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We report magnetic susceptibility (chi) and heat capacity Cp measurementsalong with ab-initio electronic structure calculations on PbCuTe2O6, a compoundmade up of a three dimensional 3D network of corner-shared triangular units.The presence of antiferromagnetic interactions is inferred from a Curie-Weisstemperature (theta_CW) of about -22 K from the chi(T) data. The magnetic heatcapacity (Cm) data show a broad maximum at T^max ~ 1.15 K (i.e. T^max/theta_CW~ 0.05), which is analogous to the the observed broad maximum in the Cm/T dataof a hyper-Kagome system, Na4Ir3O8. In addition, Cm data exhibit a weak kink atT^* ~ 0.87 K. While the T^max is nearly unchanged, the T^* is systematicallysuppressed in an increasing magnetic field (H) up to 80 kOe. For H > 80 kOe,the Cm data at low temperatures exhibit a characteristic power-law (T^{\alpha})behavior with an exponent {\alpha} slightly less than 2. Hopping integralsobtained from the electronic structure calculations show the presence ofstrongly frustrated 3D spin interactions along with non-negligible unfrustratedcouplings. Our results suggest that PbCuTe2O6 is a candidate material forrealizing a 3D quantum spin liquid state at high magnetic fields.

Magnetic properties and heat capacity of the three-dimensional frustrated S=1/2 antiferromagnet PbCuTe2O6