Chemical disorder and spin-liquid-like magnetism in the van der Waals layered 5d transition metal halide Os0.55Cl2

McGuire, Michael A.; Zheng, Qiang; Yan, Jiaqiang; Sales, Brian C.

doi:10.1103/PhysRevB.99.214402

Title: Chemical disorder and spin-liquid-like magnetism in the van der Waals layered $5 d$ transition metal halide ${Os}_{0.55} {Cl}_{2}$

Journal Article · 03 June 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.99.214402 · OSTI ID:1564209

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, single crystals of the van der Waals layered 5d transition-metal compound Os_0.55Cl₂ were grown and characterized by x-ray diffraction, magnetization and heat-capacity measurements, and atomic resolution electron microscopy. The crystals are stable in air and easily cleaved. The structure is derived from the CdCl₂ structure type, with triangular layers of transition metal sites coordinated by edge-sharing octahedra of Cl and separated by a van der Waals gap. On average, only 55% of the metal sites are occupied by Os, and evidence for short- and long-ranged vacancy orders is observed by diffraction and real-space imaging. Magnetization data indicate magnetocrystalline anisotropy due to spin-orbit coupling, antiferromagnetic correlations, and no sign of magnetic order or spin freezing down to 0.4 K. Heat-capacity measurements in applied magnetic fields show only a broad, field-dependent anomaly. The magnetic susceptibility and heat capacity obey power laws at low temperature and low field with exponents close to 0.5. The power law behaviors of the low-temperature heat capacity and magnetic susceptibility suggest gapless magnetic fluctuations prevent spin freezing or ordering in Os_0.55Cl₂. Divergence of the magnetic Gruneisen parameter indicates nearness to a magnetic quantum critical point. Similarities to behaviors of spin-liquid materials are noted, and in total the findings suggest Os_0.55Cl₂ may be an example of a quantum spin liquid in the limit of strong chemical disorder.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1564209

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 21 Vol. 99; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Chemical disorder and spin-liquid-like magnetism in the van der Waals layered 5 d transition metal halide Os 0.55 Cl 2

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Title: Chemical disorder and spin-liquid-like magnetism in the van der Waals layered $5 d$ transition metal halide ${Os}_{0.55} {Cl}_{2}$