Abstract

A new fluorophosphate PbCuPO4F was obtained by a hydrothermal method, which is found to crystallize in the monoclinic system with a P21/c space group, exhibiting a tunnel structure built by distorted CuO4F square-pyramids and PO4 tetrahedra. Magnetic measurements show that this compound possesses a short-range magnetic order at ∼7.9 ​K without any antiferromagnetic transitions down to 2 ​K, indicating a singlet ground state. The fit using a modified spin-dimer model indicates intradimer interaction J/kB ​= ​12.2 ​K and interdimer interaction J’/kB ​= ​3.5 ​K in the system, while the critical field for the spin gap between the singlet ground state (S ​= ​0) and the excited triplet state (S ​= ​1) is observed at Hc ​= ​∼4.7 ​T. Although PbCuPO4F and BaCuPO4F have a similar tunnel structure, their magnetic behaviors are remarkably different. This may be due to a slight change of interaction exchange in PbCuPO4F, leading to a coupled spin-dimer of Cu–O–P–O–Cu pathway in the 4-column tunnels. Also, solid-state UV–vis diffuse reflectance spectra show that PbCuPO4F has a wide optical band gap of 3.42 ​eV.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.