corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 97 » Issue 16
< Previous Article | Next Article >

Phys. Rev. Lett. 97, 165302 (2006) [4 pages]

Melting Curve of 4He: No Sign of a Supersolid Transition down to 10 mK

Download: PDF (218 kB) Buy this article Export: BibTeX or EndNote (RIS)

I. A. Todoshchenko*, H. Alles, J. Bueno†, H. J. Junes, A. Ya. Parshin‡, and V. Tsepelin§
Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland

Received 10 July 2006; published 20 October 2006

We have measured the melting curve of 4He in the temperature range from 10 to 400 mK with the accuracy of about 0.5  μbar. Crystals of different quality show the expected T4 dependence in the range from 80 to 400 mK without any sign of the supersolid transition, and the coefficient is in excellent agreement with available data on the sound velocity in liquid 4He and on the Debye temperature of solid 4He. Below 80 mK, we have observed a small deviation from T4 dependence, which, however, cannot be attributed to the supersolid transition, because instead of decrease the entropy of the solid rather remains constant, about 2.5×10-6 R.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.165302
DOI:
10.1103/PhysRevLett.97.165302
PACS:
67.80.−s, 05.70.−a, 67.40.Db

*Electronic address: todo@boojum.hut.fi

†Present address: Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, Leiden, 2300 RA, The Netherlands.

‡Present address: P. L. Kapitza Institute, Kosygina 2, Moscow 119334, Russia.

§Present address: Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom.

See Also

See Also: Ann Sophie Rittner and John D. Reppy, Observation of Classical Rotational Inertia and Nonclassical Supersolid Signals in Solid 4He below 250 mK, Phys. Rev. Lett. 97, 165301 (2006).

 
< Previous Article | Next Article >