Magnetism in superconducting EuFe2As1.4P0.6 single crystals studied by local probes

作者：Munevar, J.^*; Micklitz, H.; Alzamora, M.; Argueello, C.; Goko, T.; Ning, F. L.; Munsie, T.; Williams, T. J.; Aczel, A. A.; Luke, G. M.; Chen, G. F.; Yu, W.; Uemura, Y. J.; Baggio-Saitovitch, E.

来源：Solid State Communications, 2014, 187: 18-22.

DOI：10.1016/j.ssc.2014.02.001

• Iron pnictides
• Mossbatter spectroscopy
• mu SR
• Superconductivity

We have studied the magnetism in superconducting single crystals of EuFe2As1.4P0.6 by using the local probe techniques of zero-field muon spin rotation/relaxation and Eu-151/Fe-57 Mossbauer spectroscopy. All of these measurements reveal magnetic hyperfine fields below the magnetic ordering temperature T-M = 18 K of the Eu2+ moments. The analysis of the data shows that there is a coexistence of antiferromagnetism, resulting from Eu2+ moments ordered along the crystallographic c-axis, and superconductivity below T-SC approximate to 10 K. We find indications for a change in the dynamics of the small Fe magnetic moments (similar to 0.07 mu(B)) at T* similar or equal to 15 K that may be triggering the onset of superconductivity: below T* the Fe magnetic moments seem to be "frozen" within the ab-plane.

• 出版日期2014-6
• 单位浙江大学; 中国人民大学