Critical exponents and intrinsic broadening of the field-induced transition in NiCl${}_2$$\cdot$4SC(NH${}_2$)${}_2$

Abstract

The field-induced ordering transition in the quantum spin system NiCl${}_2$$\cdot$4SC(NH${}_2$)${}_2$ is studied by means of neutron diffraction, AC magnetometry and relaxation calorimetry. The interpretation of the data is strongly influenced by a finite distribution of transition fields in the samples, which was present but disregarded in previous studies. Taking this effect into account, we find that the order-parameter critical exponent is inconsistent with the BEC universality class even at temperatures below 100 mK. All results are discussed in comparison with previous measurements and with recent similar studies of disordered Ni(Cl${}_{1-x}$Br${}_x$)${}_2$$\cdot$4SC(NH${}_2$)${}_2$.

References in corpus (19)

• Critical Phenomena and Renormalization-Group Theory
• Bose-Einstein Condensation in Magnetic Insulators
• Coupled Ladders in a Magnetic Field
• Bose-Einstein Condensation of S = 1 Ni spin degrees of freedom in NiCl2-4SC(NH2)2
• Observation of Field-Induced Transverse Néel Ordering in the Spin Gap System TlCuCl${}_3$
• Bose glass and Mott glass of quasiparticles in a doped quantum magnet
• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• A direct measurement of the Bose-Einstein Condensation universality class in NiCl${}_2$-4SC(NH${}_2$)${}_2$ at ultra-low temperatures
• Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2
• Dirty-boson physics with magnetic insulators
• Field-induced criticality in a gapped quantum magnet with bond disorder
• Low temperature thermodynamic properties near the field-induced quantum critical point in DTN
• Critical Exponents of the Superfluid-Bose Glass Transition in Three-Dimensions
• Spin Dynamics of $NiC{l}_2-4SC(N{H}_2{)}_2$ in the Field-Induced Ordered Phase
• U(1)-Symmetry breaking and violation of axial symmetry in TlCuCl3 and other insulating spin systems
• Universal phase diagram of disordered bosons from a doped quantum magnet
• Criticality in a disordered quantum antiferromagnet by neutron diffraction
• Magnon decay in gapped quantum spin systems
• Disorder instability of the magnon condensate in a frustrated spin ladder

Cited by in corpus (15)

• Temperature dependence of the NMR relaxation rate 1/T_1 for quantum spin chains
• Nuclear magnetic resonance study of the magnetic-field-induced ordered phase in the NiCl2-4SC(NH2)2 compound
• Dynamics of a bond-disordered $S=1$ quantum magnet near $z=1$ criticality
• Detection of a Disorder-Induced Bose-Einstein Condensate in a Quantum Spin Material at High Magnetic Fields
• Pre-saturation phase in the frustrated ferro-antiferromagnet Pb${}_2$VO(PO${}_4$)${}_2$
• Quantum criticality in a three dimensional spin system at zero field and pressure
• Competing Bose-Glass physics with disorder-induced Bose-Einstein condensation in the doped $S=1$ antiferromagnet Ni(Cl${}_{1-x}$Br${}_x$)${}_2$-4SC(NH${}_2$)${}_2$ at high magnetic fields
• Spin waves near the edge of halogen substitution induced magnetic order in Ni(Cl${}_{1-x}$Br${}_x$)${}_2$$\cdot$4SC(NH${}_2$)${}_2$
• Giant dielectric nonlinearities at a magnetic Bose-Einstein condensation
• Experimental Verification of the Universality of Magnetic-Field-Induced Bose-Einstein Condensation of Magnons
• Tuning the critical magnetic field of the triplon Bose-Einstein condensation in Ba${}_{3-x}$Sr${}_x$Cr${}_2$O${}_8$
• Microwave dynamics of pure and doped anisotropic S=1 chain antiferromagnet NiCl2-4SC(NH2)2
• Field-induced ordering in a random-bond quantum spin ladder compound with weak anisotropy
• Finite-temperature dynamics and the role of disorder in nearly critical Ni(Cl${}_{1-x}$Br${}_x$)${}_2$$\cdot$4SC(NH${}_2$)${}_2$
• Narrowly avoided spin-nematic phase in BaCdVO(PO${}_4$)${}_2$: NMR evidence