An X-Y antiferromagnet

Within effective field theory we explore the properties of the d=3+1 quantum XY model at low temperatures and in weak magnetic or staggered fields. For this parameter regime only few results appear to be known, and furthermore are restricted to one-loop order. In the present study we systematically analyze the thermodynamics of the d=3+1 quantum XY model up to three-loop order. In the low-temperature expansion of the free energy density, the free Bose gas term of order T 4 receives corrections of order T 6 and T 8 . The discussion also includes the pressure, (staggered) magnetization and susceptibility. In particular, we show how these quantities are influenced by the spin-wave interaction. We then compare our findings with those for the quantum XY model in d=2+1.

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An X-Y antiferromagnet

Cited by 3 publications

References 5 publications

An anisotropic antiferromagnet with extension to the Ising limit

An anisotropic antiferromagnet with extension to the Ising limit

Green function theory of a Heisenberg antiferromagnet

Thermodynamics of thed = 3 + 1 quantumXYmodel

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