The average value of the spin squared operator as an order parameter for spin phase transitions without spontaneous lowering of symmetry

Kalita, VM; Levchenko, GG

Levchenko, GG (corresponding author), Jilin Univ, Int Ctr Future Sci, State Key Lab Superhard Mat, Changchun 130012, Peoples R China.; Levchenko, GG (corresponding author), NAS Ukraine, Donetsk Inst Phys & Engn, Prospekt Nauky 46, UA-03028 Kiev, Ukraine.

JOURNAL OF PHYSICS COMMUNICATIONS, 2020; 4 (9):

Abstract

Phase transitions from the low-spin to the high-spin state are a unique physical phenomenon without lowering of symmetry. In contrast to magnetic phas......

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