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Rule, K. C.; Reehuis, M.; Gibson, M. C. R.; Ouladdiaf, B.; Gutmann, Matthias J.; Hoffmann, J.-U.; Gerischer, S.; Tennant, A.; Süllow, S.; Lang, Michael

doi:10.1103/physrevb.83.104401

Cited by 39 publications

(39 citation statements)

References 36 publications

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“…de Another intriguing property of azurite, not accounted for so far from theory, refers to the strong magnetoelastic couplings in this compound. These couplings manifest themselves, e.g., in a pronounced structural distortion accompanying the magnetic transition at T N , as revealed by thermal expansion [18,19] and neutron scattering experiments [19,20]. Here we present a study of these magnetoelastic couplings of azurite by means of temperature-dependent measurements of the elastic constant and uniaxial thermal expansion coefficients.…”

Section: Introductionmentioning

confidence: 88%

Magnetoelastic couplings in the distorted diamond-chain compound azurite

et al. 2014

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We present results of ultrasonic measurements on a single crystal of the distorted diamond-chain compound azurite Cu 3 (CO 3 ) 2 (OH) 2 . Pronounced elastic anomalies are observed in the temperature dependence of the longitudinal elastic mode c 22 which can be assigned to the relevant magnetic interactions in the system and their couplings to the lattice degrees of freedom. From a semiquantitative analysis of the magnetic contribution to c 22 the magnetoelastic coupling G = ∂J 2 /∂ b can be estimated, where J 2 is the intradimer coupling constant and b the strain along the intrachain b axis. We find an exceptionally large coupling constant of |G| ∼ 3650 K highlighting an extraordinarily strong sensitivity of J 2 against changes of the b-axis lattice parameter. These results are complemented by measurements of the hydrostatic pressure dependence of J 2 by means of thermal expansion and magnetic susceptibility measurements performed both at ambient and finite hydrostatic pressure. We propose that a structural peculiarity of this compound, in which Cu 2 O 6 dimer units are incorporated in an unusually stretched manner, is responsible for the anomalously large magnetoelastic coupling.

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Section: Introductionmentioning

confidence: 88%

Magnetoelastic couplings in the distorted diamond-chain compound azurite

et al. 2014

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“…It is evidenced that the J 2 is the strongest interaction, leading to a separation of Cu 2+ spins into dimers and monomers [1,2,3,4,5,6,7,8,9,10,11]. The dimerization occurs at about 20 K [1].…”

Section: Introductionmentioning

confidence: 96%

“…A natural mineral azurite, Cu 3 (CO 3 ) 2 (OH) 2 , has received extensive interests because of its particular magnetic structure [1,2,3,4,5,6,7,8,9,10,11]. Cu 3 (CO 3 ) 2 (OH) 2 crystallizes in a monoclinic structure (space group P 2 1 /c) with the room-temperature lattice parameters a = 5.01Å, b = 5.85Å, c = 10.35Å, and a monoclinic angle β = 92.4…”

Section: Introductionmentioning

confidence: 99%

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Thermal conductivity of the diamond-chain compound Cu₃(CO₃)₂(OH)₂

Song

Zhao

et al. 2016

J. Phys.: Condens. Matter

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Thermal conductivity (κ) of a distorted spin diamond-chain system, Cu3(CO3)2(OH)2, is studied at low temperatures down to 0.3 K and in magnetic fields up to 14 T. In zero field, the curve with heat current along the chain direction has very small magnitudes and shows a pronounced three-peak structure. The magnetic fields along and perpendicular to the chains change the κ strongly in a way having good correspondence to the changes of magnetic specific heat in fields. The data analysis based on the Debye model for phononic thermal conductivity indicates that the heat transport is due to phonons and the three-peak structure is caused by two resonant scattering processes by the magnetic excitations. In particular, the spin excitations of the chain subsystem are strongly scattering phonons rather than transporting heat.

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“…These results give the appearance of a quadratic phase diagram, which is different from other low-dimensional spin chains where the application of a field tends to suppress the ordering temperature. [56,57] The (white) area is the paramagnetic regime, the (red) area is the low field long-range order phase and the (blue) area is the high field phase whilst the yellow area is the cross-over from the low field to high field phases.…”

Section: Phase Diagrammentioning

confidence: 99%

Strongly correlated one-dimensional magnetic behavior ofNiTa2O6

Law

Koo²,

Whangbo³

et al. 2014

Phys. Rev. B

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The magnetic properties of NiTa2O6 were investigated by magnetic susceptibility, specific heat, electron paramagnetic resonance, neutron powder diffraction and pulse field magnetization measurements. Accompanying ab initio DFT calculations of the spin-exchange constants complemented and supported our experimental findings that NiTa2O6 must be described as a quasi-1D Heisenberg S = 1 spin chain system with a nearest-neighbor only anti-ferromagnetic spin-exchange interaction of 18.92(2) K. Inter-chain coupling is by about two orders of magnitude smaller. Electron paramagnetic resonance measurements on Mg1−xNixTa2O6 (x ≈ 1%) polycrystalline samples enabled us to estimate the single-ion zero-field splitting of the S = 1 states which amounts to less than 4% of the nearest-neighbor spin-exchange interaction. At 0 T NiTa2O6 undergoes long-range antiferromagnetic ordering at 10.3(1) K evidenced by a λ-type anomaly in the specific heat capacity. On application of a magnetic field the specific heat anomaly is smeared out. We confirmed the magnetic structure by neutron powder diffraction measurements and at 2.00(1) K refined a magnetic moment of 1.93(5) µB per Ni 2+ ion. Additionally, we followed the magnetic order parameter as a function of temperature. Lastly we found saturation of the magnetic moment at 55.5(5) T with a g-factor of 2.14(1), with an additional high field phase above 12.8(1) T. The onset of the new high field phase is not greatly effected by temperature, but rather smears out as one approaches the long-range ordering temperature.

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Magnetic and crystal structure of azurite Cu3(CO3)<

Cited by 39 publications

References 36 publications

Magnetoelastic couplings in the distorted diamond-chain compound azurite

Magnetoelastic couplings in the distorted diamond-chain compound azurite

Thermal conductivity of the diamond-chain compound Cu₃(CO₃)₂(OH)₂

Strongly correlated one-dimensional magnetic behavior ofNiTa2O6

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Magnetic and crystal structure of azurite Cu3(CO3)<

Cited by 39 publications

References 36 publications

Magnetoelastic couplings in the distorted diamond-chain compound azurite

Magnetoelastic couplings in the distorted diamond-chain compound azurite

Thermal conductivity of the diamond-chain compound Cu3(CO3)2(OH)2

Strongly correlated one-dimensional magnetic behavior ofNiTa2O6

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Product

Resources

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Thermal conductivity of the diamond-chain compound Cu₃(CO₃)₂(OH)₂