Crystal field splitting in NdAl₃ studied by inelastic neutron scattering

Abstract

Inelastic neutron scattering experiments are performed in polycrystalline NdAI, t o determine the crystalline electric field parameters for the NdS+ ion in its hexagonal environment. The parameters obtained are checked with the results of other measurements related to the crystalline electric field, such as magnetic susceptibility, heat capacity, and electric resistivity.An polykristallinem NdAI, werden inelastisclie Neutronenstreuexperimente durchgefuhrt, um die elektrischen Kristallfeldparameter fur Nd8+-Ionen in ihrer hexagonalen Umgebung zu bestimmen.Die erhsltenen Parameter werden mit Ergebnissen anderer Messungen, die mit dem elektrischen Kristallfeld verknupft sind, wie magnetische Suszeptibilitiit, Wiirmekapazitat und elektrischer Widerstand, iiberpruft.

Crystal-field excitations in PrAl3and NdAl3at ambient and elevated pressure

“…Moreover, the hexagonal structure allows a change of the lattice parameter ratio c/a under hydrostatic pressure p. We have performed INS experiments for PrAl 3 ( p = 0) and NdAl 3 ( p = 0 and 0.84 GPa) which allowed for an unambiguous determination of the CF parameters. Our data clarify earlier INS studies of the CF in these compounds which resulted either in different possible sets of CF parameters for PrAl 3 [1][2][3][4] or uncertainties about the CF ground state in NdAl 3 [5]. The CF parameters obtained in the present work are examined with regard to extrapolation schemes based on the extended point-charge model (PCM) and first principles density functional theory (DFT).…”

Crystal field in the heavy fermion compound CeAl3

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“…¶²μÏ´Ò¥ ²¨´¨¨Å · ¸Î¥É¸ÊÎ¥Éμ³ ³μ²¥±Ê²Ö·´μ£μ ¶μ²Ö¨É´Ê Õ ¢μ¸ ¶·¨¨³Î¨¢μ¸ÉÓ ³μ¦´μ ¶·¥¤¸É ¢¨ÉÓ ¢ ¢¨¤¥ ¢²¥´´μ° [13], μ¤´ ±μ ¶ · ³¥É·Ò Š μ ¶·¥¤¥²¥´Ò¸¡μ²ÓÏ¥°´ ¤¥¦´μ¸ÉÓṎ Éμδμ¸ÉÓÕ. Éμ £² ¢´Ò³ μ¡· §μ³¸¢Ö § ´μ¸É·¥³Ö μ¡¸ÉμÖÉ¥²Ó¸É¢ ³¨:¸ ¶¥±-É·Ò,¨ §³¥·¥´´Ò¥´ ¸ ¶¥±É·μ³¥É·¥ …',´¥¸μ¤¥·¦ ²¨Ëμ´μ´´μ£μ ¢±² ¤ ; · §·¥Ï¥´¨¥ ¡Ò²μ §´ Ψɥ²Ó´μ ²ÊÎÏ¥, Î¥³ ¢ ¶·¥¤Ò¤ÊÐ¨Ì Ô±¸ ¶¥·¨³¥´É Ì [13] μ¤´μ¢·¥³¥´´μ ´ ²¨ §¨·μ¢ ²¨¸Ó É·¨É¥³ ¶¥· ÉÊ·Ò, ÎÉμ ¶μ §¢μ²¨²μ ¢±²ÕΨÉÓ ¢ ´ ²¨ § Ô´¥·£¨¨¨¨´É¥´¸¨¢´μ¸É¨¡μ²ÓÏ¥¥ Ψ¸²μ ¶¥·¥Ìμ¤μ¢¸¢μ §¡Ê¦¤¥´-ÒÌ Ê·μ¢´¥°. μ¸²¥¤´¥¥¥ μ¡¸ÉμÖÉ¥²Ó¸É¢μ¸ÊÐ¥¸É¢¥´´μ, É ± ± ± μ¸μ¡¥´´μ¸ÉÓÕ Ì¥³Ò Ê·μ¢´¥°Š ¢ PrAl 3 Ö¢²Ö¥É¸Ö μ¸´μ¢´μ°Ê·μ¢¥´Ó Ÿ¨´£²¥É ƒ 1 ,¸±μ-Éμ·μ£μ ¢μ §³μ¦¥´Éμ²Ó±μ 줨´ ¶¥·¥Ìμ¤´ ¶¥·¢Ò°¢μ §¡Ê¦¤¥´´Ò°Ê·μ¢¥´Ó Å ¤Ê¡²¥É ƒ 6¸Ô´¥ ·£¨¥°4,52 ³Ô‚.…”

Neutron Polarisation Analysis, Spin Glasses and Other Systems

“…An energy of 4·5 meV agrees closely with that from other experiments (Alekseev et al . 1982(Alekseev et al . , 1983Andreef et al .…”

“…1978), and the lower energy peak has also been seen before (Andreef et al . 1978;Alekseev et al . 1983).…”