99Ru Mössbauer effect measurements in superconducting and magnetic RuSr2GdCu2O8
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=132 K and superconducting transition temperature Tc=45 K. 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.
- Publication:
-
Physical Review B
- Pub Date:
- June 2002
- DOI:
- 10.1103/PhysRevB.65.212506
- Bibcode:
- 2002PhRvB..65u2506D
- Keywords:
-
- 76.80.+y;
- 71.20.Be;
- 71.20.Nr;
- 75.50.Ee;
- Mossbauer effect;
- other gamma-ray spectroscopy;
- Transition metals and alloys;
- Semiconductor compounds;
- Antiferromagnetics