Crystal-field interaction at the thulium site in

Abstract

Mössbauer spectroscopy is used to monitor the quadrupole interaction for the superconductor as a function of temperature. Qualitative comparison with other results supports earlier claims that the rank-2 crystal-field contribution lies between that for and that for . However, there is quantitative disagreement with crystal-field parameters determined elsewhere for .

Alternative crystal-field parameters for rare-earth ions obtained from various techniques: II. Reanalysis of spectroscopic data for Eu3+ and Er3+ ions in RE2BaXO5 (X=Co, Cu, Ni, Zn) high temperature superconductors and related systems

“…Disagreement between CFPs [2] and those determined by others for HoBa 2 Cu 4 O 8 have been considered and partially clarified [1]. Similarly, our reanalysis [3] of theoretical and experimental CFP sets [4,5] has enabled clarification of unjustified claims or misinterpretations concerning the non-standard [4] and standard [5] CFP sets for Nd 3+ in Nd 2 BaCuO 5 .…”

“…The rationale behind this series of papers has been presented in details in Part I [1], which dealt with the orthorhombic 0925 crystal-(ligand) field parameters (CFPs) for Tm 3+ in TmBa 2 Cu 4 O 8 and RE 3+ ions in REBa 2 Cu 3 O 7−␦ obtained using Mössbauer spectroscopy [2]. Disagreement between CFPs [2] and those determined by others for HoBa 2 Cu 4 O 8 have been considered and partially clarified [1].…”

“…Similarly, our reanalysis [3] of theoretical and experimental CFP sets [4,5] has enabled clarification of unjustified claims or misinterpretations concerning the non-standard [4] and standard [5] CFP sets for Nd 3+ in Nd 2 BaCuO 5 . The discrepancies concerning the CFP sets [2,4,5] identified in [1,3] appear to be mainly due to lack of awareness of the intrinsic distinction between the non-standard and standard orthorhombic CFP sets (as defined in [6,7]), which is still often occurring in literature.…”

“…Recent review [8] of CF spectroscopy, pertinent techniques, and applications to high temperature superconductors as well as Refs. [1][2][3][4][5] (and references therein) may be useful in this regard. In principle, CFPs for identical or similar ionhost systems obtained by various methods should be comparable.…”

Lanthanide Doped Wide Band Gap Semiconductors: Intra-4f Luminescence and Lattice Location Studies

“…This will provide the valence of the ions, and also point to the symmetry of the crystal field. Although this method was applied successfully to a number of hosts with both Mössbauer spectroscopy [92,93] and PAC [94], up to now no such hyperfine investigations of lanthanides in semiconductors seem to exist. This fact appears to be mainly due to the insufficient availability of radioactive lanthanide ions.…”