Magnetic and electrical transport properties of YbFe2O4
Magnetic and electrical transport properties of YbFe2O4
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DOI：
10.1103/physrevb.100.045102
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发表时间：
2019-03
影响因子：
3.7
通讯作者：
Ram Rai;J. Hinz;M. Pascolini;James Pawlak;M. Demarco
中科院分区：
文献类型：
--
作者：
Ram Rai;J. Hinz;M. Pascolini;James Pawlak;M. Demarco
我们展示了多晶 ${\mathrm{YbFe}}_{2}{\mathrm{O}}_{4}$ 的磁和电传输特性，例如电阻率、磁阻、介电常数和极化。亚铁磁转变温度在 243 K 处测量，随后分别在 $\ensuremath{\sim}190$ 和 $\ensuremath{\sim}65$ K 处测量两个低温转变。包括 $M\ensuremath{-}H$ 磁滞回线在内的磁性表现出很强的温度依赖性，并且可能表明 ${\mathrm{YbFe}}_{2}{\mathrm{O}}_{4}$ 在 65 K 以下处于自旋玻璃态。 295 K 下的铁 M\"ossbauer 测量证实了两个 Fe 位点的存在。测得的电阻率可以使用 Mott 的可变范围跳跃模型 $\ensuremath{\rho}\ensuremath{\propto}exp{({T}_{0}/T)}^{1/4}$ 进行建模，表示 ${\mathrm{Fe}}^{2+}$ 和 ${\mathrm{Fe}}^{2+}$ 之间的电子跳跃在 8 T 时观察到 ${\mathrm{Fe}}^{3+}$ 位点的磁阻效应高达 6%，该效应可能是由电子跳跃过程中场引起的变化引起的，并且发现与频率相关的复介电常数受到接触效应的强烈影响，并且多晶 ${\mathrm{YbFe}}_{2}{\mathrm{O}}_{4}$ 的极化不表现出铁电性。
We present magnetic and electrical transport properties such as resistivity, magnetoresistance, dielectric, and polarization of polycrystalline ${\mathrm{YbFe}}_{2}{\mathrm{O}}_{4}$. The ferrimagnetic transition temperature is measured at 243 K, followed by the two low-temperature transitions at $\ensuremath{\sim}190$ and $\ensuremath{\sim}65$ K, respectively. The magnetic properties including the $M\ensuremath{-}H$ hysteresis loops exhibit a strong temperature dependence and possibly indicate a spin-glass state below 65 K for ${\mathrm{YbFe}}_{2}{\mathrm{O}}_{4}$. The iron M\"ossbauer measurement at 295 K confirms the presence of two Fe sites. The measured resistivity can be modeled with the Mott's variable-range hopping model, $\ensuremath{\rho}\ensuremath{\propto}exp{({T}_{0}/T)}^{1/4}$, indicating the electron hopping between ${\mathrm{Fe}}^{2+}$ and ${\mathrm{Fe}}^{3+}$ sites. The magnetoresistance effects up to 6% at 8 T were observed and the effects could be caused by the field-induced changes in the electron-hopping processes. The frequency-dependent complex dielectric constant has been found to be strongly influenced by the contact effects, and the polarization of polycrystalline ${\mathrm{YbFe}}_{2}{\mathrm{O}}_{4}$ does not show ferroelectricity.