Size-dependent Kosterlitz-Thouless superfluid transition in thin 4He films adsorbed on porous glasses.
Size-dependent Kosterlitz-Thouless superfluid transition in thin 4He films adsorbed on porous glasses.
复制标题
吸附在多孔玻璃上的 4He 薄膜中的尺寸依赖性 Kosterlitz-Thouless 超流体转变。
DOI：
10.1103/physrevlett.64.1541
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发表时间：
1990
影响因子：
8.6
通讯作者：
Takashi Watanabe
中科院分区：
文献类型：
--
作者：
K. Shirahama;Minoru Kubota;S. Ogawa;N. Wada;Takashi Watanabe
We report the first quantitative study of the size-dependent suprefluid transition in {sup 4}He films adsorbed on porous glasses with pore diameters {ital d} from 50 to 10 000 A. {ital T}{sub {ital c}} for the submonolayer films decreases as {ital d} increases up to {ital d}=2900 A, whereas {ital T}{sub {ital c}} for the full-pore liquid increases with {ital d}. The {ital d} dependence of {ital T}{sub {ital c}} and the dissipation at the transition for the films reveal that the vortex-pair unbinding on length scales smaller than the pore sizes determines the superfluid transition. We obtain the diameter of vortex core {ital a}{sub 0}=25{plus minus}12 A from the fit by letting the 2D coherence length {xi}{sub 2}{sup +}({ital T}{sub {ital c}})={pi}{ital d}/2.
We report the first quantitative study of the size-dependent suprefluid transition in {sup 4}He films adsorbed on porous glasses with pore diameters {ital d} from 50 to 10 000 A. {ital T}{sub {ital c}} for the submonolayer films decreases as {ital d} increases up to {ital d}=2900 A, whereas {ital T}{sub {ital c}} for the full-pore liquid increases with {ital d}. The {ital d} dependence of {ital T}{sub {ital c}} and the dissipation at the transition for the films reveal that the vortex-pair unbinding on length scales smaller than the pore sizes determines the superfluid transition. We obtain the diameter of vortex core {ital a}{sub 0}=25{plus minus}12 A from the fit by letting the 2D coherence length {xi}{sub 2}{sup +}({ital T}{sub {ital c}})={pi}{ital d}/2.