Study of the valence transition in YbInCu4 by inelastic neutron scattering

✍ Scribed by A. Severing; E. Gratz; B.D. Rainford; K. Yoshimura

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 245 KB
• Volume: 163
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(90)90226-k

✦ Synopsis

In YbInCu, a valence transition occurs from an almost stable trivalent phase for T > 4.5 K to an intermediate-valence state below 45 K. We have investigated the imaginary part of the dynamic susceptibility ,$' of YbInCu, above and below the transition and compared it with spectra of the stable valent compound YbInNi,. YbInNi, and YbInCu, in the trivalent phase exhibit crystal-field (CF) excitations, centered at about 4meV. Below the valence transition in YbInCu, the CF excitations disappear and instead we observe a broad magnetic signal centered at about 40 meV, i.e., energy transfers ten times larger than the position of the CF lines of the stable valent phase.