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arXiv 1104.0137cond-mat.supr-concond-mat.str-el
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P掺杂对PrOFe0 .9Co0.1As超导和临界性质的影响

Superconducting and critical properties of PrOFe0.9Co0.1As: effect of P doping

Shilpam Sharma, Jai Prakash, Gohil S. Thakur, A. T. Satya, A. Bharathi, A K Ganguli, C S Sundar

摘要:

PrOFe_(0.9)Co_(0.1)As是一种超导体,其超导温度约为14 K。在试图诱导电荷转移,也诱导化学压力之间的FeAs和PrO层,我们已经合成了第一次oxypnictides的类型PrOFe0.9Co0.1As1-xPx(P掺杂在As网站)。所有化合物均为四方ZrCuSiAs型结构(空间群= P4/nmm)。在PrOFe_(0.9)Co_(0.1)As中,当P离子以0.13K/at的低速率取代As时,晶格常数a和c减小,而TC减小。对于x > 0.1,P的%。的不可逆场(Hirr)和临界电流密度(JC),使用交流磁化率测量得到的被发现单调减少与增加的“P”浓度。“Hirr”被观察到比HC 2小得多,指向非常低的钉扎能量。使用现场输运和交流磁化率测量获得的钉扎势显示约40 meV的低值,并且随着P取代没有显着变化。

英文摘要:

PrOFe0.9Co0.1As is known to be a superconductor with a TC of ~14 K. In an attempt to induce charge transfer and also induce chemical pressure between the FeAs and PrO layers we have synthesized for the first time oxypnictides of the type PrOFe0.9Co0.1As1-xPx (P doping at As sites). All the compounds crystallize in the tetragonal ZrCuSiAs type structure (space group = P4/nmm). The lattice parameters (a and c) decrease as expected on substitution of smaller phosphorous at the arsenic site in PrOFe0.9Co0.1As and a decrease in TC was observed on substitution of P ions at a low rate of 0.13K/at. % of P for x > 0.1. The irreversibility field (Hirr) and critical current density (JC), obtained using the AC susceptibility measurements was found to decrease monotonically with increasing 'P' concentration. 'Hirr' is observed to be much smaller than HC2, pointing to a very low pinning energy. The pinning potential obtained using both in-field transport and AC susceptibility measurements indicate a low value of ~40 meV and show no significant variation with P substitution.

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