Hyperfine interactions on 111Cd-probe nuclei in chromium
Abstract
The hyperfine interactions on 111Cd probe nuclei in a chromium matrix are studied in the temperature range 4.2 to 340 K using time differential perturbed (γ-γ) angular correlation of 173-247-keV cascade of 111Cd. The cadmium nuclei are found to experience hyperfine fields given by an Overhauser distribution function confirming the existence of the spin-density waves in chromium. The temperature variation of the hyperfine fields clearly displays the first-order Néel transition at TN=311 K and the spin-flip transition at Tsf=123 K. The data also confirm that the Néel transition is a first-order transition. The hyperfine fields measured above and below the spin-flip transition temperature are found to be different, showing that the hyperfine fields are strongly dependent on spin polarization resulting in different net polarized spin density at the probe nucleus above and below Tsf. In contrast to tantalum impurities, a cadmium probe is found to follow the temperature dependence of the chromium host magnetization faithfully. The data show small but finite texture effects. The observed texture effects probably arise either due to spontaneous partial crystallization of the sample or due to stress-cooling effects on the magnetic structure of chromium. The dilute impurity hyperfine field on 111Cd at 4.2 K in chromium is measured to be 60.3 (+/- 2.0) kOe. Systematics of the known dilute-impurity hyperfine-field values in chromium matrix are discussed.
- Publication:
-
Physical Review B
- Pub Date:
- May 1980
- DOI:
- 10.1103/PhysRevB.21.3851
- Bibcode:
- 1980PhRvB..21.3851V