11 Result(s)
within
R. Blaauwgeers
English
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Article
Effect of the Magnetic Order on 3He Crystals
Solid 3He orders magnetically into two different phases below the Néel transition depending on the magnetic field (U2D2 or low field phase below 450 mT and CNAF or high field phase above 450 mT). We have perform...
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Article
Quartz Tuning Fork: Thermometer, Pressure- and Viscometer for Helium Liquids
Commercial quartz oscillators of the tuning-fork type with a resonant frequency of ∼ 32 kHz have been investigated in helium liquids. The oscillators are found to have at best Q values in the range 105–106, when ...
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Article
Improved Optical Setup to Measure Growth and Megting of Solid 3He Below 1 mK in Magnetic Fields Up to 9 Tesla
Recent experiments on crystal growth and crystal shape in 3He at zero magnetic field at 0.55 mK by Tsepelin et al. 1, 2 in Helsinki have revealed many new facets and strong anisotropy in the growth rates. Since 3
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Article
Time-of-Flight Measurements on Quantized Vortex Lines in Rotating 3He-B
Vortex loops are injected into a long cylindrical sample of rotating vortex-free superfluid 3He-B. Using non-invasive NMR techniques, we measure the time required for them to expand along the sample axis to form ...
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Article
Superfluid He in Rotation: Single-Vortex Resolution and Requirements on Rotation
The present generation of rotating refrigerators, which are used for the study of quantized vorticity in helium superfluids, are often capable of cooling to mK temperatures and rotate up to ∼ 1 rev/s. To achie...
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Article
An intrinsic velocity-independent criterion for superfluid turbulence
Hydrodynamic flow in classical and quantum fluids can be either laminar or turbulent. Vorticity in turbulent flow is often modelled with vortex filaments. While this represents an idealization in classical flu...
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Article
NMR Spectroscopy of the Double-Quantum Vortex in Superfluid 3He-A
The double-quantum vortex line with continuous (singularity-free) structure is the most common linear defect in rotating 3He-A. Its well-known experimental signature is a frequency-shifted satellite peak in the N...
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Chapter
Quantized Vorticity in Superfluid 3He-A: Structure and Dynamics
Superfluid 3He-A displays the largest variety in vortex structure among the presently known coherent quantum systems. The experimentally verified information comes mostly from NMR measurements on the rotating .ui...
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Article
NMR Line Shape of Rotating 3He-B at Large Counterflow Velocity
We have investigated the NMR line shapes of superfluid 3He-B in a rotating cylinder. In the vortex-free state at sufficiently large angular velocity of rotation, Ω≳1 rad/s, the main feature of the absorption spec...
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Article
Double-quantum vortex in superfluid 3He-A
Linear defects are generic in continuous media1. In quantum systems they appear as topological line defects which are associated with a circulating persistent current. In relativistic quantum field theories they ...
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Article
On the Possibility of Observing Third Sound on 3He
This paper focuses on the hydrodynamics of third sound on a superfluid 3 He film. We solve the hydrodynamical equations in the limit of thick films with weak inter...
