Publisher's Note: Quantum spin chain as a potential realization of the Nersesyan-Tsvelik model [Phys. Rev. B90, 060409(R) (2014)]

Magnetic Hamiltonian and phase diagram of the quantum spin liquidCa10Cr7O28

“…Spinons are well-understood in onedimensional (1D) antiferromagnets [8] where they have a spin quantum number of S = 1 /2 which makes them individually inaccessible to condensed matter probes such as neutron or Raman scattering whose selection rules ensure that the spin quantum number changes by an integer amount. As a result spinons have to be created in multiple pairs and are observed as a continuum of excitations in complete contrast to the single spin-wave excitations observed in conventional magnets by inelastic neutron scattering as a sharp mode with a well-defined trajectory throughout energy and wavevector space [9][10][11].…”

“…Spinons are well-understood in onedimensional (1D) antiferromagnets [8] where they have a spin quantum number of S = 1 /2 which makes them individually inaccessible to condensed matter probes such as neutron or Raman scattering whose selection rules ensure that the spin quantum number changes by an integer amount. As a result spinons have to be created in multiple pairs and are observed as a continuum of excitations in complete contrast to the single spin-wave excitations observed in conventional magnets by inelastic neutron scattering as a sharp mode with a well-defined trajectory throughout energy and wavevector space [9][10][11].The main ingredient for spin liquid behavior is com-2 petition which leads to many quasi-degenerate ground states so the system is unable to choose a single configuration but oscillates between the different possibilities.Competition can be achieved when the interactions between the magnetic ions are incompatible with each other and/or with anisotropies present in the system. While these ideas are being explored theoretically using model Hamiltonians, real spin liquid materials are very rare because even small additional terms in the Hamiltonian lift the degeneracy allowing the system to revert to static long-range magnetic order and spin-wave excitations.…”

A combination of organic and inorganic cations in the synthesis of transition metal nitrates: preparation and characterization of canted rectangular Ising antiferromagnet (PyH)CsCo2(NO3)6

“…It was found, however, that this system establishes a long-range magnetic order at ultralow temperatures. 7 The study of a two-leg ladder compound, Rb 3 Ni 2 (NO 3 ) 7 , down to helium temperatures revealed no signs of magnetic order, suggesting a valence bond crystal ground state. 8 As for the possible new TM nitrates with an extended magnetic subsystem, compounds of the composition ATM (NO 3 ) 3 (A = monovalent cation) are promising.…”