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arXiv 1201.4091cond-mat.mtrl-sci
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磁场对PtSn4输运性质的影响

Magnetic Field Effects on Transport Properties of PtSn4

Eundeok Mun, Hyunjin Ko, Gordon J. Miller, German D. Samolyuk, Sergey L. Bud'ko, Paul. C. Canfield

备注：
accepted to PRB
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摘要：

本文报道了在磁场高达140 kOe，平行和垂直于晶体学b轴的条件下，正交晶系PtSn_4单晶的各向异性物理性质。磁化率具有近似的温度无关的行为，并揭示了ac平面和b轴之间的各向异性。在磁场低至5 kOe和温度高达30 K时，在磁化等温线中检测到清晰的de Haas-van Alphen振荡。PtSn 4的热电势和电阻率表现出强烈的温度和磁场依赖性。在H = 140 kOe时，观察到热电势的变化高达~ 50 μ V/K。PtSn 4单晶在1.8 K和140 kOe下表现出非常大的横向磁电阻，ac平面约为5x10^5%，b轴电阻率约为1.4x10^5%，以及明显的Shubnikov-de Haas振荡。在所测的温度和磁场范围内，PtSn_4的磁电阻符合科勒定律。霍尔电阻率在高温下表现出线性温度依赖性，随后在25 K附近出现符号反转，这与热电功率测量结果一致。量子振荡和能带结构计算表明PtSn 4具有三维费米面。

英文摘要：

The anisotropic physical properties of single crystals of orthorhombic PtSn4 are reported for magnetic fields up to 140 kOe, applied parallel and perpendicular to the crystallographic b-axis. The magnetic susceptibility has an approximately temperature independent behavior and reveals an anisotropy between ac-plane and b-axis. Clear de Haas-van Alphen oscillations in fields as low as 5 kOe and at temperatures as high as 30 K were detected in magnetization isotherms. The thermoelectric power and resistivity of PtSn4 show the strong temperature and magnetic field dependencies. A change of the thermoelectric power at H = 140 kOe is observed as high as ~ 50 mu-V/K. Single crystals of PtSn4 exhibit very large transverse magnetoresistance of ~ 5x10^5% for the ac-plane and of ~ 1.4x10^5% for the b-axis resistivity at 1.8 K and 140 kOe, as well as pronounced Shubnikov-de Haas oscillations. The magnetoresistance of PtSn4 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 25 K which is consistent with thermoelectric power measurements. The observed quantum oscillations and band structure calculations indicate that PtSn4 has three dimensional Fermi surfaces.

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