TY - JOUR
T1 - A new multicritical point in anisotropic magnets. I. Ferromagnet in a random longitudinal field
AU - Galam, S.
AU - Aharony, A.
PY - 1980
Y1 - 1980
N2 - Mean-field and renormalisation group theories are used to study the diagrams of anisotropic n-component d-dimensional magnetic systems with a uniaxially random magnetic field along the easy axis. For strong anisotropy only the longitudinal phase exists. The transition into this phase exhibits a tricritical point. When the anisotropy is decreased, a 'transverse' or 'spin-flopped' phase appears for low temperatures and large values of the random field. This phase is separated from the longitudinal one by a spin-flop first-order line, ending at a critical end-point. For very weak anisotropy, a bicritical point appears in the phase diagram. For a certain value of the anisotropy the critical end-point, the bicritical point and the tricritical point all coincide defining a new multicritical point.
AB - Mean-field and renormalisation group theories are used to study the diagrams of anisotropic n-component d-dimensional magnetic systems with a uniaxially random magnetic field along the easy axis. For strong anisotropy only the longitudinal phase exists. The transition into this phase exhibits a tricritical point. When the anisotropy is decreased, a 'transverse' or 'spin-flopped' phase appears for low temperatures and large values of the random field. This phase is separated from the longitudinal one by a spin-flop first-order line, ending at a critical end-point. For very weak anisotropy, a bicritical point appears in the phase diagram. For a certain value of the anisotropy the critical end-point, the bicritical point and the tricritical point all coincide defining a new multicritical point.
UR - http://www.scopus.com/inward/record.url?scp=33644889760&partnerID=8YFLogxK
U2 - 10.1088/0022-3719/13/6/016
DO - 10.1088/0022-3719/13/6/016
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AN - SCOPUS:33644889760
SN - 0022-3719
VL - 13
SP - 1065
EP - 1081
JO - Journal of Physics C: Solid State Physics
JF - Journal of Physics C: Solid State Physics
IS - 6
M1 - 016
ER -