattering in the Fermi-liquid state of Na_0.7CoO_2
• Thermodynamic and Transport Measurements on Superconducting Na_xCoO_2 + yH_2O Single Crystals Prepared by Electrochemical De-intercalation
• Observation of Bulk Superconductivity in NaxCoO2.yH2O and NaxCoO2.yD2O Powder and Single Crystals
• Magnetoresistance Anomalies in Antiferromagnetic YBa_2Cu_3O_{6+x}: Fingerprints of Charged Stripes
• Crossover from coherent to incoherent electronic excitations in the normal state of Bi2Sr2CaCu2O8
• Chemical, Structural, and Transport Properties of Na1-xCoO2
• Electron scattering near an itinerant to localized electronic transition

Cited by in corpus (7)

• Magnetic Field Induced Coherence-Incoherence Crossover in the Interlayer Conductivity of a Layered Organic Metal
• In-plane ferromagnetism in charge-ordering $N{a}_{0.55}Co{O}_2$
• Monotonic growth of interlayer magnetoresistance in strong magnetic field in very anisotropic layered metals
• Anisotropic Magnetoresistance in Charge-Ordering $N{a}_{0.34}(H_{3}O{)}_{0.15}Co{O}_2$:Strong Spin-Charge Coupling and Spin Ordering
• Superconductivity, charge ordering and structural properties of alpha and beta-NaxCoO2.y(H2O, D2O)
• Magnetic field induced spin-flop transition in Na${}_x$CoO${}_2$ (0.5$<$x$<$0.55)
• Angular-dependent Magnetoresistance Oscillations in Na${}_{0.48}$CoO${}_2$ Single Crystal