Minima of the muon depolarization rate inCd1−xMn

Abstract

Muon-spin rotation experiments were carried out on Cd 1Ϫx Mn x Te samples with different Mn concentrations x and different annealing treatments ͑in Cd vapor or in vacuum͒. The purpose of the experiment was to elucidate the origin of the pronounced minima in the temperature dependence of the muon depolarization rate. We found that the data can be analyzed in a two-state model with the assumption that the muon has a high ͑10-30 s Ϫ1 ) depolarization rate in state one and a low ͑0.1-0.3 s Ϫ1 ) depolarization rate in state two. The minima are attributed to a change from state one ͑presumably a paramagnetic center͒ to state two ͑presumably a diamagnetic center͒. The state change is either purely electronic or caused by a site change of the muon.

Probing the magnetic ground state of theDX−center inCd1−xMnxGiblin1, Terry2, Read3 et al. 2006Phys. Rev. B2010View full textAdd to dashboardCite

“…Muons have been found to be a useful probe of the spin glass behavior of CMT with x Ͼ 0.2. [18][19][20][21] We investigate samples below the spin glass percolation limit ͑x Ͻ 0.2͒, moreover we observe the DX center perturbing the implanted muon environment. The CMT samples were doped with either indium or aluminum atoms as the former dopant has been shown to form DX-like centers 22,23 while the latter is expected to behave only as a shallow donor level.…”