We report an experimental study on the effect of Mn impurities in the optimally doped LaFeAsO 0.89 F 0.11 compound. The results show that a very tiny amount of Mn, of the order of 0.1%, is enough to destroy superconductivity and to recover at low temperatures both the magnetic ground state and the orthorhombic structure of the pristine LaFeAsO parent compound. The results are discussed within a model where electron correlations enhance the Ruderman-Kittel-Kasuya-Yosida interaction among impurities.
Sanna S., Carretta P., Moroni M., Prando G., Bonfa P., Allodi G., et al. (2019). Fast recovery of the pristine magnetic and structural phases in superconducting LaFeAsO 0.89 F 0.11 by Mn/Fe substitution. JOURNAL OF PHYSICS. CONDENSED MATTER, 31(17), 1-7 [10.1088/1361-648X/ab0234].
Fast recovery of the pristine magnetic and structural phases in superconducting LaFeAsO 0.89 F 0.11 by Mn/Fe substitution
Sanna S.
;
2019
Abstract
We report an experimental study on the effect of Mn impurities in the optimally doped LaFeAsO 0.89 F 0.11 compound. The results show that a very tiny amount of Mn, of the order of 0.1%, is enough to destroy superconductivity and to recover at low temperatures both the magnetic ground state and the orthorhombic structure of the pristine LaFeAsO parent compound. The results are discussed within a model where electron correlations enhance the Ruderman-Kittel-Kasuya-Yosida interaction among impurities.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
