Coexistence of magnetism and superconductivity inR1.4Ce0.6

IrSr2Sm1.15Ce0.85CuColman1, Mclaughlin2 2012Phys. Rev. B

“…The ruthenocuprates have received much attention for the observation of simultaneous weak ferromagnetism and superconductivity, two properties thought incompatible. 8 When underdoped, the ruthenocuprates have also been shown to display a sizeable low-temperature magnetoresistance. [9][10][11][12] Surprisingly, this magnetoresistance is found to be tunable from negative to positive values as r A , the mean A site (R 1.1 Ce 0.9 ) cation radius, decreases in a series of RuSr 2 R 1.1 Ce 0.9 Cu 2 O 10−δ (R = Nd, Sm, Eu, and Gd with Y) samples.…”

A possible crypto-superconducting structure in a superconducting ferromagnet

“…They are RuSr 2 GdCu 2 O 8 (Ru-1212) [6] and RuSr 2 (R 0.7 Ce 0.3 ) 2 Cu 2 O 10 (Ru-1222) [7], in which R = Gd or Eu, with (T m , T s ) of (133 K, 14-47 K) for Ru-1212, (180 K, 42 K) for Ru-1222 when R = Gd, and (122 K, 32 K) for Ru-1222 when R = Eu. They have therefore been called superconducting ferromagnets [8].…”

Effect of Mn substitution on the delicate balance between structure and properties of Gd1.4Ce0.6Sr2RuCu2O10

“…Ruthenocuprates hold a special position amongst the materials exhibiting such a coexistence since in these materials magnetic transition precedes the superconducting transition. For instance magnetic transition occurs at 130K (T M1) and 95K (TM2) in the layered compound Gd 1.4 Ce 0.6 Sr 2 RuCu 2 O 10 (1222) and the superconducting transition (T c ) occurs at 40 K. Observation of hysteresis in magnetization measurements at temperatures around 5 K is considered as a confirmation of the existence of ferromagnetism [1] in the superconducting state. A number of studies have been made on Ruthenocuprates to identify the origin of the two magnetic transitions and the co-existing superconducting transition.…”