Open AccessFerromagnetic quantum phase transition in Co(S1-xSex)2 system
Author(s) -
Jiali Yang,
Hangdong Wang,
Jun Du,
Zhujun Zhang,
Minghu Fang
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.1195
Subject(s) - condensed matter physics , ferromagnetism , quantum critical point , electrical resistivity and conductivity , quantum phase transition , fermi liquid theory , materials science , phase transition , paramagnetism , transition temperature , physics , superconductivity , quantum mechanics
In Co(S1-xSex)2 system, a transition from ferromagnetic to paramagnetic state occurs near x = 0.11. In order to research the physical properties of the samples near this transition, polycrystalline samples of Co(S1-xSex)2 (0.0≤x≤0.16) were prepared. And their structure and resistivity were measured. It is found that the ferromagnetic transition temperature TC is suppressed by Se doping in the relation TC(1-x)1/2. And the ferromagnetic phase transition goes from the second to the first order. The temperature dependence of resistivity, ρ(T), shows a Fermi-liquid behavior, ρ(T)=ρ0+AT2, in Co(S1-xSex)2 (xρ(T) occurs in the samples near a critical concentration x=0.11. It is suggested that the phase transition near x=0.11 is a quantum phase transition, and the quantum critical spin fluctuation at zero temperature results in non-Fermi liquid behavior.