Pulsed NMR Measurements in Superfluid 3He in Aerogel of 97.5 % Porosity

Journal Article · Thu Sep 07 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2354680· OSTI ID:20877565

Ishikawa, Osamu; Kado, Ryusuke; Obara, Ken; Yano, Hideo; Hata, Tohru ^[1]; Nakagawa, Hisashi ^[2]; Yokogawa, Hiroshi; Yokoyama, Masaru ^[3]

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1. Graduate School of Science, Osaka City University, Osaka 558-8585 (Japan)
2. Metrology Institute of Japan, Advanced Industrial Science and Technology Tsukuba, 305-8563 (Japan)
3. Matsushita Electric Works Ltd. Kadoma, Osaka, 571-0500 (Japan)

Aerogel is made of thin SiO2 strands of a few nanometer diameter. Since the coherence length of superfluid 3He is much longer than the silica strand diameter and is nearly the same as the mean distance between silica strands, aerogel gives us a chance to study the effects of an impurity in superfluid 3He. To investigate what superfluid states are formed in aerogel, we performed a pulsed NMR experiment. Both the A-like and B-like phases show a tipping angle dependent frequency shift in the FID signal after an rf pulse. The dependence in the A-like phase is well explained by an expectation based on the ''robust phase'' introduced by Fomin, while the FID frequencies in the B-like phase behave similarly to those observed in the bulk B phase in a slab geometry with the initial condition of a non-Leggett configuration.

• OSTI ID: 20877565
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 850; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COHERENCE LENGTH
DISTANCE
GELS
HELIUM 3
IMPURITIES
NUCLEAR MAGNETIC RESONANCE
POROSITY
PULSES
SILICA
SUPERFLUIDITY