Crystal Structure of Cu(NO3)2.2.5H2O.

Garaj, J.; Vannerberg, Nils-Gösta; Glehn, Marianne von; Tolboe, O.; Paasiv́irta, Jaakko

doi:10.3891/acta.chem.scand.22-1710

Cited by 20 publications

(14 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…People have successfully discovered and synthesized plenty of spin materials which are very well described by the low-dimensional Heisenberg-type spin models. The long list includes, to name only a few, the diamond spin chain material azurite5, the kagome spin liquid herbertsmithite6, and Cu(NO 3 ) 2 ·2.5 H 2 O (copper nitrate hemipentahydrate, hereinafter referred to as “CN”) as an alternating Heisenberg antiferromagnetic chain (AHAFC)7891011121314151617181920212223242526272829.…”

mentioning

confidence: 99%

Criticality-Enhanced Magnetocaloric Effect in Quantum Spin Chain Material Copper Nitrate

Xiang

Chen

et al. 2017

Sci Rep

View full text Add to dashboard Cite

In this work, a systematic study of Cu(NO3)2·2.5 H2O (copper nitrate hemipentahydrate, CN), an alternating Heisenberg antiferromagnetic chain model material, is performed with multi-technique approach including thermal tensor network (TTN) simulations, first-principles calculations, as well as magnetization measurements. Employing a cutting-edge TTN method developed in the present work, we verify the couplings J = 5.13 K, α = 0.23(1) and Landé factors g∥= 2.31, g⊥ = 2.14 in CN, with which the magnetothermal properties have been fitted strikingly well. Based on first-principles calculations, we reveal explicitly the spin chain scenario in CN by displaying the calculated electron density distributions, from which the distinct superexchange paths are visualized. On top of that, we investigated the magnetocaloric effect (MCE) in CN by calculating its isentropes and magnetic Grüneisen parameter. Prominent quantum criticality-enhanced MCE was uncovered near both critical fields of intermediate strengths as 2.87 and 4.08 T, respectively. We propose that CN is potentially a very promising quantum critical coolant.

show abstract

mentioning

confidence: 99%

Criticality-Enhanced Magnetocaloric Effect in Quantum Spin Chain Material Copper Nitrate

Xiang

Chen

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The phases and momenta are determined by the boundary conditions of the particles and their interaction energy. The standard method of solving for these boundary conditions [29,31] is to introduce the single site coefficients b 0 and b N and set ǫb 1 = γ k b 0 and ǫb N d −1 = γ k b N d and substitute into equation (14). The momentum p µ and phase φ µ solve for the constraints on b 0 and b N d when…”

Section: Magnon-pair-state Solutionsmentioning

confidence: 99%

“…where for θ = −i log( γ † k /γ k ) = kd/2 the timeindependent Schrödinger equation reduces to solving the real and symmetric system of equations (14) where γ k = γ † k γ k = αJ/2 · | cos(kd/2)| and the term exp(iθν) serves to transform to the center-of-momemtum (center R) frame where magnons are at r i = R − ν/2 and r j = R + ν/2 with total momentum K = k 1 + k 2 = kd.…”

Section: Two-magnon Statesmentioning

confidence: 99%

“…The structure of Cu(NO 3 ) 2 · 2.5H 2 O was investigated by Garaj [14] and Morosin [15], and was shown to have a monoclinic crystal structure with space group I12/c1 [16] and the lattice parameters and crystallographic copper positions given in Table II. The deuterated form Cu(NO 3 ) 2 ·2.5D 2 O we studied has low temperature (T = 3 K) lattice parameters a= 16.1, b= 4.9, c = 15.8Å and β = 92.9 • [10].…”

Section: Theorymentioning

confidence: 99%

See 1 more Smart Citation

Neutron scattering study of two-magnon states in the quantum magnet copper nitrate

et al. 2003

View full text Add to dashboard Cite

We report measurements of the two-magnon states in a dimerized antiferromagnetic chain material, copper nitrate (Cu(NO3)2 · 2.5D2O). Using inelastic neutron scattering we have measured the one and two magnon excitation spectra in a large single crystal. The data are in excellent agreement with a perturbative expansion of the alternating Heisenberg Hamiltonian from the strongly dimerized limit. The expansion predicts a two-magnon bound state for q ∼ (2n + 1)πd which is consistent with the neutron scattering data.

show abstract

“…• . 54,65,66 We find the lowtemperature, T ≤ 4 K, lattice constants to be a = 16.12Å, b = 4.90Å, c = 15.84Å, and β = 92.90…”

mentioning

confidence: 97%

Magnons and continua in a magnetized and dimerized spin-12chain

et al. 2014

View full text Add to dashboard Cite

We examine the magnetic field dependent excitations of the dimerized spin-1/2 chain, copper nitrate, with antiferromagnetic intra-dimer exchange J1 = 0.44(1) meV and exchange alternation α = J2/J1 = 0.26(2). Magnetic excitations in three distinct regimes of magnetization are probed through inelastic neutron scattering at low temperatures. At low and high fields there are three and two long-lived magnon-like modes, respectively. The number of modes and the anti-phase relationship between the wave-vector dependent energy and intensity of magnon scattering reflect the distinct ground states: A singlet ground state at low fields µ0H < µ0Hc1 = 2.8 T and an Sz = 1/2 product state at high fields µ0H > µ0Hc2 = 4.2 T. In the intermediate field regime, a continuum of scattering forhω ≈ J1 is indicative of a strongly correlated gapless quantum state without coherent magnons.

show abstract

Crystal Structure of Cu(NO3)2.2.5H2O.

Cited by 20 publications

References 0 publications

Criticality-Enhanced Magnetocaloric Effect in Quantum Spin Chain Material Copper Nitrate

Criticality-Enhanced Magnetocaloric Effect in Quantum Spin Chain Material Copper Nitrate

Neutron scattering study of two-magnon states in the quantum magnet copper nitrate

Magnons and continua in a magnetized and dimerized spin-12chain

Contact Info

Product

Resources

About