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  • 1
    Electronic Resource
    Electronic Resource
    Muon spin relaxation study of the (FμF)− ion in magnetic fluorides : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5666-5668 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A positive muon implanted in a solid fluoride insulator can form a hydrogen-bonded (FμF)− ion, in which the nuclear magnetic interactions cause a distinctive zero-field (ZF) muon spin relaxation (μSR) signal. In a fluoride material in which the anions have electronic magnetic moments, the muon's interaction with nearby 19F nuclear moments must compete with its interaction with more distant but much larger anion moments. We report observation of this competition in ZF-μSR in MnF3 (TN=43 K) and CuF2 (TN=69 K). In both MnF3 and CuF2 characteristic ZF FμF oscillations are observed above the Néel temperature. As temperature drops below TN in MnF3 the relaxation rate of the (FμF)− signal increases dramatically. Below TN in CuF2 a small-amplitude high-frequency coherent oscillation appears on top of the low-frequency (FμF)− signal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353584
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of critical neutron scattering in Cr+0.2 at. % V and chromium (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5262-5264 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamic magnetic susceptibilities, χ(Q,ω), of Cr+0.2 at. % V and chromium were measured in the temperature range (TN−15 K)〈(TN+20 K) by neutron scattering. Here, χ (Q,ω) of Cr+0.2 at. % V is clearly incommensurate, in contrast to the apparently commensurate inelastic scattering seen in pure chromium. The observed form of the scattering for each material does not qualitatively change in going from above TN (paramagnetic) to below it (antiferromagnetic). Since no discontinuity in elastic magnetic intensity was observed in the alloy crystal, analysis in terms of the critical phenomena of a second-order phase transition can now be attempted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344631
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of the helimagnetic phases of holmium in a c-axis magnetic field : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5691-5693 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron diffraction measurements have been made in the (h0l) plane of holmium in a c-axis magnetic field of 3 T. Thermal expansivity measurements have also been made by capacitance dilatometry. The main focus of our investigation has been a region about 2 K wide near 96 K, where the helimagnetic structure locks into a commensurate state. We have also been able to observe the "2-τ'' satellites (at twice the fundamental magnetic ordering q vector) at temperatures as high as 3 K below the Néel transition. In the region between the lock-in transition and the Néel point, the intensities of these satellites show interesting behavior with temperature and may be showing effects due to the anomalies which have been identified in our magnetization measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347913
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  • 4
    Electronic Resource
    Electronic Resource
    Observation of a commensurate temperature plateau induced by c-axis applied magnetic fields in holmium (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5274-5276 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the magnetic structure of holmium in c-axis applied magnetic fields were made by neutron diffraction in the (h0l) plane. In applied fields of 1.7 and 2.2 T directed along the c-axis, the overall periodicity of the spiral structure locks into the commensurate superlattice value 4c0 over a finite range of temperature (approximately 2 K at 2.2 T) near 98 K, whereas no such effect is seen in the crystal in zero field. The commensurate plateau extends between two transitions bracketing 98 K reported in magnetization and dilatometry by Steinitz et al. [Phys. Rev. B 40, 763 (1989)]. No new satellites were found in this temperature range, but the intensities of the fundamental magnetic Bragg peaks exhibited precursor behavior as the commensurate state was approached in temperature both from above and below.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344635
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  • 5
    Electronic Resource
    Electronic Resource
    Critical magnetic neutron scattering above TN in Cr+0.18 at. % Re (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6321-6321 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic critical neutron scattering from a single crystal of Cr+0.18 at. % Re was observed above its Néel transition (323 K) to an incommensurate spin density wave state. The data were analyzed in terms of the critical susceptibility model that successfully fit analogous data from single crystals of pure chromium and Cr+0.2 at. % V. An additional complication in this case is the fact that a small portion of the sample becomes commensurate antiferromagnetic at a temperature well above 323 K, which causes a commensurate magnetic Bragg peak that partially obscures the critical scattering near 323 K. The "Sato-Maki'' form of incommensurate critical susceptibility fits the data reasonably well. The intensity of magnetic critical scattering in Cr+0.18 at. % Re is about a factor 2 stronger than in pure Cr, whereas in Cr+0.2 at. % V it is about the same factor weaker.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355386
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  • 6
    Electronic Resource
    Electronic Resource
    Neutron diffraction study of the Néel transition in Cr(0.5% V) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5883-5885 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: While pure chromium undergoes a first-order antiferromagnetic transition, thermal expansion measurements have indicated that the addition of small amounts of vanadium and molybdenum make the Néel transition continuous. A neutron diffraction study of a single crystal of Cr(0.5% V) showed no discontinuity in magnetic Bragg satellite intensity at the Néel temperature, TN=254 K, that would indicate a first-order transition. Complicated behavior of the satellite intensities near the transition temperature is attributed to inhomogeneous strain in the sample. The satellite intensity showed a linear temperature dependence over a range of at least 100 K below TN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342189
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  • 7
    Electronic Resource
    Electronic Resource
    Muon spin relaxation in ErRh4B4 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3197-3199 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Data on zero-field μSR in ErRh4B4 are presented for temperatures from 4 to 300 K. Due to the large erbium moment, most of the muons have a relaxation time of less than 10 ns for temperatures below about 50 K. The data have been analyzed in terms of two distinct muon sites in the material. The deduced erbium relative fluctuation rate versus temperature is related to the crystalline electric field levels of erbium in the RERh4B4 structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335148
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of zero-point motion on μ+–19F dipole coupling in the FμF− ion in fluoride insulators (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3704-3705 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A simple harmonic-potential argument is used to provide a first estimate of the ground state muon zero-point motion in the FμF− ion on the basis of the FHF− and FDF− ions in solids. A cutoff-dependent estimate of the ground state μ+–19F dipole coupling indicates that the motion causes a small increase in coupling over the fixed point-dipole value. The smallest observed F–F separation through μ+, deduced from muon spin relaxation (μSR) in CaF2, is then slightly larger than expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452972
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  • 9
    Electronic Resource
    Electronic Resource
    Muon diffusion and level crossing in copper (1991)
    Springer
    Hyperfine interactions 64 (1991), S. 721-727 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the quantum diffusion of positive muons in pure copper over the temperature range 12 mK≤T≤150 K using weak longitudinal field μSR. Below 150 K, this technique has proved to be the most sensitive to the muon hop rate. Our final results for the behaviour of the muon hop rate are well explained within the framework of theories for the quantum diffusion of light interstitials in metals of Kondo, Yamada and others. In addition, the use of level-crossing resonance has allowed us to measure the electric quadrupole interaction strength (and sign) of the copper nuclei, ωQ= −3.314(7) μS−1. These results have enabled us to show that the muon occupies the same octahedral site at all the temperatures studied, ruling out the possibility of metastable muon sites contributing to any significant portion of the muon polarization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396209
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  • 10
    Electronic Resource
    Electronic Resource
    Spin dynamics in crystalline and amorphous DyAg (1986)
    Springer
    Hyperfine interactions 31 (1986), S. 303-308 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Crystalline (cr-) Dyag [CsC] structure] orders antiferro-magnetically with TN≅60K; amorphous (am-) DyAg ferro-magnetically with TC≈-18K. We measured the longitudinal field (LF) μ+SR relaxation functions GZZ(t) for 5K〈T〈300K using surface muons. In the paramagnetic state. cr-DyAg gives an exponential GZZ (t) in the relaxation rate rising first slowly then more rapidlynear TN; no decoupling is observed in LF up to 0.4T. In the ordered state we see a Lorentzian Kubo-Toyabe GZZ(t), becoming nearly static at the lowest temperatures. Its static width is very narrow (Δ≈-7 MHz), and full dceoupling is achieved here in 0.1 T. On approaching TN, the fluctuation rate and the static width increase mootonically bt the field distribution remains Loratzian. A LF of 0.4T is then insufficient to quench the fast exponential relaxation. In paramagnetic am-DyAg, the μ+ depolarization is always much faster then in cr-DyAg. At lower temperatures it is better described by a root-exponential than an exponential GZZ(t). Below TC an exponentially relaxing signal with 1/3 amplitude is seen. The decoupling effect of LF up to 0.4T was negligible at all temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401572
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