Universal low-temperature properties of quantum and classical ferromagnetic chains.
نویسندگان
چکیده
A number of recent papers have studied the finite temperature properties of ferromagnetic quantum spin chains. At low temperatures, macroscopic observables can be fully described by two dimensionful parameters which characterize the ground state. A convenient choice for these is the ground-state magnetization density M 0 , and the ground-state spin stiffness rs . Then the macroscopic properties of a quantum spin chain of length L , in the presence of an external magnetic field H , and at a temperature T are fully universal functions of the dimensionless ratios that can be formed out of these parameters. A convenient choice for these ratios is ~recall that in d51 rs , has dimensions of energy 3 length!
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عنوان ژورنال:
- Physical review. B, Condensed matter
دوره 54 2 شماره
صفحات -
تاریخ انتشار 1996