Low Temperature Physics: 34, 344 (2008); https://doi.org/10.1063/1.2911653 (7 pages)
Fizika Nizkikh Temperatur: Volume 34, Number 4-5 (April 2008), p. 431-439    ( to contents , go back )

Formation of a glassy phase in solid 4He. Contribution to the pressure in the supersolidity region

V.N. Grigor'ev, V.A. Maidanov, V.Yu. Rubanskii, S.P. Rubets, E.Ya. Rudavskii, A.S. Rybalko, and V.A. Tikhii

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: rubanskiy@ilt.kharkov.ua
pos Анотація:

Received November 15, 2007

Abstract

High-precision pressure measurements in solid 4He, grown by the capillary blocking technique, have been made in a temperature range from 50 to 800 mK on crystals of different quality, both fresh-grown and well-annealed. In unannealed crystals, the temperature dependence of pressure demonstrates a contribution proportional to T2, which dominates at temperatures T < 300 mK, where an abnormal behavior attributed to «supersolidity» has been previously observed. Such a pressure behavior is specific to glassy phase. The contribution of a glassy phase was not observed practically in well-annealed samples. The effect observed testifies that the glassy phase is formed rather easily in solid helium with a high concentration of nonequilibrium defects. An abnormally drastic pressure relaxation in poor-quality samples was registered at temperatures close to the melting point. Possible reasons for this effect are discussed.

PACS: 67.80.–s Quantum solids.

Key words: solid 4He, glassy phase, noneequilibrium defects.

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