Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Juha Martikainen"'
Autor:
Martin Ebner, Sandra Schön, Jesus Alcober, Roberto Bertonasco, Agnieszka Herczak-Ciara, Christian Hoppe, Juha Martikainen, Melanie Muchitsch, Joakim Petersson, Fernando M. da Silva
Publikováno v:
Ubiquity Proceedings, Pp 37-37 (2024)
In today's rapidly evolving educational landscape, European universities are increasingly relying on digital technologies for collaboration and learning. European Universities, as transnational alliances, aim to reshape higher education by fostering
Externí odkaz:
https://doaj.org/article/a7a92e5491de420281e51a06aa7cec20
Autor:
Juha Tuoriniemi, Sergey Boldarev, Elias Pentti, George R. Pickett, Juha Martikainen, Alexander Sebedash
Publikováno v:
Journal of Low Temperature Physics. 129:531-545
Search for the superfluid state of dilute 3He dissolved to 4He is one of the major remaining problems of low temperature physics. We describe our two experiments designed to pursue the lowest achieved temperature in such mixtures essentially below th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88134b0d732ac354920b7d4ab40ce052
https://doi.org/10.1023/a:1021468614550
https://doi.org/10.1023/a:1021468614550
Publikováno v:
Journal of Low Temperature Physics. 126:139-144
We present our first high resolution vibrating wire resonator data on dilute 3He-4He mixtures at ultra low temperatures. Measurements were performed at saturated vapor pressure with 3He concentrations below the phase separation limit. The behavior of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be184a81ecb8fe0900401b3ef059fd01
https://doi.org/10.1023/a:1013735421595
https://doi.org/10.1023/a:1013735421595
Autor:
Juha Tuoriniemi, Juha Martikainen
Publikováno v:
Journal of Low Temperature Physics. 124:367-382
We describe a simple coupling scheme of superconducting vibrating wire resonators to a SQUID amplifier for achieving supreme signal to noise characteristics. Our construction resulted in a gain factor near 108φ0/V at 1kHz with an amplifier noise lev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b10635946b36aa5d4e9f3ba124a35b5
https://doi.org/10.1023/a:1017554708219
https://doi.org/10.1023/a:1017554708219
Publikováno v:
Journal of Materials Science. 36:839-844
We present a systematic investigation of conditions for heat treatment of Rh with the aim of increasing the residual resistivity ratio (RRR). The maximal value of RRR for a 25 μm thick foil was found to be 1050 and the optimal treatment conditions w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b02778ca7d049ed414df7fd77ed9fd6a
https://doi.org/10.1023/a:1004874412227
https://doi.org/10.1023/a:1004874412227
Publikováno v:
Journal of Low Temperature Physics. 120:121-150
A new cascade nuclear demagnetization cryostat has been designed and constructed. Our aim was to build a versatile, modular cryostat, with a large experimental space providing an excellent platform for various types of ultralow temperature measuremen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d300311ae71e6dca218cf99ac28b6d66
https://doi.org/10.1023/a:1004665020659
https://doi.org/10.1023/a:1004665020659
Publikováno v:
Physical Review Letters. 70:2818-2821
We have measured the dynamic susceptibility of polycrystalline rhodium foils down to 280 pK and up to -750 pK. These record-low and -high nuclear spin temperatures were reached by adiabatic demagnetization using initial polarizations of 83 and -60%.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c70257e2c7258fb49506397c9410106
https://doi.org/10.1103/physrevlett.70.2818
https://doi.org/10.1103/physrevlett.70.2818
Publikováno v:
Physica B: Condensed Matter. :178-179
We present our vibrating wire resonator data on dilute mixtures. Measurements have been performed for two saturated 3He concentrations and pressures (x=6.5%, p=0 bar and x=9.5%, p=10.2 bar). A DC SQUID readout of the resonator gave a good signal to n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::029de6bd57e7d0764d883f9066c4a19a
https://doi.org/10.1016/s0921-4526(02)01935-x
https://doi.org/10.1016/s0921-4526(02)01935-x
Publikováno v:
Physica B: Condensed Matter. :1700-1701
We have observed the double-spin-#ip mode, corresponding to one photon #ipping two nuclear spins, in rhodium with low-frequency SQUID NMR at ultralow temperatures. The shift and magnitude of the absorption line at around twice the Larmor frequency ha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1da319ebbdf1139c422ab88bdeb0d405
https://doi.org/10.1016/s0921-4526(99)02944-0
https://doi.org/10.1016/s0921-4526(99)02944-0
Autor:
Weijun Yao, T. A. Knuuttila, K. Lefmann, Juha Martikainen, Olli V. Lounasmaa, K. K. Nummila, A. S. Oja
Publikováno v:
Czechoslovak Journal of Physics. 46:2793-2794
A new cascade nuclear demagnetization cryostat has been designed and constructed. Our aim has been to build a versatile, modular cryostat with a large experimental space providing an excellent platform for various types of ultra-low temperature measu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd6986585ea6c5f61bbe1e3d493bfb81
https://doi.org/10.1007/bf02570383
https://doi.org/10.1007/bf02570383