Hyperfine interactions inN61iwith synchrotron-radiation-based perturbed angular correlations

Abstract

We report on the observation of perturbed angular ␥-␥ correlations with 67.41 keV nuclear resonance of 61 Ni using nuclear resonance scattering of synchrotron radiation. The dependence of the correlations on the direction and the magnitude of the hyperfine magnetic field is demonstrated in the feasibility study with nickel metal. The interpretation of the experimental data is done using modification of the theory of conventional perturbed angular correlations for the case of the linearly polarized first photon.

Hyperfine Splitting and Room-Temperature Ferromagnetism of Ni at Multimegabar Pressure

“…Figure 3 shows the measured pressure dependence of the magnetic hyperfine field at room temperature. The magnitude of the field at ambient pressure is 6.90(3) T, which is consistent with previous measurements [28,29]. Upon compression, the magnetic hyperfine field increases, an effect previously observed in nuclear magnetic resonance studies up to 3 GPa [30].…”

Synchrotron Radiation‐Based Nuclear Resonant Scattering: Applications To Bioinorganic Chemistry

“…It makes SRPAC an ideal technique to study 61 Ni. The first 61 Ni SRPAC experiment was done by Sergueev et al on 61 Ni-enriched Ni foil to reveal the magnetic hyperfine interactions [18]. Here we report the first application of 61 Ni SRPAC to a 61 Ni-enriched Ni ferrite to reveal the magnetic hyperfine interactions.…”

“…Next, we will consider the SRPAC intensity in the presence of magnetic hyperfine interactions. In the case of randomly oriented nuclear magnetic moments, R(t) takes the form [18] where v B ¼ Àg e N m N B= h is the Larmor frequency, proportional to the g-factor of the nuclear excited state g e N and to the magnetic field B, m N is the nuclear magneton. In the case of the magnetic moments aligning along the magnetic field B, it can be shown that the anisotropy factor R(t) has the form [18]…”

“…Since SRPAC signal is independent of the Lamb-M€ ossbauer factor, f LM , it has been demonstrated to study electric quadrupole interactions and relaxation in soft condensed matter [12] containing M€ ossbauer isotope 57 Fe and 119 Sn [17]. It has also been demonstrated to study magnetic dipole interactions of a 61 Ni-enriched Ni foil [18].…”

Revealing the hidden hyperfine interactions in ε -iron

“…The relatively unconventional technique of SRPAC has great potential and was indeed used to study the properties of Mössbauer active nuclei, e.g., iron-57 [24], tin-119 [25], nickel-61 [26]. SRPAC may be also used with less-known Mössbauer active nuclei [27] both in the solid or liquid phase.…”