Low-energy μSR at PSI: present and future

Morenzoni, E.; Glückler, H.; Prokscha, T.; Weber, H.P.; Forgan, E. M.; Jackson, Trevor; Luetkens, H.; Niedermayer, Ch.; Pleines, M; Birke, M.; Höfer, A.; Litterst, F. J.; Riseman, T. M.; Schätz, G.

doi:10.1016/s0921-4526(00)00303-3

Cited by 80 publications

(54 citation statements)

References 3 publications

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“…1. The implantation energy is usually varied by applying a positive or negative bias of up to 12 kV to the electrically insulated sample holder 39 . Shallow Mu formation deep in the bulk at z ∼ 200 − 300 µm was studied at the GPS spectrometer at the πM3 beam line with a muon beam energy of about 3.5 MeV.…”

Section: Methodsmentioning

confidence: 99%

Depth dependence of the ionization energy of shallow hydrogen states in ZnO and CdS

et al. 2014

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The characteristics of shallow hydrogen-like muonium (Mu) states in nominally undoped ZnO and CdS (0001) crystals have been studied close to the surface at depths in the range of 10 nm -180 nm by using low-energy muons, and in the bulk using conventional µSR. The muon implantation depths are adjusted by tuning the energy of the low-energy muons between 2.5 keV and 30 keV. We find that the bulk ionization energy Ei of the shallow donor-like Mu state is lowered by about 10 meV at a depth of 100 nm, and continuously decreasing on approaching the surface. At a depth of about 10 nm Ei is further reduced by 25 -30 meV compared to its bulk value. We attribute this change to the presence of electric fields due to band bending close to the surface, and we determine the depth profile of the electric field within a simple one-dimensional model.

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Section: Methodsmentioning

confidence: 99%

Depth dependence of the ionization energy of shallow hydrogen states in ZnO and CdS

et al. 2014

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“…Therefore, the traditional experimental techniques for studying magnetism such as neutron scattering, NMR and bulk mSR are not applicable. Recently, the technique of lowenergy muon spin rotation (LE-mSR) has been developed 20 . In LE-mSR, the mean implantation depth of the muons can be controlled from a few nm to a few hundred nm (see Methods).…”

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confidence: 99%

The phase diagram of electron-doped La2−xCexCuO4−δ

et al. 2015

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Superconductivity is a striking example of a quantum phenomenon in which electrons move coherently over macroscopic distances without scattering. The high-temperature superconducting oxides (cuprates) are the most studied class of superconductors, composed of two-dimensional CuO 2 planes separated by other layers that control the electron concentration in the planes. A key unresolved issue in cuprates is the relationship between superconductivity and magnetism. Here we report a sharp phase boundary of static threedimensional magnetic order in the electron-doped superconductor La 2 À x Ce x CuO 4 À d , where small changes in doping or depth from the surface switch the material from superconducting to magnetic. Using low-energy spin-polarized muons, we find that static magnetism disappears close to where superconductivity begins and well below the doping level at which dramatic changes in the transport properties are reported. These results indicate a higher degree of symmetry between the electron and hole-doped cuprates than previously thought.

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“…Muons are implanted in the sample with an energy which can be controlled by a voltage applied to the sample holder. Further details on the spectrometer and technique are given elsewhere [24].…”

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confidence: 99%

Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co0.074Fe0.926)
Ofer
¹
,
Baglo
²
,
Hossain
³

et al. 2012
Phys. Rev. B
23
1
24
0
View full text Add to dashboard Cite

Low-energy μSR at PSI: present and future

Cited by 80 publications

References 3 publications

Depth dependence of the ionization energy of shallow hydrogen states in ZnO and CdS

Depth dependence of the ionization energy of shallow hydrogen states in ZnO and CdS

The phase diagram of electron-doped La2−xCexCuO4−δ

Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co0.074Fe0.926)
Ofer
¹
,
Baglo
²
,
Hossain
³

et al. 2012
Phys. Rev. B
23
1
24
0
View full text Add to dashboard Cite

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Low-energy μSR at PSI: present and future

Cited by 80 publications

References 3 publications

Depth dependence of the ionization energy of shallow hydrogen states in ZnO and CdS

Depth dependence of the ionization energy of shallow hydrogen states in ZnO and CdS

The phase diagram of electron-doped La2−xCexCuO4−δ

Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co0.074Fe0.926)Ofer1, Baglo2, Hossain3 et al. 2012Phys. Rev. B231240View full textAdd to dashboardCite

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Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co0.074Fe0.926)
Ofer
¹
,
Baglo
²
,
Hossain
³

et al. 2012
Phys. Rev. B
23
1
24
0
View full text Add to dashboard Cite