Abstract
The anisotropic physical properties of single crystals of orthorhombic PtSn 4 are reported for magnetic fields up to 140kOe, applied parallel and perpendicular to the crystallographic b axis. The magnetic susceptibility has an approximately temperature-independent behavior and reveals an anisotropy between the ac plane and b axis. Clear de Haas-van Alphen oscillations in fields as low as 5kOe and at temperatures as high as 30K were detected in magnetization isotherms. The thermoelectric power and resistivity of PtSn 4 show the strong temperature and magnetic field dependencies. A change of the thermoelectric power at H=140kOe is observed as high as 50μV/K. Single crystals of PtSn 4 exhibit very large transverse magnetoresistance of 5×105% for the ac plane and of 1.4×105% for the b axis resistivity at 1.8K and 140kOe, as well as pronounced Shubnikov de Haas oscillations. The magnetoresistance of PtSn 4 appears to obey Kohler's rule in the temperature and field range measured. The Hall resistivity shows a linear temperature dependence at high temperatures followed by a sign reversal around 25K which is consistent with thermoelectric power measurements. The observed quantum oscillations and band structure calculations indicate that PtSn 4 has three-dimensional Fermi surfaces.
Original language | English |
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Article number | 035135 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 85 |
Issue number | 3 |
DOIs | |
State | Published - Jan 31 2012 |