First-order phase transition induced by quantum fluctuations in Heisenberg helimagnets | Zendy

A. B. Harris | Zendy; E. Rastelli | Zendy

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First-order phase transition induced by quantum fluctuations in Heisenberg helimagnets

Author(s) -

A. B. Harris,

E. Rastelli

Publication year - 1988

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.340904

Subject(s) - physics , quantum phase transition , quantum critical point , ferromagnetism , condensed matter physics , zero point energy , ground state , quantum fluctuation , heisenberg model , phase transition , quantum , quantum mechanics , spin (aerodynamics) , spin wave , quantum limit , wave vector , quantum electrodynamics , thermodynamics

The ground‐state energy of a spin‐density wave of wave vector Q in a Heisenberg ferromagnet with competing interactions is calculated for small Q as EG (Q)=EG (0)+A1Q2 +A2Q4+ . . . . The coefficients A1 and A2 are calculated exactly at zero temperature in the limit as the ferromagnet to helix transition is approached. For some ranges of parameters we find that quantum zero point motion causes A2 to become negative thus leading to a first‐order transition not present in the classical system.

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