99Ru Mössbauer effect measurements in superconducting and magnetic RuSr2GdCu2O8

Michael De Marco; Dermot Coffey; J. Tallon; Michael Haka; Steve Toorongian; Joel Fridmann

doi:10.1103/PhysRevB.65.212506

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99Ru Mössbauer effect measurements in superconducting and magnetic RuSr2GdCu2O8

Michael De Marco, Dermot Coffey, J. Tallon, Michael Haka, Steve Toorongian, Joel Fridmann

DOI 10.1103/PhysRevB.65.212506 · Physical Review B

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Abstract

99Ru Mössbauer effect measurements have been carried out at a temperature of 4.2 K on a sample RuSr2GdCu2O8 with a Néel temperature of TN=132K and superconducting transition temperature Tc=45K. The hyperfine magnetic field was determined to be 59.1(1.0) T at 4.2 K and the isomer shift was measured to be +0.05(0.02) mm/s, determining a valence state for the single Ru site to be close to +5. The Mossbauer measurements also show an electric quadrupole interaction eQVzz of 0.37(.04) mm/s. These results differ from the NMR results in RuSr2GdCu2O8 and RuSr2YCu2O8, where two different hyperfine magnetic fields (∼60 T, ∼29 T) and charge states (+5, +4) were found for Ru.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	unknown
RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	46	Pressure not reported	unknown
RuSr2YCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown