Multiple superconducting transitions in theSr3Ru2O7region ofSr3Ru2O7-Sr2RuO4eutectic crystals
Multiple superconducting transitions in theSr3Ru2O7region ofSr3Ru2O7-Sr2RuO4eutectic crystals
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Sr3Ru2O7-Sr2RuO4共晶晶体Sr3Ru2O7区域的多重超导转变
DOI：
10.1103/physrevb.77.214511
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发表时间：
2006
影响因子：
3.7
通讯作者：
A. Vecchione
中科院分区：
文献类型：
--
作者：
S. Kittaka;S. Fusanobori;S. Yonezawa;Hiroshi Yaguchi;Y. Maeno;R. Fittipaldi;R. Fittipaldi;A. Vecchione;A. Vecchione
本文报道了Sr_3Ru_2O_7-Sr_2RuO_4共晶晶体的超导性质。该共晶晶体是由自旋三重态超导体Sr_2RuO_4和变磁正常金属Sr_3Ru_2O_7组成。虽然Sr_3Ru_2O_7还没有被报道表现出超导性，到目前为止，我们的交流磁化率测量显示多个超导转变发生在共晶晶体的Sr_3Ru_2O_7区域。在平行于c轴的低AC场下，抗磁屏蔽基本上达到全分数。然而，屏蔽分数和起始温度都很容易被抑制大于0.1 mT-rms的AC字段，并没有观察到异常的比热。此外，这些转变的临界场曲线在零场附近具有正曲率，这与体Sr 2 RuO 4的上临界场曲线不同。这些事实表明，在Sr 3Ru 2 O 7区域中观察到的超导性不是体性质。为了解释这些实验结果，我们提出的方案，堆叠RuO 2平面，超导Sr 2 RuO 4的积木，包含在Sr 3Ru 2 O 7区域的堆垛层错。
We report superconducting properties of Sr3Ru2O7-Sr2RuO4 eutectic crystals, consisting of the spin-triplet superconductor Sr2RuO4 with a monolayer stacking of RuO2 planes and the metamagnetic normal metal Sr3Ru2O7 with a bilayer stacking. Although Sr3Ru2O7 has not been reported to exhibit superconductivity so far, our AC susceptibility measurements revealed multiple superconducting transitions occurring in the Sr3Ru2O7 region of the eutectic crystals. The diamagnetic shielding essentially reached the full fraction at low AC fields parallel to the c axis. However, both the shielding fraction and the onset temperature are easily suppressed by AC fields of larger than 0.1 mT-rms and no anomaly was observed in the specific heat. Moreover, the critical field curves of these transitions have a positive curvature near zero fields, which is different from the upper critical field curve of the bulk Sr2RuO4. These facts suggest that the superconductivity observed in the Sr3Ru2O7 region is not a bulk property. To explain these experimental results, we propose the scenario that stacking RuO2 planes, the building block of superconducting Sr2RuO4, are contained in the Sr3Ru2O7 region as stacking faults.
超导Sr_2RuO_4与Ru微夹杂物界面处的隧道特性
DOI：
--
发表时间：
2005
期刊：
Journal of the Physical Society of Japan 74
影响因子：
--
作者：
矢口 宏;前野悦輝;川村 稔;K.Kitagawa et al.;R.Fittipaldi et al.;M.Kawamura et al.;Kent S.Wood et al.;Y.Ihara et al.;Per G.Bjornsson et al.;M.Kato et al.;H.Tou et al.;M.Kawaniura et al.
通讯作者：
M.Kawaniura et al.
Sr_3Ru_2O_7Sr_3Ru_2O_7 变磁转变中的德哈斯-范阿尔芬效应
DOI：
--
发表时间：
2004
期刊：
Physical Review Letters 92
影响因子：
--
作者：
K.Deguchi;Z.Q.Mao;H.Yaguchi;Y.Maeno;T.Waki et al.;Yonezawa et al.;N.Kikugawa et al.;S.A.Grigera et al.;T.T.Tran et al.;N.Kikugawa et al.;R.Higashinaka et al.;O.Sakai et al.;H.Murakawa et al.;O.Friedt et al.;R.S.Perry et al.;K.S.Wood et al.;H.Yaguchi et al.;J.S.Lee et al.;N.Kikugawa et al.;N.Hiraoka et al.;J.Hooper et al.;J.Hooper et al.;Y.M.Jana et al.;K.Deguchi et al.;R.A.Borzi et al.
通讯作者：
R.A.Borzi et al.