Tuning the S=1/2 square-lattice antiferromagnet S r2Cu(T e1-x Wx) O6 from Néel order to quantum disorder to columnar order
Loading...
Access rights
openAccess
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal
View/Open full text file from the Research portal
Other link related to publication
View publication in the Research portal
View/Open full text file from the Research portal
Other link related to publication
Date
2018-08-13
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Physical Review B, Volume 98, issue 6
Abstract
The spin-1/2 square-lattice Heisenberg model is predicted to have a quantum disordered ground state when magnetic frustration is maximized by competing nearest-neighbor J1 and next-nearest-neighbor J2 interactions (J2/J1≈0.5). The double perovskites Sr2CuTeO6 and Sr2CuWO6 are isostructural spin-1/2 square-lattice antiferromagnets with Néel (J1 dominates) and columnar (J2 dominates) magnetic order, respectively. Here we characterize the full isostructural solid-solution series Sr2Cu(Te1-xWx)O6(0≤x≤1) tunable from Néel order to quantum disorder to columnar order. A spin-liquid-like ground state was previously observed for the x=0.5 phase, but we show that the magnetic order is suppressed below 1.5 K in a much wider region of x≈0.1-0.6. This coincides with significant T-linear terms in the low-temperature specific heat. However, density-functional theory calculations predict most of the materials are not in the highly frustrated J2/J1≈0.5 region square-lattice Heisenberg model. Thus, a combination of both magnetic frustration and quenched disorder is the likely origin of the spin-liquid-like state in x=0.5.Description
Keywords
Other note
Citation
Mustonen, O, Vasala, S, Schmidt, K P, Sadrollahi, E, Walker, H C, Terasaki, I, Litterst, F J, Baggio-Saitovitch, E & Karppinen, M 2018, ' Tuning the S=1/2 square-lattice antiferromagnet S r2Cu(T e1-x Wx) O6 from Néel order to quantum disorder to columnar order ', Physical Review B, vol. 98, no. 6, 064411 . https://doi.org/10.1103/PhysRevB.98.064411