First principle computer simulations yield evidence of a finite superfluid response at low temperature of a parahydrogen cluster of 15 molecules in bulk superfluid He-4. The superfluid fraction is worth ~44% at T=0.25 K, growing to about 66% at T=0.15 K, i.e., it is substantially reduced compared to that of the same cluster in vacuo, due to higher molecular localization. The implications of these findings on the interpretation of experiments with linear molecules embedded in parahydrogen clusters immersed in superfluid helium are discussed.

中文翻译：

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超流体中副氢簇的超流体响应$$^4$$He

第一性原理计算机模拟产生了在低温下在本体超流体 He-4 中由 15 个分子组成的仲氢簇的有限超流体响应的证据。超流体分数在 T=0.25 K 时价值约 44%，在 T=0.15 K 时增长到约 66%，即，由于更高的分子定位，与真空中的相同簇相比，超流体分数显着减少。讨论了这些发现对解释嵌入超流氦中的仲氢簇中的线性分子的实验的意义。