Frictional relaxation time of 3He normal fluid component in aerogel obtained by fourth sound resonance

C. Kato, T. Matsukura, Yusuke Nago, K. Obara, H. Yano, O. Ishikawa, T. Hata, S. Higashitani, K. Nagai

Research output: Contribution to journalArticle

Abstract

Recently, we revealed that the motion of the normal fluid component in the aerogel is well described by the frictional relaxation model (Higashitani et al. in Phys. Rev. B 71:134508, 2005). To clarify the origin of the friction between the quasiparitcles and the aerogel, we have performed the fourth sound resonance experiments at two different pressures. The fourth sound resonance experiment can derive both the static and the dynamic informations simultaneously, namely, the superfluid fraction and the energy loss. From the static part, we found that the superfluid fraction slightly changes with changing the pressure. We calculated the density of states in the impurity system by means of HSM and propose that the constituent of the normal fluid component is the quasiparticles at emerging levels in the energy gap, which we call the midgap states. From the dynamic part, we found that the energy loss depends on the pressure, in contrast to the superfluid fraction. The pressure dependence of the frictional relaxation time has been calculated, and we revealed that the response of the normal fluid component against the frictional force depends on the BCS coherence length.

Original languageEnglish
Pages (from-to)182-187
Number of pages6
JournalJournal of Low Temperature Physics
Volume158
Issue number1-2
DOIs
Publication statusPublished - 2010 Jan

Fingerprint

Aerogels
aerogels
Relaxation time
relaxation time
Acoustic waves
Fluids
acoustics
fluids
energy dissipation
Energy dissipation
pressure dependence
emerging
friction
impurities
Energy gap
Experiments
Impurities
Friction

Keywords

  • Aerogel
  • Hydrodynamics
  • Restricted geometry
  • Superfluid herium-3

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

Cite this

Frictional relaxation time of 3He normal fluid component in aerogel obtained by fourth sound resonance. / Kato, C.; Matsukura, T.; Nago, Yusuke; Obara, K.; Yano, H.; Ishikawa, O.; Hata, T.; Higashitani, S.; Nagai, K.

In: Journal of Low Temperature Physics, Vol. 158, No. 1-2, 01.2010, p. 182-187.

Research output: Contribution to journalArticle

Kato, C, Matsukura, T, Nago, Y, Obara, K, Yano, H, Ishikawa, O, Hata, T, Higashitani, S & Nagai, K 2010, 'Frictional relaxation time of 3He normal fluid component in aerogel obtained by fourth sound resonance', Journal of Low Temperature Physics, vol. 158, no. 1-2, pp. 182-187. https://doi.org/10.1007/s10909-009-0003-z
Kato, C. ; Matsukura, T. ; Nago, Yusuke ; Obara, K. ; Yano, H. ; Ishikawa, O. ; Hata, T. ; Higashitani, S. ; Nagai, K. / Frictional relaxation time of 3He normal fluid component in aerogel obtained by fourth sound resonance. In: Journal of Low Temperature Physics. 2010 ; Vol. 158, No. 1-2. pp. 182-187.
@article{ae7b53a5864549a9b6d07c46fc6fc2c3,
title = "Frictional relaxation time of 3He normal fluid component in aerogel obtained by fourth sound resonance",
abstract = "Recently, we revealed that the motion of the normal fluid component in the aerogel is well described by the frictional relaxation model (Higashitani et al. in Phys. Rev. B 71:134508, 2005). To clarify the origin of the friction between the quasiparitcles and the aerogel, we have performed the fourth sound resonance experiments at two different pressures. The fourth sound resonance experiment can derive both the static and the dynamic informations simultaneously, namely, the superfluid fraction and the energy loss. From the static part, we found that the superfluid fraction slightly changes with changing the pressure. We calculated the density of states in the impurity system by means of HSM and propose that the constituent of the normal fluid component is the quasiparticles at emerging levels in the energy gap, which we call the midgap states. From the dynamic part, we found that the energy loss depends on the pressure, in contrast to the superfluid fraction. The pressure dependence of the frictional relaxation time has been calculated, and we revealed that the response of the normal fluid component against the frictional force depends on the BCS coherence length.",
keywords = "Aerogel, Hydrodynamics, Restricted geometry, Superfluid herium-3",
author = "C. Kato and T. Matsukura and Yusuke Nago and K. Obara and H. Yano and O. Ishikawa and T. Hata and S. Higashitani and K. Nagai",
year = "2010",
month = "1",
doi = "10.1007/s10909-009-0003-z",
language = "English",
volume = "158",
pages = "182--187",
journal = "Journal of Low Temperature Physics",
issn = "0022-2291",
publisher = "Springer New York",
number = "1-2",

}

TY - JOUR

T1 - Frictional relaxation time of 3He normal fluid component in aerogel obtained by fourth sound resonance

AU - Kato, C.

AU - Matsukura, T.

AU - Nago, Yusuke

AU - Obara, K.

AU - Yano, H.

AU - Ishikawa, O.

AU - Hata, T.

AU - Higashitani, S.

AU - Nagai, K.

PY - 2010/1

Y1 - 2010/1

N2 - Recently, we revealed that the motion of the normal fluid component in the aerogel is well described by the frictional relaxation model (Higashitani et al. in Phys. Rev. B 71:134508, 2005). To clarify the origin of the friction between the quasiparitcles and the aerogel, we have performed the fourth sound resonance experiments at two different pressures. The fourth sound resonance experiment can derive both the static and the dynamic informations simultaneously, namely, the superfluid fraction and the energy loss. From the static part, we found that the superfluid fraction slightly changes with changing the pressure. We calculated the density of states in the impurity system by means of HSM and propose that the constituent of the normal fluid component is the quasiparticles at emerging levels in the energy gap, which we call the midgap states. From the dynamic part, we found that the energy loss depends on the pressure, in contrast to the superfluid fraction. The pressure dependence of the frictional relaxation time has been calculated, and we revealed that the response of the normal fluid component against the frictional force depends on the BCS coherence length.

AB - Recently, we revealed that the motion of the normal fluid component in the aerogel is well described by the frictional relaxation model (Higashitani et al. in Phys. Rev. B 71:134508, 2005). To clarify the origin of the friction between the quasiparitcles and the aerogel, we have performed the fourth sound resonance experiments at two different pressures. The fourth sound resonance experiment can derive both the static and the dynamic informations simultaneously, namely, the superfluid fraction and the energy loss. From the static part, we found that the superfluid fraction slightly changes with changing the pressure. We calculated the density of states in the impurity system by means of HSM and propose that the constituent of the normal fluid component is the quasiparticles at emerging levels in the energy gap, which we call the midgap states. From the dynamic part, we found that the energy loss depends on the pressure, in contrast to the superfluid fraction. The pressure dependence of the frictional relaxation time has been calculated, and we revealed that the response of the normal fluid component against the frictional force depends on the BCS coherence length.

KW - Aerogel

KW - Hydrodynamics

KW - Restricted geometry

KW - Superfluid herium-3

UR - http://www.scopus.com/inward/record.url?scp=73349142323&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=73349142323&partnerID=8YFLogxK

U2 - 10.1007/s10909-009-0003-z

DO - 10.1007/s10909-009-0003-z

M3 - Article

AN - SCOPUS:73349142323

VL - 158

SP - 182

EP - 187

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

SN - 0022-2291

IS - 1-2

ER -