Coexistence of superconductivity and magnetic order in YBa2Cu4O8 |
| |
Authors: | I Felner I Nowik E R Bauminger U Yaron D Hechel |
| |
Institution: | (1) Racah Institute of Physics, The Hebrew University, 91904 Jerusalem, Israel |
| |
Abstract: | 57Fe Mössbauer spectroscopy, magnetic susceptibility and powder x-ray-diffraction measurements were used to study superconductivity and magnetic order in YBa2(Cu1?xFex)4O8+δ. Tc is decreasing with x, disappearing for x>xc≈0.04. For xc iron substitutes Cu, predominantly in the Cu(1) site exhibiting a single quadrupole Mössbauer spectrum at 90 K. For x>xc magnetic order is observed in the Cu(2) site, TN=380 (5) K for x=0.1 and Heff (Cu(2), 4.2 K)=510(2) kOe. However, the most surprising discovery is that for x=0.025, for which Tc=27(2) K, the Fe in the Cu(1) site orders magnetically at TN=30(2) K and Heff (Cu(1), 4.2 K)=461(2) kOe. The coexistence and competition between superconductivity and magnetic order in the Cu(1) and Cu(2) sites in YBa2Cu4O8 are discussed in terms of the previously observed phase diagrams for Y1?xPrxBa2(Cu1?yFey)3Oz. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|