ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    He〈sup LOCATION="PRE"〉3 immersion cell for ultralow temperature study of amorphous solids (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 1831-1834 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have constructed a 3He immersion cell for dielectric measurements of insulating amorphous solids in a nuclear demagnetization cryostat at temperatures between 500 μK and 150 mK. The samples are directly immersed in 3He with two heat exchangers per electrode which are thermally isolated from each other and have a very low capacitance to ground. The cell incorporates a 195Pt pulsed NMR thermometer with a novel superconducting magnet and a3He viscometer for calibration. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148055
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Study of the orientational electric field effect in 3He-B (1979)
    Springer
    Journal of low temperature physics 34 (1979), S. 607-616 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We have studied the orienting effect that an electric field has on the orbital motion of the pairs in superfluid 3He-B, using the orientation-dependent transverse NMR frequency shift as a probe. This method provides high resolution for studying the orienting effect for either sign of the orientational energy. Electric fields as high as 35,000 V/cm applied across the sample produced no measurable frequency shift at 0-, 10-, and 32-bar pressures. This gives upper limits to the orientational energy of 1.4 × 10\s-3, 1.0 × 10\s-3 and 4 × 10\s-4 times the values expected from simple theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114945
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Thermal boundary conductance between the U2D2 solid and B superfluid phases of3He (1993)
    Springer
    Journal of low temperature physics 90 (1993), S. 475-490 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the first measurement of the thermal boundary conductance, 1/R B , between the U2D2 spin ordered solid and theB superfluid phases of3He. We find that 1/R B is exceedingly high, roughly seven orders of magnitude greater than that between sintered silver powder and liquid3He. ForT〈0.56 mK, 1/R B appeared to be thermally activated, i.e. 1/R B ∼exp(−ε/k B T), with ε=4.5(±0.5) mK, close to the superfluid gap energy. We also present a theory involving magnon-quasiparticle coupling as a model to explain the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681893
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Spin-wave phenomena in liquid3He systems (1972)
    Springer
    Journal of low temperature physics 8 (1972), S. 229-254 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic effects predicted by Leggett and Rice for Fermi liquids in the collisionless regime have been verified. Spin-echo measurements are reported which demonstrate the existence of spin waves and undamped spin currents in liquid3He and dilute3He-4He solutions. The experimental results are compared with the theoretical expressions of Leggett and Rice, and values of the Fermi liquid interaction parameter $$\lambda = \left[ {1/(1 + F_0^a )} \right] - \left\{ {1/[1 + (F_1^a /3)]} \right\}$$ are derived for three samples: liquid3He atP=0 and 27 atm, and a 6.4%3He-4He solution. In addition, some techniques for direct observation of individual spin-wave modes are explored and the results reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655081
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Nuclear magnetic order in solid 3He (1992)
    Springer
    Journal of low temperature physics 87 (1992), S. 297-342 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Over the past 20 years our understanding of cooperative magnetic phenomena in solid 3He has expanded greatly. Starting from the concept of atomic exchange, the author explains how early experiments led to the abandonment of the naive Heisenberg nearest neighbor antiferromagnetic Hamiltonian, in favor of a multiple exchange model. He then describes the detailed experimental picture of the spin-ordered phases which has developed over the past decade, and the successes and failures of the multiple exchange model to explain the experimental results. Today solid 3He is a powerful model magnetic system for extending our general understanding of magnetic order, and should continue to play an important role for many years to come.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114908
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Low temperature magnetization of3He films (1994)
    Springer
    Journal of low temperature physics 94 (1994), S. 489-513 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have made NMR studies of thin films of pure3He adsorbed on Graf oil. Such films were cooled to ∼ 75 μK, an order of magnitude colder than previous workers could attain. In particular, we measured the magnetization of the solid second atomic layer, (M2), which displays antiferromagnetic (AFM) behavior at low densities and ferromagnetic (FM) behavior at high densities. At both AFM and FM densities, we could measure M2 at temperatures well below the exchange energy (J). Our data at the AFM densities may support a proposed model of that phase. At the FM densities, we have found that M2 (T = 0) is linear in second layer density (p2) and rises by a factor of ∼7 with a 6% increase in ϱ2 and less than a factor of 2 increase in the apparent value of J, suggesting that the FM phase coexists with a lower density AFM phase. Our high temperature (T 〉J) data also support such a two phase model. We find that M2 follows the expected behavior for a 2 dimensional Heisenberg ferromagnet down to T ≪ J, the first experimental observation of such behavior. We also confirmed the importance of k = 0 spin waves in determining the low temperature behavior of such a system. The NMR lineshape in the FM phase also displayed shifts and broadening due to demagnetization effects which support the model of two phase coexistence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753824
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Nonequilibrium and hysteretic low temperature dielectric response to strain in glasses (1997)
    Springer
    Journal of low temperature physics 106 (1997), S. 717-725 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present data on the nonequilibrium ac dielectric response of amorphous insulators to the application of a quasi-dc mechanical strain field below 150 mK. The behavior of the system after perturbation by a strain field is analogous to that observed after the application of a dc electrical field. In the current theoretical framework the nonequilibrium response is due to a time dependent density of states correction resulting from TLS-TLS interactions. In addition, an anomalous hysteresis in fast strain and electric field sweeps is reported which may represent the predicted dynamical response of relaxing independent TLS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395933
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Textural singularities in superfluid3He-B (1977)
    Springer
    Journal of low temperature physics 29 (1977), S. 29-41 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absorption signal occasionally found missing in the middle of resonance absorption lines in NMR is explained on the basis of a textural singularity of the anisotropy axis in the B phase of 3 He. The singularity combines with the field gradient present to give rise to an asymmetric hole in the signal with a singularity on the high-frequency side. The line shapes and temperature dependence are predicted and agree well with experiment. Spin waves are found to be trapped by the potential well formed by the texture and the field gradient. The frequency intervals predicted for the spin waves also agree well with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659087
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Thermal Conductivity in Glasses Below 1K: New Technique and Results (2000)
    Springer
    Journal of low temperature physics 120 (2000), S. 259-268 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the capacitance of a glass sample as its own thermometer, we have measured the thermal conductivity of two glasses below 700mK. This technique avoids any thermal boundary resistance between the thermometer and the sample. In addition, since the loss tangent goes to zero as the temperature is lowered, the amount of heat dissipated in a capacitive measurement is very small at low temperatures. We were able to measure the thermal conductivity at temperatures which were previously experimentally inaccessible and found that the thermal conductivity, κ, scales as T 1.86 down to 10mK, in agreement with the two-level system model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004689828780
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    facet.materialart.
    Unknown
    Unusual Magnetic Relaxation in SuperfluidHe3 (1975)
    American Physical Society
    Details
    Publication Date: 1975-03-10
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...