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首页> 美国卫生研究院文献>Scientific Reports >Effect of pressure on normal and superconducting state properties of iron based superconductor PrFeAsO0.6Fy (y = 0.12 0.14)
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Effect of pressure on normal and superconducting state properties of iron based superconductor PrFeAsO0.6Fy (y = 0.12 0.14)

机译：压力对铁基超导体PrFeAsO0.6Fy的常态和超导状态特性的影响（y = 0.120.14）

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摘要

The effect of high pressure (up to 8 GPa) on normal and superconducting state properties of PrFeAsO0.6F0.12, an 1111-type iron based superconductor close to optimal doped region, has been investigated by measuring the temperature dependence of resistivity. Initially, the superconducting transition temperature (T c) is observed to increase slowly by about 1 K as pressure (P) increases from 0 to 1.3 GPa. With further increase in pressure above 1.3 GPa, T c decreases at the rate of ~1.5 K/GPa. The normal-state resistivity decreases monotonically up to 8 GPa. We have also measured the pressure dependence of magnetization (M) on the same piece of PrFeAsO0.6F0.12 sample up to 1.1 GPa and observed T c as well as the size of the Meissner signal to increase with pressure in this low-pressure region. In contrast, for an over-doped PrFeAsO0.6F0.14 sample, magnetization measurements up to 1.06 GPa show that both T c and the Meissner signal decrease with pressure. The present study clearly reveals two distinct regions in the dome-shaped (T c-P) phase diagram of PrFeAsO0.6F0.12.
机译：通过测量电阻率的温度依赖性，研究了高压（高达8 GPa）对1111型铁基超导体接近最佳掺杂区域的PrFeAsO0.6F0.12的常态和超导态性能的影响。最初，随着压力（P）从0增加到1.3 GPa，观察到超导转变温度（T c）缓慢增加约1K。随着压力进一步增加到1.3 GPa以上，T c以〜1.5 K / GPa的速率下降。正常状态的电阻率单调降低至8 GPa。我们还测量了同一块PrFeAsO0.6F0.12样品（高达1.1 pressureGPa）的磁化强度（M）的压力依赖性，并观察到T c以及Meissner信号的大小随该低压区域的压力而增加。相反，对于过量掺杂的PrFeAsO0.6F0.14样品，高达1.06 GPa的磁化强度测量结果表明T c和Meissner信号均随压力降低。本研究清楚地揭示了PrFeAsO0.6F0.12的圆顶形（T c-P）相图中的两个不同区域。

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