We have investigated the critical behavior near the ferromagnetic transition of TlCoS single crystals and the magnetic properties of Tl(CoNi)S by means of magnetization measurements. The obtained critical exponents β, γ and δ of TlCoS could basically satisfy the scaling equations and are found very close to the prediction of the tricritical mean-field theory. 5[Formula: see text] Ni doping drives the system to an antiferromagnetic ground state which is unstable to magnetic field, yielding metamagnetic transition. The possible existence of a tricritical point (TCP) in Tl(CoNi)S is also discussed.
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| http://dx.doi.org/10.1088/1361-648X/aacbb4 | DOI Listing |
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