We determine the critical exponents for the XY universality class in three dimensions, which is expected to describe the lambda transition in He-4. They are obtained from the analysis of high-temperature series computed for a two-component lambda phi(4) model. The parameter lambda is fixed such that the leading corrections to scaling vanish. We obtain v= 0.67166(55), gamma= 1.3179(11), and alpha= -0.0150(17). These estimates improve previous theoretical determinations and agree with the more precise experimental results for liquid helium.
Determination of the Critical Exponents for the lambda-Transition of 4He by Improved High-Temperature Expansion / M., Campostrini; Pelissetto, Andrea; P., Rossi; E., Vicari. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 61:(2000), pp. 5905-5908. [10.1103/PhysRevB.61.5905]
Determination of the Critical Exponents for the lambda-Transition of 4He by Improved High-Temperature Expansion
PELISSETTO, Andrea;
2000
Abstract
We determine the critical exponents for the XY universality class in three dimensions, which is expected to describe the lambda transition in He-4. They are obtained from the analysis of high-temperature series computed for a two-component lambda phi(4) model. The parameter lambda is fixed such that the leading corrections to scaling vanish. We obtain v= 0.67166(55), gamma= 1.3179(11), and alpha= -0.0150(17). These estimates improve previous theoretical determinations and agree with the more precise experimental results for liquid helium.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
