β-detected nuclear quadrupole resonance with a low-energy beam ofLi+8

Abstract

A nuclear quadrupole resonance (NQR) spectrum of 8 Li has been observed in a single crystal of SrTiO 3 using a beam of low-energy highly polarized radioactive 8 Li + . The resonances were detected by monitoring the ␤-decay anisotropy as a function of a small audio frequency magnetic field. These results demonstrate that low energy nuclear spin polarized 8 Li can be used as a sensitive probe of the local magnetic and electronic environment in nanostructures and ultrathin films in zero static applied magnetic field.

Vortex lattice disorder inYBa2Cu3O7−δprobed usingSaadaoui1, MacFarlane2, Salman3 et al. 2009Phys. Rev. BSelf Cite11130View full textAdd to dashboardCite

“…Therefore, the implanted 8 Li + can monitor the depth dependence of the local magnetic field distribution in materials at nm scale by measuring the NMR lineshape in a manner analogous to conventional NMR. 2,28,29 In this work, the 8 Li + ions are decelerated to stop in the Ag overlayer deposited on each of the three YBCO samples. Implantation profiles of 8 Li + were calculated using the TRIM.SP code, 45 examples of which are shown in Fig.…”

Muon spin relaxation study of the magnetism in unilluminated Prussian Blue analogue photomagnets

“…It has been shown that with the formation of the metastable magnetic centers, the material becomes less absorbing in the wavelength region relevant to the photomagnetism [32], thus it is possible that the photomagnetic state would eventually grow out from the illuminated surfaces, but such an effect was apparently not sufficient to influence the magnetism on the ∼ 100 µm surface muon stopping range. A more favorable situation to study these effects is in a thin film geometry [33] using low energy muons [34] or β-NMR probes [35,36,37].…”

Beta-detected NQR in zero field with a low energy beam of 8

“…We have established earlier that the 8 Li occupies the face centered cite in SrTiO 3 [2,11], and therefore experiences a nonvanishing EFG. Indeed a large and sharp NQR resonance was observed at 3ν q = 228.81(2) kHz with width 1.7 kHz corresponding to the | ± 2 ↔ | ± 1 transitions (see Fig.…”

“…Recently, we have constructed two spectrometers for beta-detected nuclear magnetic resonance [1] (β-NMR) and nuclear quadrupole resonance [2] (β-NQR), using a low energy highly polarized 8 Li + beam. We report here on the first results obtained from the β-NQR spectrometer at zero applied magnetic field.…”

“…A more detailed description of the β-NQR spectrometer and of the beta detected nuclear resonance technique used can be found in Ref. [2] and references therein. Once the development of this spectrometer is completed it will have the capability to reduce the beam energy to 100 eV, allowing for depth profiling measurements on a nm scale in zero applied magnetic field.…”