Electron paramagnetic resonance and electron‐nuclear double resonance study of Mn2+ ions in CdGeAs2 crystals
Abstract
Electron paramagnetic resonance (EPR) and electron‐nuclear double resonance (ENDOR) have been used to characterize Mn2+ (3d5) ions in CdGeAs2 crystals grown by the horizontal Bridgman method. These samples were p‐type with room‐temperature hole concentrations ranging from 2 × 1015 cm–3 to 5 × 1016 cm–3. The Mn2+ ions substitute for the Cd2+ ions in this tetragonal chalcopyrite lattice, and form “deep” isoelectronic centers. Their g values and crystal‐field parameters are g ‖ = 2.0025, g ⊥ = 2.0011, D = 118.8 MHz, a + 2/3F = 18.4 MHz, and a = –0.3 MHz. The hyperfine and nuclear electric quadrupole parameters for the 55Mn nucleus are A ‖ = –154.94 MHz, A ⊥ = –155.69 MHz, and P = 0.622 MHz. Hyperfine parameters for one set of nearby Cd nuclei and two sets of nearby As nuclei were also determined using ENDOR. No evidence was found in these doped bulk crystals to suggest that Mn4+ ions substitute for Ge4+ ions. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 21, 2006
- Source ID
- 10.1002/pssb.200541162
Entities
People
- Kevin T. Zawilski
- L E Halliburton
- N. C. Giles
- N. Y. Garces
- R. C. Demattei
- Robert S. Feigelson
- S. M. Evans
Organizations
- Air Force Office of Scientific Research