scholarly journals Design of a system for controlling a levitating sphere in superfluid 3He at extremely low temperatures

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Manuel Arrayás ◽  
José L. Trueba ◽  
Carlos Uriarte ◽  
Dmitry E. Zmeev
Keyword(s):  
Low Temperatures ◽  
Theoretical Study ◽  
Superfluid 3He ◽  
Edge States ◽  
Promising Direction ◽  
Topological Superfluid ◽  
Device Stability ◽  
Superconducting Sphere ◽  
Experimental Challenge ◽  
Mechanical Probe

AbstractWe present a new mechanical probe to study the properties of superfluid 3He at microkelvin temperatures down to 100 μK. The setup consists of a set of coils for levitating a superconducting sphere and controlling its motion in a wide variety of regimes. In particular, the realisation of motion of a levitating body at a uniform velocity presents both an experimental challenge and a promising direction into the study of the edge states in topological superfluid 3He-B. We include the theoretical study of the device stability and simulations to illustrate the capabilities of the control system.

scholarly journals Design of a system for controlling a levitating sphere in superfluid 3He at extremely low temperatures

2021 ◽  
Author(s):  
Manuel Arrayás ◽  
José L. Trueba ◽  
Carlos Uriarte ◽  
Dmitry E. Zmeev
Keyword(s):  
Low Temperatures ◽  
Theoretical Study ◽  
Superfluid 3He ◽  
Edge States ◽  
Promising Direction ◽  
Topological Superfluid ◽  
Device Stability ◽  
Superconducting Sphere ◽  
Experimental Challenge ◽  
Mechanical Probe

Abstract We present a new mechanical probe to study the properties of superfluid 3 He at microkelvin temperatures down to 100µK. The setup consists of a set of coils for levitating a superconducting sphere and controlling its motion in a wide variety of regimes. In particular, the realisation of motion of a levitating body at a uniform velocity presents both an experimental challenge and a promising direction into the study of the edge states in topological superfluid 3 He-B. We include the theoretical study of the device stability and simulations to illustrate the capabilities of the control system.

SPIN DIFFUSION COEFFICIENT OF A1-PHASE OF SUPERFLUID 3He AT LOW TEMPERATURES

2009 ◽  
Vol 23 (12) ◽  
pp. 1603-1610 ◽  
Author(s):  
R. AFZALI ◽  
F. PASHAEE
Keyword(s):  
Diffusion Coefficient ◽  
Boltzmann Equation ◽  
Low Temperatures ◽  
Spin Diffusion ◽  
Superfluid 3He ◽  
Total Spin ◽  
Equation Approach ◽  
Fluid Component ◽  
Melting Pressure ◽  
Superfluid Component

The spin diffusion coefficient tensor of the A1-phase of superfluid 3 He at low temperatures and melting pressure is calculated using the Boltzmann equation approach and Pfitzner procedure. Then considering Bogoliubov-normal interaction, we show that the total spin diffusion is proportional to 1/T2, the spin diffusion coefficient of superfluid component [Formula: see text] is proportional to T-2, and the spin diffusion coefficient of super-fluid component [Formula: see text] is independent of temperature. Furthermore, it is seen that superfluid components play an important role in spin diffusion of the A1-phase.

Second viscosity of A1-phase of superfluid 3He at low temperatures

2010 ◽  
Vol 405 (4) ◽  
pp. 1050-1054 ◽  
Author(s):  
R. Afzali ◽  
F. Rahmati
Keyword(s):  
Low Temperatures ◽  
Superfluid 3He

scholarly journals A theoretical study of a possible model of paramagnetic alums at low temperatures

1940 ◽  
Vol 176 (965) ◽  
pp. 203-213 ◽  
Keyword(s):  
Magnetic Field ◽  
Low Temperatures ◽  
Theoretical Study ◽  
Spontaneous Magnetization ◽  
Critical Value ◽  
Transition Curve ◽  
Thin Specimen ◽  
First Order ◽  
Freely Suspended ◽  
Line Of Critical Points

An attempt is made to examine theoretically the properties of paramagnetic alums at low temperatures. The model taken is a lattice of freely suspended magnets, all interactions except purely magnetic being neglected. Even with this simplification it is impossible at present to make rigorous calculations of the partition function, either on classical or quantum lines. A simple model is proposed, which is really a generalization of the Bragg - Williams theory enabling one to take account of the effect of a magnetic field. The few configurations whose energies are known are used to fix arbitrary constants in the expression assumed for the energy. The theory predicts that the state of lowest energy is either a spontaneously magnetized, state for a long thin specimen, or a state in which alternate rows of magnets point in opposite directions for a sphere, spontaneous magnetization appearing in an ellipsoid with an eccentricity greater than a certain critical value. The transition curve bounding the region in which the antiparallel state is stable consists partly of a line of Curie points corresponding to transitions of the second, order, passing smoothly into a line of critical points corresponding to a transition of the first order. The effect of shape on the magnetic properties of the specimen seems to be experimentally verified, but the rough nature of the theory prevents it being more than qualitative.

The Dynamic Texture of Superfluid 3He-B at Very Low Temperatures and in High Magnetic Fields

2005 ◽  
Vol 138 (3-4) ◽  
pp. 583-588 ◽  
Author(s):  
D. I. Bradley ◽  
S. N. Fisher ◽  
A. M. Gu�nault ◽  
R. P. Haley ◽  
H. Martin ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Low Temperatures ◽  
Superfluid 3He ◽  
High Magnetic Fields ◽  
Dynamic Texture

Grid Turbulence in Superfluid 3He-B at Low Temperatures

2007 ◽  
Vol 150 (3-4) ◽  
pp. 364-372 ◽  
Author(s):  
D. I. Bradley ◽  
S. N. Fisher ◽  
A. M. Guénault ◽  
R. P. Haley ◽  
M. Holmes ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Superfluid 3He ◽  
Grid Turbulence

scholarly journals Half-quantum vortices and walls bounded by strings in the polar-distorted phases of topological superfluid 3He

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
J. T. Mäkinen ◽  
V. V. Dmitriev ◽  
J. Nissinen ◽  
J. Rysti ◽  
G. E. Volovik ◽  
...  
Keyword(s):  
Superfluid 3He ◽  
Quantum Vortices ◽  
Topological Superfluid

Field-induced single molecule magnet behavior of a dinuclear cobalt(ii) complex: a combined experimental and theoretical study

2020 ◽  
Vol 49 (46) ◽  
pp. 16778-16790
Author(s):  
Abhisek Banerjee ◽  
Snehasis Banerjee ◽  
Carlos J. Gómez García ◽  
Samia Benmansour ◽  
Shouvik Chattopadhyay
Keyword(s):  
Magnetic Susceptibility ◽  
Single Molecule ◽  
Low Temperatures ◽  
Theoretical Study ◽  
Slow Relaxation ◽  
Single Molecule Magnet ◽  
Weak Ferromagnetic

Two cobalt(ii) dimers have been synthesized and structurally characterized. Magnetic susceptibility measurements show weak ferromagnetic couplings in both dimers but field-induced slow relaxation of the magnetization at low temperatures only in 2.

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