Title: Frustration of freezing in a two dimensional hard-core fluid due to particle shape anisotropy
Author(s):

	A. Huerta (Facultad de Fisica, Universidad Veracruzana, Circuito Gonzalo Aguirre Beltran s/n Zona Universitaria, Xalapa, Veracruz, C.P. 91000, Mexico) ,
	D. Tejeda (Facultad de Fisica, Universidad Veracruzana, Circuito Gonzalo Aguirre Beltran s/n Zona Universitaria, Xalapa, Veracruz, C.P. 91000, Mexico) ,
	D. Henderson (Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA) ,
	A. Trokhymchuk (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1SvientsitskiiSt., 79011 Lviv, Ukraine; Institute of Applied Mathematics and Fundamental Sciences, Lviv Polytechnic National University, 79013 Lviv, Ukraine)

The freezing mechanism suggested for a fluid composed of hard disks [Huerta et al., Phys. Rev. E, 2006, 74, 061106] is used here to probe the fluid-to-solid transition in a hard-dumbbell fluid composed of overlapping hard disks with a variable length between disk centers. Analyzing the trends in the shape of second maximum of the radial distribution function of the planar hard-dumbbell fluid it has been found that the type of transition could be sensitive to the length of hard-dumbbell molecules. From the NpT Monte Carlo simulations data we show that if a hard-dumbbell length does not exceed 15% the fluid-to-solid transition scenario follows the case of a hard-disk fluid, i.e., the isotropic hard-dumbbell fluid experiences freezing. However, for a hard-dumbbell length larger than 15% fluid-to-solid transition may change to continuous transition, i.e., such an isotropic hard-dumbbell fluid will avoid freezing.

Key words: hard disk fluid, hard-dumbbell fluid, radial distribution function, freezing transition
PACS: 64.60.Fr, 68.35.Rh

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