Muonium spectroscopy in ZnSe: Metastability and conversion

Vilão, R. C.; Alberto, H. V.; Duarte, J. Piroto; Gil, J. M.; Weidinger, A.; Campos, N. Ayres de; Lichti, R. L.; Chow, K. H.; Cox, S. F. J.

doi:10.1103/physrevb.72.235203

Cited by 32 publications

(20 citation statements)

References 28 publications

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“…The hyperfine interaction extrapolated to zero temperature is 3629(2) MHz, corresponding to about 81% of the vacuum value; it decreases slightly with temperature due to vibrations of the surrounding atoms. The fit curve is obtained assuming an Einstein model for the vibrations with an activation energy of 21(2) meV [32].…”

Section: A the Muonium Statementioning

confidence: 99%

“…This work has been performed often in conjunction with ab initio DFT calculations on the same systems [27][28][29][30][31]. Many similarities have been found, and the typical signature of the acceptor configuration shows up as the almost free muonium in an interstitial site [5,6,13,18,20,28,[31][32][33], whereas the donor configuration typically appears as a shallow-donor state bound to oxygen [5][6][7][8]20,23]. However, significant unexplained differences have been found in particular with respect to the formation probabilities of the different states.…”

Section: Introductionmentioning

confidence: 99%

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Barrier model in muon implantation and application to Lu2O3

et al. 2018

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In implantation experiments, the implanted particle is shot with a certain energy into the material and comes to rest at a site which may not correspond to the final position. The rearrangements of the surrounding atoms to accommodate the particle, i.e., the reaction with the host atoms may require some time and lead to delayed formation of the final states. In the case of the implantation of positive muons, this rearrangement process can be followed on a timescale of nanoseconds to microseconds. A delay is expected if an energy barrier inhibits the prompt reaction. We note that the barrier height may change during the rearrangement of the lattice, thus giving rise to a two-dimensional potential profile for the conversion process. The barrier model describes the reaction path of the muon in analogy to the passage over a mountain with a saddle point. The passing over the saddle point corresponds to the lowest energy trajectory. As an example, we discuss the application of the barrier model to solid Lu 2 O 3 .

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Section: A the Muonium Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Barrier model in muon implantation and application to Lu2O3

et al. 2018

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“…On the other hand, the atom-like negative muonium, the analog of the quasi-free H − , is very unstable if embedded in the host lattice. It is conceivable that this Mu − is formed for a short time in a fluctuating capture and loss process as reported in the experiment on highly-doped n-type samples at high temperatures [17], or possibly in n-type samples after the ionization of donors, again in a cyclic capture and loss process [18,19] though in the latter case a revision of the assignment is intended following this work. However, a Mu − with the characteristics of the fast relaxing signal, i.e.…”

Section: Mumentioning

confidence: 99%

Role of the transition state in muon implantation

et al. 2017

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In muon-spin-rotation experiments, positive muons are implanted in the material and come to rest in the unrelaxed host lattice. The formation of the final configuration requires a lattice relaxation which does not occur instantly. The present paper is concerned with the transition from the initial stopping state to the final muon configuration. We identify the often observed fast relaxing signal in muon experiments (e.g., in several oxides studied recently) with the transition state in this conversion process. This state is paramagnetic with a small hyperfine interaction (in the order of MHz) which fluctuates and averages to almost zero. Because of its apparent diamagnetic frequency behavior, the fast signal was in the past assigned to Mu + or Mu − . We present evidence that this state is actually paramagnetic. The model presented in this paper is of importance for the interpretation of past and future μSR measurements.

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“…However, the rapid reactivity of hydrogen means that many of the techniques that are used to investigate hydrogen in semiconductors are not able to probe isolated H. Studies of muonium ͑Mu 0 = + e − ͒ using the muon spin rotation/relaxation/resonance ͑SR͒ techniques are now widely recognized to be the main experimental source of information on isolated H in many semiconductors. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Recall that the muon ͑ + ͒ is a radioactive particle with a lifetime of Ϸ2.2 s. It can be considered a pseudoisotope of hydrogen with Ϸ 1 9 th the mass of the proton, but is still much heavier than the electron ͑Ϸ200ϫ ͒. Hence, the electronic structures of Mu 0 and H 0 are very similar.…”

Section: Introductionmentioning

confidence: 99%

Optically induced dynamics of muonium centers in Si studied via their precession signatures

et al. 2008

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We studied the influence of the optical excitation on three muonium centers Mu T 0 , Mu BC 0 , and Mu BC + in high resistivity silicon. These investigations were carried out on the spin precession signature of each center as a function of temperature. It is found that photoexcitation resulted in significant enhancements of the depolarization rates of the precession signals as the three muonium centers underwent interactions with photogenerated free carriers. The results are described by a three-state model involving transitions between Mu T 0 , Mu BC 0 , and Mu BC + as well as spin exchange processes.

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Muonium spectroscopy in ZnSe: Metastability and conversion

Cited by 32 publications

References 28 publications

Barrier model in muon implantation and application to Lu2O3

Barrier model in muon implantation and application to Lu2O3

Role of the transition state in muon implantation

Optically induced dynamics of muonium centers in Si studied via their precession signatures

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