HIGH-PRESSURE MEASUREMENTS OF THE ISOTOPIC SHIFT IN THE MELTING CURVE OF HE

被引：14
|
作者：
LOUBEYRE, P
LETOULLEC, R
PINCEAUX, JP
机构：
[1] Physique des Milieux Condensés, Université Paris 6, Boite 77, 75252 Paris
来源：
PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.69.1216
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The isotopic shift in the melting curve of He has been measured between 70 and 260 K. An exponential divergence from accurate path-integral Monte Carlo calculations is observed which leads to an opposite isotopic shift above 200 K. The same measurements have also been performed in isotopic H-2 at 296 K where a reasonable agreement with theory is obtained. Tentative explanations of this puzzling discrepancy in He are discussed: importance of many-body forces, breakdown of the Born-Oppenheimer approximation, and importance of statistics.
引用
收藏
页码：1216 / 1219
页数：4
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