TY - JOUR
T1 - Spin-singlet ground state of the coupled Jeff = 1/2 alternating chain system Sr2 Co(SeO3)3
AU - Panneer Muthuselvam, I.
AU - Madhumathy, R.
AU - Saranya, K.
AU - Moovendaran, K.
AU - Lee, Suheon
AU - Choi, Kwang-Yong
AU - Chen, Wei-Tin
AU - Wang, Chin-Wei
AU - Chen, Peng-Jen
AU - Ponmurugan, M.
AU - Ou, Min-Nan
AU - Chen, Yang-Yuan
AU - Kim, Heung-Sik
AU - Sankar, R.
PY - 2022/12/1
Y1 - 2022/12/1
N2 - We report a detailed study of the structural, magnetic, thermodynamic, and electronic properties of a coupled Jeff = 1/2 alternating chain Sr2Co(SeO3)3 compound using magnetic susceptibility χ(T), magnetic specific heat Cm(T), magnetization, and neutron diffraction measurements along with first-principles calculations. The first-principles calculations based on the density functional theory suggest that Sr2Co(SeO3)3 forms a quasi-one-dimensional chain with bond alternation and interchain interactions. χ(T), Cm(T), and neutron powder diffraction measurements confirm that no long-range magnetic ordering occurs down to 100 mK. Instead, a maximum in χ(T) and Cm(T) and an exponential drop of χ(T) and Cp(T) as T → 0 K point to a spin-singlet ground state. The analysis of χ(T) and Cm(T) based on a J1-J2 alternating Heisenberg model shows the bond alternation α = J2/J1 ≈ 0.7 and a spin gap of Δ ≈ 3 K. Our work demonstrates that Sr2Co(SeO3)3 is a coupled alternating chain system based on spin-orbit entangled Jeff = 1/2.
AB - We report a detailed study of the structural, magnetic, thermodynamic, and electronic properties of a coupled Jeff = 1/2 alternating chain Sr2Co(SeO3)3 compound using magnetic susceptibility χ(T), magnetic specific heat Cm(T), magnetization, and neutron diffraction measurements along with first-principles calculations. The first-principles calculations based on the density functional theory suggest that Sr2Co(SeO3)3 forms a quasi-one-dimensional chain with bond alternation and interchain interactions. χ(T), Cm(T), and neutron powder diffraction measurements confirm that no long-range magnetic ordering occurs down to 100 mK. Instead, a maximum in χ(T) and Cm(T) and an exponential drop of χ(T) and Cp(T) as T → 0 K point to a spin-singlet ground state. The analysis of χ(T) and Cm(T) based on a J1-J2 alternating Heisenberg model shows the bond alternation α = J2/J1 ≈ 0.7 and a spin gap of Δ ≈ 3 K. Our work demonstrates that Sr2Co(SeO3)3 is a coupled alternating chain system based on spin-orbit entangled Jeff = 1/2.
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U2 - 10.1103/PhysRevB.106.214417
DO - 10.1103/PhysRevB.106.214417
M3 - 21_Publication in refereed journal
VL - 106
JO - Physical Review B: covering condensed matter and materials physics
JF - Physical Review B: covering condensed matter and materials physics
SN - 2469-9950
IS - 21
M1 - 214417
ER -