A direct measurement of the Bose-Einstein Condensation universality class in NiCl${}_2$-4SC(NH${}_2$)${}_2$ at ultra-low temperatures

Abstract

In this work, we demonstrate field-induced Bose-Einstein condensation (BEC) in the organic compound NiCl${}_2$-4SC(NH${}_2$)${}_2$ using AC susceptibility measurements down to 1 mK. The Ni $\textsl{S}$=1 spins exhibit 3D $XY$ antiferromagnetism between a lower critical field $H_{c1}\sim$ 2 T and a upper critical field $H_{c2}\sim$ 12 T. The results show a power-law temperature dependence of the phase transition line $H_{c1}(T)-H_{c1}(0)=a{T}^{\alpha }$ with $\alpha =$ 1.47$\pm$0.10 and $H_{c1}(0)=2.053$ T, consistent with the 3D Bose-Einstein Condensation universality class. An abnormal change was found in the phase boundary near $H_{c2}$ at approximately 150 mK.

4 pages, 4 figures

References in corpus (4)

• Bose-Einstein Condensation in Magnetic Insulators
• Dimensional reduction at a quantum critical point
• Bose-Einstein Condensation of Magnons in Cs2CuCl4
• Spin-resonance modes of the spin-gap magnet TlCuCl_3

Cited by in corpus (14)

• Low-Temperature Heat Transport in the Low-Dimensional Quantum Magnet NiCl_{2}-4SC(NH_{2})_{2}
• Characterizing the Haldane phase in quasi-one-dimensional spin-1 Heisenberg antiferromagnets
• Heat transport of quasi-one-dimensional Ising-like antiferromagnet BaCo_2V_2O_8 in the longitudinal and transverse fields
• Nuclear Magnetic Resonance in High Magnetic Field: Application to Condensed Matter Physics
• Nuclear magnetic resonance study of the magnetic-field-induced ordered phase in the NiCl2-4SC(NH2)2 compound
• Critical exponents and intrinsic broadening of the field-induced transition in NiCl${}_2$$\cdot$4SC(NH${}_2$)${}_2$
• Thermal conductivity of IPA-CuCl_3: Evidences of ballistic magnon transport and limited applicability of the Bose-Einstein condensation model
• Effective S=1/2 description of the S=1 chain with strong easy plane anisotropy
• Quantum criticality in a three dimensional spin system at zero field and pressure
• Field-induced spin level crossings within a quasi-XY antiferromagnetic state in Ba${}_2$FeSi${}_2$O${}_7$
• Antiferromagnet with two coupled antiferromagnetic sublattices in a magnetic field
• Interplay of quantum and classical fluctuations near quantum critical points
• Low-temperature heat transport of spin-gapped quantum magnets
• Bose-Einstein Condensation of Magnons in NiCl2-4SC(NH2)2