Partial Up-Up-Down Order with the Continuously Distributed Order Parameter in the Triangular Antiferromagnet TmMgGaO4

First order phase transition in the frustrated triangular antiferromagnet CsNiCl3.

By means of high-resolution ultrasonic velocity measurements, as a function of temperature and magnetic field, the nature of the different low temperatures magnetic phase transitions observed for the quasi-one-dimensional compound CsNiCl3 is established. Special attention has been devoted to the field-induced 120 degrees phase transition above the multicritical point in the H-T phase diagram wh...

Exact spectra, spin susceptibilities, and order parameter of the quantum Heisenberg antiferromagnet on the triangular lattice.

Exact spectra, spin susceptibilities and order parameter of the quantum Heisenberg antiferromagnet on the triangular lattice. Abstract Exact spectra of periodic samples are computed up to N = 36. Evidence of an extensive set of low lying levels, lower than the softest magnons, is exhibited. These low lying quantum states are degenerated in the thermodynamic limit; their symmetries and dynamics ...

Producing a Top-Down Parse Order with Bottom-up Parsing

An adaptation of the standard LR(1) and LALR(1) parsing algorithm is described such that a top-down parse order is produced rather than the standard bottom-up order. This work was supported by the Natural Sciences and Engineering Research Council of Canada, the Information Technology Research Centre of Ontario and Queen's University at Kingston. James Schmeiser is a developer in the IBM Canada ...

Partial Up and Down

This paper presents logics for reasoning about extension and reduction of partial information states. This enterprise amounts to non-persistent variations of certain constructive logics, in particular the so-called logic of constructible falsity of Nelson 1949]. We provide simple semantics, sequential calculi, completeness and decidability proofs. The most simple logical means for knowledge rep...

Partial Up and Down Logic