8 research outputs found
Nonlinear paramagnetic magnetization in the mixed state of CeCoIn_5
Torque and magnetization measurements in magnetic fields up to 14 T were
performed on CeCoIn single crystals. The amplitude of the paramagnetic
torque shows an dependence in the mixed state and an
dependence in the normal state. In addition, the mixed-state magnetizations for
both and axes show anomalous behavior after the
subtraction of the corresponding paramagnetic contributions as linear
extrapolations of the normal-state magnetization. These experimental results
point towards a nonlinear paramagnetic magnetization in the mixed state of
CeCoIn, which is a result of the fact that both orbital and Pauli limiting
effects dominate in the mixed state.Comment: 2 pages, 2 figures, conferenc
Magnetotransport Properties of Antiferromagnetic YBa_2Cu_3O_6.25 Single Crystals
In-plane and out-of-plane magnetoresistivities (MR) of antiferromagnetic
YBa_2Cu_3O_6.25 single crystals were measured in magnetic fields H applied
along the (ab) plane. In-plane MR is a superposition of two components: The
first component is strongly in-plane anisotropic, changing sign from negative
when H is parallel to the electrical current I to positive when H is
perpendicular to I. The second component is positive, quadratic in H, and
isotropic in the (ab)-plane. The out-of-plane MR displays a fourfold symmetry
upon in-plane rotation of the magnetic field, with maxima along the easy axes
of antiferromagnetic spin ordering and minima along unfavorable directions of
spin orientation (45 degrees from the Cu-O-Cu bonds).Comment: 8 pages, 4 figure
Universal scaling of the Hall resistivity in MgB2 superconductors
The mixed-state Hall resistivity and the longitudinal resistivity in
superconducting MgB2 thin films have been investigated as a function of the
magnetic field over a wide range of current densities from 100 to 10000 A/cm^2.
We observe a universal Hall scaling behavior with a constant exponent of 2.0,
which is independent of the magnetic field, the temperature, and the current
density. This result can be interpreted well within the context of recent
theories.Comment: 4 page
Theory for Electron-Doped Cuprate Superconductors: d-wave symmetry order parameter
Using as a model the Hubbard Hamiltonian we determine various basic
properties of electron-doped cuprate superconductors like
and for a
spin-fluctuation-induced pairing mechanism. Most importantly we find a narrow
range of superconductivity and like for hole-doped cuprates -
symmetry for the superconducting order parameter. The superconducting
transition temperatures for various electron doping concentrations
are calculated to be much smaller than for hole-doped cuprates due to the
different Fermi surface and a flat band well below the Fermi level. Lattice
disorder may sensitively distort the symmetry via
electron-phonon interaction
In-plane Hall effect in c-axis-oriented MgB2 thin films
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 (R_H) behaves as R_H ~ 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 and for magnetic fields up to 5 T.Comment: 5 pages including 5 figure