Abstract
Magnetic ground state of SrNi 2 V 2 O 8 has been investigated by many authors [Phys. Rev. Lett. 83 (1999) 632; Phys. Rev. B 62 (2000) 8921; and Phys. Rev. B 73 (2006) 012407], showing the different conclusions of which SrNi 2 V 2 O 8 falls into an ordered state or a spin-liquid state. In this study, we observed a quantum phase transition of a spin-liquid state to an ordered state in SrNi 2 V 2 O 8 by a minor substitution of Ca 2+ ions. Our experimental results provide concrete evidence that SrNi 2 V 2 O 8 is likely in a disordered ground state, which is close to the phase boundary between the spin-liquid and the Ising-like Néel ordered state on the Sakai–Takahashi phase diagram.
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