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Two-pulsed (π/2 – τ–π – τ echo) echo field swept (EDEPR) spectra for all the samples measured at 4 K using a time delay τ = 136 ns. The magnetic field is swept from 100 mT to 900 mT. The dashed line represents the magnetic field at which the 2D-HYSCORE experiments have been carried out.
(a) 2D-HYSCORE spectrum of the sample F (Al < P). (b) 2D-HYSCORE spectrum of the sample A (Al > P).
HYSCORE diagonal projection of the six samples measured at 4 K and static magnetic field 350 mT. The bands at 3.0 MHz, 3.9 MHz, and 6.0 MHz corresponds respectively to the Larmor frequencies of 29Si, 27Al, and 31P.
Rough cooperative luminescence spectra of the six samples. Inset: cooperative luminescence intensity normalized with absorption and lifetime data.
Molar contents of Al, P, and Yb in the different fiber preforms.
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