Аннотация:
Recently the evidence of the helical magnetic structure modulated along the c axis with the period of four lattice parameters was obtained in easy ab plane ferromagnetic superconductor EuRbFe4As4 [K. Iida, Phys. Rev. B 100, 014506 (2019)2469-995010.1103/PhysRevB.100.014506]. We argue that such structure may appear due to the presence of superconductivity. In spite of the very small value of the exchange field acting on the superconducting electrons in EuRbFe4As4, the exchange mechanism of interaction between superconductivity and ferromagnetism could dominate over the electromagnetic one and this circumstance could favor the emergence of the short-period magnetic structure (with the period less than the superconducting coherence length). Such a situation differs from one in the similar compound P-doped EuFe2As2, where the electromagnetic mechanism dominates and results in the magnetic structure with significantly larger period (of the order of London penetration depth). We also analyze
Ключевые слова:
Arsenic compounds; Europium compounds; Ferromagnetic materials; Ferromagnetism; Iron compounds; Magnetic structure; Rubidium compounds; Electromagnetic mechanism; Exchange fields; Exchange mechanism; External magnetic field; Ferromagnetic superconductors; London penetration depth; Onset temperature; Superconducting coherence length; Iron-based Superconductors
Devizorova Z.
Buzdin A. Aleksandr 1954-
Девизорова З.
Буздин А. Александр 1954-
Superconductivity-driven helical magnetic structure in EuRbFe4As4 ferromagnetic superconductor
Текст визуальный непосредственный
Physical Review B
Vol.100, Issue10 Num.104523
2019
Статья
Arsenic compounds Europium compounds Ferromagnetic materials Ferromagnetism Iron compounds Magnetic structure Rubidium compounds Electromagnetic mechanism Exchange fields Exchange mechanism External magnetic field Ferromagnetic superconductors London penetration depth Onset temperature Superconducting coherence length Iron-based Superconductors
Recently the evidence of the helical magnetic structure modulated along the c axis with the period of four lattice parameters was obtained in easy ab plane ferromagnetic superconductor EuRbFe4As4 [K. Iida, Phys. Rev. B 100, 014506 (2019)2469-995010.1103/PhysRevB.100.014506]. We argue that such structure may appear due to the presence of superconductivity. In spite of the very small value of the exchange field acting on the superconducting electrons in EuRbFe4As4, the exchange mechanism of interaction between superconductivity and ferromagnetism could dominate over the electromagnetic one and this circumstance could favor the emergence of the short-period magnetic structure (with the period less than the superconducting coherence length). Such a situation differs from one in the similar compound P-doped EuFe2As2, where the electromagnetic mechanism dominates and results in the magnetic structure with significantly larger period (of the order of London penetration depth). We also analyze