Pressure effect on superconductivity in Cd2Re2O7
Pressure effect on superconductivity in Cd2Re2O7
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DOI：
10.1088/1742-6596/200/1/012043
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
K. Fujiwara;K. Morimoto;E. Maeda;S. Nishigori
中科院分区：
文献类型：
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作者：
K. Fujiwara;K. Morimoto;E. Maeda;S. Nishigori
用188/187 Re核四极共振（NQR）和交流磁化率测量研究了高压下Cd 2 Re 2 O 7的超导性与结构转变（室温下Ts 1 = 200 K和Ts 2 = 120 K）的关系. Tc在1GPa以下几乎与压力无关，而在1GPa以上，Tc单调增加，并在2.5GPa时达到2.3K。188/187 Re-NQR谱在±3/2 Participate ±5/2跃迁中随压力的增加而展宽并向低频移动。此外，Re的NQR谱在2GPa附近突然展宽，表明Re位的电场梯度分布较广，这可能与Ts 2被抑制到~ 0 K时的无序状态有关。
188/187Re nuclear quadrupole resonance (NQR) and ac susceptibility measurements in Cd2Re2O7 have been performed to study correlation between superconductivity and structural transition (Ts1 = 200 K and Ts2 = 120 K at ambient pressure) under high pressure, using a hybrid piston cylinder-type high-pressure cell. Tc is almost pressure independent below 1 GPa, while, above 1 GPa, Tc increases monotonously and reaches up to 2.3 K at 2.5 GPa. The 188/187Re-NQR spectrum for ±3/2 ↔ ±5/2 transition broadens and shifts to lower frequency with applying pressure. Furthermore, Re NQR spectrum broadens suddenly around 2GPa, suggesting that electric field gradient at Re sites distributes extendedly, which may be related to the disorder state with suppressing Ts2 down to ~ 0 K.