Magnetic susceptibilities and crystalline electric field effects in single crystals of NdBa2Cu3O7−δ

Alternative crystal field parameters for rare-earth ions obtained from various techniques: IV. Comparative analysis of crystal field parameters obtained from inelastic neutron scattering and related studies of RE ions (RE=Er3+, Ho3+, Nd3+, Pr3+) in REBa2Cu3O7−δ high-Tc superconductors

“…Since the earlier CFPs [37] failed to fit the data on directional susceptibilities, although matched well with both the measured mean susceptibility and INS spectra, Senthilkumaran et al [39] varied the CFP [37] one at a time to study their effect on directional susceptibilities and the energy levels simultaneously. A best set of CFP obtained in that way [39] fitted both the directional susceptibilities and INS energy levels satisfactorily (Table 1c).…”

“…No source reference was provided for the definition of V q k by Ravindran et al [37], Uma et al [38] (this paper deals with Pr 3+ ions and other aspects are discussed in Section 3.4), and Senthilkumaran et al [39]. The operators V q k resemble the Wybourne operators, however, judging by the description in text in [37][38][39], the symbols V q k represent another specific tensor notation.…”

“…The operators V q k resemble the Wybourne operators, however, judging by the description in text in [37][38][39], the symbols V q k represent another specific tensor notation. The conversion relations between the actual Wybourne's CFPs B kq in Eq.…”

“…The conversion relations between the actual Wybourne's CFPs B kq in Eq. (2) and the CFPs B q k [37][38][39] may be only indirectly deduced from the CFP values of other authors [28] and [29] cited in [37] and [39], respectively. We obtain: B kq ¼ p k B q k ; p 2 % À0:73; p 4 % 0:89; p 6 % À0:78.…”

“…We obtain: B kq ¼ p k B q k ; p 2 % À0:73; p 4 % 0:89; p 6 % À0:78. The original CFPs B q k [37][38][39] converted in this way are also listed in Table 1. Using the standard set of [28] as starting CFPs for fittings of magnetic susceptibility data for Nd 3+ ions NdBa 2 Cu 3Àz Zn z O 7Àd , it was found [37] that although these CFP could reproduce the INS data [28] well, there were appreciable discrepancies between the calculated and experimental magnetic susceptibility data.…”