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Experimental Evidences for Quantum Spin Liquid Ground State in Layered Hexagonal Y2CuTiO6

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Abstract

Quantum spin liquid ground state has been observed in Y2CuTiO6. The compound was prepared using solid-state synthesis method. Y2CuTiO6 crystallized in non-perovskite hexagonal structure with space group, P63cm (#185). Ti4+ and Cu2+ ions are distributed randomly in the B site along the ab-plane with trigonal bipyramidal coordination of oxygen ions and separated along the c-axis by Y-O7 layers. Ambient-temperature Raman spectra revealed vibrational modes corresponding to hexagonal structure. The Raman spectrum displayed multiple low-intensity, broad peaks that could have resulted as a consequence of charge and geometrical disorders between Cu2+ and Ti4+ ions on the triangular lattice. Room-temperature photoelectron spectroscopy has been performed to determine the oxidation states of the respective ions present in the titled compound. Temperature-dependent magnetic molar susceptibility plots under zero field cooled and field cooled modes are superimposed on each other without any anomalies implying the absence of long-range magnetic ordering down to 2 K. Curie-Weiss fitting of high-temperature magnetization data nevertheless estimated a significantly high temperature of − 116 K which denotes antiferromagnetic interactions. Temperature-dependent heat capacity data measured in 0.100 K < T < 280 K in zero magnetic field and 0.1 K < T < 60 K for various fields complemented the magnetization studies. The magneto-thermal response of this material at low temperatures shows scaling behaviour consistent with random singlet formation on Cu2+ sites down to 100 mK. Absence of long-range magnetic order in the magnetic susceptibility or in the specific heat measurements of Y2CuTiO6 suggests the quantum spin liquid ground state.

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Acknowledgements

We would like to thank Dr. Soumee Chakraborty, MSG, for the Raman spectroscopy measurements and Er. M. P. Saravanan, UGC-DAE CSR, Indore, for the heat capacity measurements from 4 K down to 100 mK.

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Authors and Affiliations

  1. Materials Science Group, Indira Gandhi Centre for Atomic Research, A CI of Homi Bhabha National Institute, Kalpakkam 603102, Tamil Nadu, India

    Papiya Saha, R. Nithya, A. T. Sathyanarayana & K. Gururaj

  2. Low Temperature Laboratory, UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya Pradesh, India

    Vinay Kaushik, U. Deshpande & R. Venkatesh

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  1. Papiya Saha
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Correspondence to R. Nithya.

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Saha, P., Nithya, R., Sathyanarayana, A.T. et al. Experimental Evidences for Quantum Spin Liquid Ground State in Layered Hexagonal Y2CuTiO6. J Supercond Nov Magn 36, 1683–1691 (2023). https://doi.org/10.1007/s10948-023-06611-7

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