Renormalization-group study of superfluidity and phase separation of helium mixtures immersed in a disordered porous medium
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Superfluidity and phase separation in {sup 3}He-{sup 4}He mixtures immersed in aerogel are studied by renormalization-group theory. The quenched disorder imposed by aerogel, both at the atomic level and at the geometric level, is included. The calculation is conducted via the coupled renormalization-group mappings, near and away from aerogel, of the quenched probability distributions of random interactions. Random-bond effects on the onset of superfluidity and random-field effects on superfluid-superfluid phase separation are seen. The quenched randomness causes the {lambda} line of second-order phase transitions of superfluidity onset to reach zero temperature, in agreement with general predictions and experiments. The effects of the atomic and geometric randomness of aerogel are investigated separately and jointly. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544941
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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