Thermodynamics of possible quantum spin liquid state in metal-oxalate framework [(C<sub>2</sub>H<sub>5</sub>)<sub>3</sub>NH]<sub>2</sub>Cu<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub>
POSTER
Abstract
[(C2H5)3NH]2Cu2(C2O4)3, is a three-dimensional metal-oxalate framework that forms a hyper-honeycomb lattice structure. In this lattice, Cu atoms form two distinct zigzag chains perpendicular to each other and offer alternating handedness in both left and right. As a result, this lattice contains two crystallographically distinct sub-lattices of Cu atoms [1, 2]. Jacko et al. suggest that one sub-lattice is strongly dimerized while the other forms isolated isotropic antiferromagnetic (AF) Heisenberg chains with Tomonaga-Luttinger spin liquid ground state [2]. Here we report thermodynamic properties of [(C2H5)3NH]2Cu2(C2O4)3 to characterize the spin liquid ground state. We find a sizable fermionic contribution in the specific heat at low temperatures, suggestive of the presence of a gapless ground state. We will also discuss the magnetic field dependence of the heat capacity.
[1] B.Zhang et al., J. Am. Chem. Soc., 140(1):122–125 (2018)
[2] Jacko et al., arXiv:1805.05495 (2018)
[1] B.Zhang et al., J. Am. Chem. Soc., 140(1):122–125 (2018)
[2] Jacko et al., arXiv:1805.05495 (2018)
Presenters
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Charuni Dissanayake
University of Central Florida
Authors
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Charuni Dissanayake
University of Central Florida
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K A M Hasan Siddiquee
University of Central Florida
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RIFFAT MUNIR
University of Central Florida
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Wesley Newsome
University of Central Florida
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Fernando Uribe-Romo
University of Central Florida
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Yasuyuki Nakajima
University of Central Florida