Výsledky vyhledávání - "J. M. Kyynäräinen"

Two-phonon absorption by the real squashing mode in superfluidB3

Autor: Jukka P. Pekola, Ross H. McKenzie, J. M. Kyynäräinen, K. Torizuka, Antti Manninen

Publikováno v: Physical Review Letters. 66:3152-3155

We have observed in superfluid {sup 3}He-{ital B} two-phonon absorption, which is one of the nonlinear effects recently predicted by McKenzie and Sauls. The {ital J}=2{sup +} real squashing mode was excited with two coincident sound pulses at the tem

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5aea482b747e5853bf9d585fd96e0582
https://doi.org/10.1103/physrevlett.66.3152

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The re-entrant normal flapping mode in the dipolar boundary layers of 3he-a

Autor: J. M. Kyynäräinen, W. Wojtanowski, Antti Manninen, K. Torizuka, Jukka P. Pekola, G. K. Tvalashvili

Publikováno v: Pekola, J P, Torizuka, K, Kyynarainen, J M, Manninen, A J, Wojtanowski, W & Tvalashvili, G K 1990, ' The re-entrant normal flapping mode in the dipolar boundary layers of 3he-a ', EPL, vol. 13, no. 2, pp. 155-160 . https://doi.org/10.1209/0295-5075/13/2/010

Zero sound experiments on superfluid 3He-A at low pressures (< 3 bar) and in strong magnetic fields (>0.3T) show an increase in the attenuation at low temperatures (6 0.4 mK) which has been a puzzle until the present experiment. Coupling of the re-en

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4419bae02a707774bc05d0ff056dd49a
https://cris.vtt.fi/en/publications/9753911c-ae83-4548-a907-dbcfaee0176f

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Superfluid ^{3}He in strong magnetic fields: Anomalous sound attenuation in the B phase and evidence for splitting of the AB transition

Autor: Jukka P. Pekola, Antti Manninen, J. M. Kyynäräinen, K. Torizuka

Publikováno v: Kyynäräinen, J M, Pekola, J P, Manninen, A J & Torizuka, K 1990, ' Superfluid He3 in strong magnetic fields : Anomalous sound attenuation in the B phase and evidence for splitting of the AB transition ', Physical Review Letters, vol. 64, no. 9, pp. 1027-1030 . https://doi.org/10.1103/PhysRevLett.64.1027

Zero sound attenuation at 8.9 and 26.8 MHz in {sup 3}He-{ital B} shows an extremum at {ital T}{sub {ital AB}} in a field of {approx}2 kG at low pressures, both in the stationary and in the rotating superfluid. This is in accordance with the predictio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2fb8136351901b9eb6ebe42ec0b7254
https://doi.org/10.1103/physrevlett.64.1027

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The new SMC dilution refrigerator

Autor: J. M. Kyynäräinen, M. P. Berglund, T. O. Niinikoski

Publikováno v: AIP Conference Proceedings.

The dilution refrigerator for the SMC twin solid polarized target at CERN is by far the largest one in operation. The 2.5 liter, 1.5 m long target is loaded horizontally into the cold mixing chamber. A cooling power of 400 mW at 300 mK temperature is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9f446c05611de3d57cf4c3f825e8b538
https://doi.org/10.1063/1.48921

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Zero-sound attenuation in rotating and stationary3He-A and3He-B

Autor: J. M. Kyynäräinen, Jukka P. Pekola, Antti Manninen, A. V. Babkin, K. Torizuka

Publikováno v: Kyynäräinen, J M, Pekola, J P, Torizuka, K, Manninen, A J & Babkin, A V 1991, ' Zero-sound attenuation in rotating and stationary 3 He-A and 3 He-B ', Journal of Low Temperature Physics, vol. 82, no. 5-6, pp. 325-367 . https://doi.org/10.1007/BF00681423

We report on measurements of zero-sound attenuation in rotating and stationary3He-A and3He-B, in magnetic fields up to 350 mT. Strong and highly nonlinear rotation speed dependencies of sound amplitudes have been observed in both phases. The data giv

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e12fe02095795be6fa21fdb00c6bd63
https://cris.vtt.fi/en/publications/f251c59e-e49a-423f-acd4-60e5fb94a85f

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Ultrasonic investigations of vortex textures in 3HeA

Autor: Jukka P. Pekola, J. M. Kyynäräinen, Antti Manninen, K. Torizuka

Publikováno v: Kyynarainen, J M, Pekola, J P, Torizuka, K & Manninen, A J 1990, ' Ultrasonic investigations of vortex textures in 3 HeA ', Physica B: Physics of Condensed Matter, vol. 165-166, no. PART 1, pp. 619-620 . https://doi.org/10.1016/S0921-4526(90)81159-L

Zero sound attenuation has been used to probe vortex textures in rotating 3HeA. The highly nonlinear rotation speed dependencies of the measured sound amplitudes can be explained partly as being due to sonic velocity gradients in the vortex cores. Ca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5905e3a31c1cbfc0f383276f42638c7
https://cris.vtt.fi/en/publications/96cae7a0-4f2c-4bc9-8e8e-a29be97b1d54

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Ultrasonic experiments on rotating superfluid 3HeA1

Autor: G. K. Tvalashvili, K. Torizuka, Olli V. Lounasmaa, J. M. Kyynäräinen, Jukka P. Pekola, Antti Manninen

Publikováno v: Torizuka, K, Pekola, J P, Kyynäräinen, J M, Manninen, A J, Lounasmaa, O V & Tvalashvili, G K 1990, ' Ultrasonic experiments on rotating superfluid 3 HeA 1 ', Physica B: Physics of Condensed Matter, vol. 165-166, no. PART 1, pp. 623-624 . https://doi.org/10.1016/S0921-4526(90)81161-G

The first experiments on rotating 3HeA1 have been done using pulsed zero sound transmission techniques at several pressures in magnetic fields up to 1 T. Preliminary analysis of our data by a geometrical acoustics method suggests that the vortex core

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b6c6b650ef1898430c06d16ebe27157b
https://doi.org/10.1016/s0921-4526(90)81161-g

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Rotating 3HeA2in the vicinity of the transition to the Al phase

Autor: J. M. Kyynäräinen, G.A. Kharadze, B.N. Kiviladze

Publikováno v: Kiviladze, B N, Kharadze, G A & Kyynäräinen, J M 1990, ' Rotating 3 HeA 2 in the vicinity of the transition to the A l phase ', Physica B: Physics of Condensed Matter, vol. 165-166, no. PART 1, pp. 631-632 . https://doi.org/10.1016/S0921-4526(90)81165-K

We show that, owing to a decrease in the dipolar energy, the soft cores of the nonsingular, doubly quantized vortices in 3HeA2 expand and become ellipsoidal upon approaching the A1 phase. Results of zero sound experiments in rotating 3HeA2, very near

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d42407ec220bda563c109f830d5e5787
https://doi.org/10.1016/s0921-4526(90)81165-k

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Zero sound experiments on the distorted b phase and in the BA transition region at low pressures

Autor: K. Torizuka, J. M. Kyynäräinen, Jukka P. Pekola, Antti Manninen

Publikováno v: Pekola, J P, Kyynäräinen, J M, Manninen, A J & Torizuka, K 1990, ' Zero sound experiments on the distorted b phase and in the BA transition region at low pressures ', Physica B: Physics of Condensed Matter, vol. 165-166, no. PART 1, pp. 613-614 . https://doi.org/10.1016/S0921-4526(90)81156-I

Zero sound at 8.9 and 26.8 MHz, propagating parallel with the magnetic field, shows an attenuationmaximumalongtheTB A line in a field of∼ 2 kG at low pressures. This is in accordance with the theoretical prediction that a critical magnetic field se

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec51400ea3ae69ae257c57df8dac8196
https://doi.org/10.1016/S0921-4526(90)81156-I

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Ultrasonic investigation of rotating3He-B in strong magnetic fields

Autor: Antti Manninen, Jukka P. Pekola, K. Torizuka, J. M. Kyynäräinen

Publikováno v: Manninen, A J, Kyynarainen, J M, Torizuka, K & Pekola, J P 1990, ' Ultrasonic investigation of rotating 3 He-B in strong magnetic fields ', Physica B: Physics of Condensed Matter, vol. 165-166, no. PART 1, pp. 669-670 . https://doi.org/10.1016/S0921-4526(90)81184-P

We have studied ultrasonic attenuation in rotating 3He-B at low pressures (< 10 bar) in magnetic fields up to 300 mT. In a strong field, the energy gap Δ in 3He-B is anisotropic, and the attenuation α of zero sound depends on the orientation of Δ.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34abdf0a0907a0a78b10b607e3ca46ab
https://doi.org/10.1016/s0921-4526(90)81184-p

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