107 research outputs found
Pressure Effect on the Antiferromagnetic Compound Ce2Ni3Ge5
In this study, the electrical resistivity and magnetization of a single crystal of Ce2Ni3Ge5 heavy fermion compound were performed under pressure. The resistivity and magnetization showed two antiferromagnetic transitions at ambient pressure. On applying pressure, the transitions merged at 1 GPa. At higher pressures, the antiferromagnetic transition temperature decreases, and disappears. It is suggesting that the critical pressure of Ce2Ni3Ge5 was 4.1 GPa
Investigation of the Superconducting Gap Structure in SrFe(AsP) by Magnetic Penetration Depth and Flux Flow Resistivity Analysis
We measured the microwave surface impedances and obtained the superfluid
density and flux flow resistivity in single crystals of a phosphor-doped
iron-based superconductor SrFe(AsP) single crystals
(, ). At low temperatures, the superfluid density,
, obeys a power law, , with a
fractional exponent of -1.6. The flux flow resistivity was significantly
enhanced at low magnetic fields. These features are consistent with the
presences of both a gap with line nodes and nodeless gaps with a deep minimum.
The remarkable difference observed in the superconducting gap structure between
SrFe(AsP) and BaFe(AsP) in our
experiments is important for clarifying the mechanism of iron-based
superconductivity
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