Spin-singlet formation in the spin-tetramer layered organic-inorganic hybrid CH3NH3Cu2Cl5

Machteld Kamminga (Corresponding Author), Maria Azhar, Julian Zeisner, Anna Maria Catharina Maan, Bernd Büchner, Vladislav Kataev, Jacobus Baas, Graeme Blake, Maxim Mostovoy, Thomas Palstra

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Abstract

We report spin-singlet formation in an organic-inorganic hybrid identified as CH 3NH3Cu2Cl5. The hybrid adopts a layered structure in which Cu2Cl5− layers are separated by CH 3 NH3+ layers. The inorganic layers consist of corner- and edge-sharing CuCl6 octahedra, forming edge-sharing tetramers. Magnetic susceptibility measurements indicate strong antiferromagnetic interactions within the tetramers, whereas the coupling between the tetramers is weak. Low-temperature magnetic susceptibility data as well as electron spin resonance measurements suggest a nonmagnetic ground state with a large spin gap of ∼130K, in apparent contradiction with ferromagnetic interactions between nearest-neighbor spins. We discuss a spin-tetramer model in which antiferromagnetic next-nearest-neighbor interactions lead to a spin-singlet state.
Original languageEnglish
Article number064405
JournalPhysical review B: Covering condensed matter and materials physics
Volume2
Issue number6
DOIs
Publication statusPublished - 18 Jun 2018
Externally publishedYes

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