Rigidity transitions in binary Ge–Se glasses and the intermediate phase

Abstract Raman scattering measurements, undertaken on bulk GexSe1−x glasses at 0 (ν ES ) Ge ( Se 1/2 ) 4 mode frequencies. A second-order transition from a floppy to an unstressed rigid phase occurs near xc(1)=0.20(1) where both νCS(x) and νES(x) show a kink. A first-order transition from an unstressed rigid to a stressed rigid phase occurs near xc(2)=0.26(1), where νCS2(x) displays a step-like discontinuity between x=0.25 and 0.26 and a power-law behavior at x>xc (2). In sharp contrast, earlier micro-Raman measurements that use at least three orders of magnitude larger photon flux to excite the scattering, showed only one rigidity transition near xc=0.23, the mid-point of the intermediate phase (xc(1)

[1]  P. Boolchand,et al.  Direct Evidence for Stiffness Threshold in Chalcogenide Glasses , 1997 .

[2]  Punit Boolchand,et al.  Stiffness transitions inSixSe1−xglasses from Raman scattering and temperature-modulated differential scanning calorimetry , 2000 .

[3]  William A. Goddard,et al.  Nature of the chemical bond , 1986 .

[4]  Matthieu Micoulaut,et al.  Glass structure, rigidity transitions and the intermediate phase in the Ge–As–Se ternary , 2000 .

[5]  J. M. Oshorn.  Proc. Nat. Acad. Sei , 1978 .

[6]  Tersoff,et al.  Elastic properties of a network model of glasses. , 1992, Physical review letters.

[7]  C. Angell,et al.  Correlations of the nonexponentiality and state dependence of mechanical relaxations with bond connectivity in Ge-As-Se supercooled liquids. , 1992, Physical review. B, Condensed matter.

[8]  David Alan Drabold,et al.  AB INITIO MOLECULAR-DYNAMICS STUDY OF LIQUID GESE2 , 1997 .

[9]  M. Micoulaut,et al.  A theoretical model of formation of covalent binary glasses. I. General setting , 1994 .

[10]  P. Boolchand,et al.  Thermally reversing window and stiffness transitions in chalcogenide glasses , 1999 .

[11]  J. C. Phillips,et al.  Topology of covalent non-crystalline solids I: Short-range order in chalcogenide alloys , 1979 .

[12]  M. Thorpe,et al.  Rigidity theory and applications , 2002 .

[13]  Salmon,et al.  Defects in a disordered world: the structure of glassy GeSe2 , 2000, Physical review letters.

[14]  J. C. Phillips.  Nature and scaling properties of the intermediate phase of the impurity band metal–insulator transition , 1999 .

[15]  Neumann,et al.  Vibrational densities of states and network rigidity in chalcogenide glasses. , 1991, Physical review. B, Condensed matter.

[16]  Thorpe,et al.  Elastic properties of glasses. , 1985, Physical review letters.

[17]  Boolchand,et al.  Rigidity percolation and molecular clustering in network glasses. , 1986, Physical review letters.

[18]  Rémi Monasson,et al.  Determining computational complexity from characteristic ‘phase transitions’ , 1999, Nature.

[19]  Michael Thorpe,et al.  Continuous deformations in random networks , 1983 .

[20]  M. Micoulaut,et al.  Glass transition temperature variation, cross-linking and structure in network glasses: A stochastic approach , 1999, cond-mat/9906190.

[21]  Punit Boolchand,et al.  Insulating and Semiconducting Glasses , 2000 .