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  • 1
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    Uniaxial stress induced symmetry breaking for muon sites in Fe (1984)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Uniaxial stress was used on Fe single crystals to induce muon precession frequency shifts. The frequency shift for a nominally pure Fe sample at 302K was -0.34 + or - .023 MHz per 100 microstrain along the 100 magnetization axis. This corresponds to a change of magnetic field at the muon of 25.1 + to 1.6G/100 magnetic moment. For an Fe (3wt%Si) single crystal the shifts were -0.348 + or - .008 MHz/100 magnetic moment. The agreement between the shifts for Fe and Fe(3wt%Si) shows the effect to be intrinsic to iron and not strongly impurity sensitive. These shifts and their temperature dependence (1/T) are dominated by the effect of strain inducted population shifts between crystallographically equivalent, but mgnetically inequivalent sites. Their magnitudes are in good agreement ith previous theoretical predictions and by previous extrapolation from calculations on Nb and V especially if both 4T(0) and 1T sites contribute comparably.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ. Activities of the Solid State Physics Research Inst.; 33 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Muon motion in titanium hydride (1988)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Motional narrowing of the transverse-field muon spin rotation signal was observed in gamma-TiH(x) for x = 1.83, 1.97, and 1.99. An analysis of the data for TiH1.99 near room temperature indicates that the mechanism responsible for the motion of the muon out of the octahedral site is thermally activated diffusion with an attempt frequency comparable to the optical vibrations of the lattice. Monte Carlo calculations to simulate the effect of muon and proton motion upon the muon field-correlation time were used to interpret the motional narrowing in TiH1.97 near 500 K. The interpretation is dependent upon whether the Bloembergen, Purcell, and Pound (BPP) theory or an independent spin-pair relaxation model is used to obtain the vacancy jump rate from proton NMR T1 measurements. Use of BPP theory shows that the field-correction time can be obtained if the rate of motion of the muon with respect to the rate of the motion for the protons is decreased. An independent spin-pair relaxation model indicates that the field-correlation time can be obtained if the rate of motion for the nearest-neighbor protons is decreased.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ., Materials Science with Muon Spin Rotation; 22 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Static magnetic ordering of CeCu2.1Si2 found by muon spin relaxation (1988)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Zero- and longitudinal-field muon spin relaxation measurements on a polycrystal sample of a heavy fermion superconductor CeCu2.1 Si2 (T(c) = 0.7 K) have revealed an onset of static magnetic ordering below T approximately 0.8 K. The line shapes of the observed spectra in zero field indicate a wide distribution of static random local fields at muon sites, suggesting that the ordering is either spin glass or incommensurate spin-density-wave state. The observed width of the random local field at T = 0.05 K corresponds to a small averaged static moment of the order of 0.1 micro-B per formula unit.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ., Materials Science with Muon Spin Rotation; 7 p
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    NASA TECHNICAL REPORTS
  • 4
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    Coexisting static magnetic ordering and superconductivity in CeCu2.1Si2 found by muon spin relaxation (1988)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Zero- and longitudinal-field muon spin relaxation measurements on a heavy fermion system CeCu2.1 Si2 have revealed an onset of static magnetic ordering below T(M) approximately 0.8 K, which coexists with superconductivity below T(c) = 0.7 K. The line shapes of the observed muon spin depolarization functions suggest an ordering in either spin glass or incommensurate spin-density-wave state, with a small averaged static moment of the order of 0.1 micro-B per formula unit at T approaches 0.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ., Materials Science with Muon Spin Rotation; 14 p
    Format: text
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    NASA TECHNICAL REPORTS
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