Specific heat of the quadratic antiferromagnetic CuCl2

Billerey, D.; Terrier, C.; Mainard, R.; Ciret, N.; Pointon, A. J.

doi:10.1016/0304-8853(82)90009-9

Cited by 6 publications

(3 citation statements)

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“…The magnetic contributions to the heat capacity of CuCl 2 has been evaluated before by Stout and Chisholm and subsequently by Billerey and coworkers. 3,18 Our measurements confirm (see Figure 11(a)) their peak-anomaly at ∼23 K indicating long-range AFM ordering.…”

Section: Density Functional Characterization Of the Spin Ex-change In...supporting

confidence: 72%

“…3,18 Stout and Chishom and Billerey et al used the heat capacities of MnCl 2 and MgCl 2 , respectively, in order to construct an estimate of the lattice heat capacity of CuCl 2 .We redetermined the heat capacities of MgCl 2 and found marked deviations of our data from those of Billerey. We considered also CdCl 2 as another possible system to estimate the phonon contributions to the heat capacity of CuCl2 and measured the heat capacity of CdCl 2 over a temperature range much wider than covered by the experiments of Itskevich et al(see Figure 12(a)).…”

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confidence: 74%

“…18 to be appropriate for MgCl 2 , MnCl 2 and CdCl 2 , respectively.A comparison of the heat capacities of CuCl 2 and MCl 2 (M=Mg, Mn, Cd) reveals significant short-range ordering magnetic contributions to the heat capacity of CuCl 2 up to ∼ 100 K, as already concluded by Stout et al and Billerey3,18 .In order to construct a lattice heat capacity reference for CuCl 2 from the heat capacities of MgCl 2 , MnCl 2 and CdCl 2 , we tried various combinations of the heat capacities of MgCl 2 , MnCl 2 and CdCl 2 with temperatures scaled by the factors given above and subtracted these from the total heat capacity of CuCl 2 . The resulting magnetic heat capacity of CuCl 2 , C mag /T was subsequently integrated and the total magnetic entropy was compared with Rln2, the entropy expected for a S=1/2 magnetic system as a crosscheck.Due to the very large deviations of the heat capacity of MgCl 2 from that of CuCl 2 , especially in the temperature regime below ∼ 50K where magnetic contributions are essential we discarded MgCl 2 and achieved an adequate lattice heat capacity reference by averaging for each temperature the heat capacities of MnCl 2 and CdCl 2 .The magnetic heat capacity of CuCl 2 obtained after subtracting the phonon contributions is shown in Figure20(b) and (c).…”

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Magnetic ordering in the frustrated Heisenberg chain system cupric chlorideCuCl2

et al. 2009

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We report a detailed examination the magnetic structure of anhydrous cupric chloride CuCl 2 carried out by powder neutron diffraction, magnetic susceptibility and specific heat measurements on polycrystalline and single crystal samples as well as an evaluation of the spin exchange interactions by first principles density functional theory (DFT) calculations. Anhydrous CuCl 2 shows one dimensional antiferromagnetic behavior and long range antiferromagnetic ordering below a Néel temperature of 23.9 K. Neutron powder and single crystal diffraction reveal that, below 23.9 K, CuCl 2 undergoes a phase transition into an incommensurate magnetic structure (propagation vector (1,0.2257,0.5) with a spin-spiral propagating along b and the moments confined in the bc crystallographic plane. Our DFT calculations show that the spin-spiral results from competing ferromagnetic nearest neighbor and antiferromagnetic next-nearest neighbor spin-exchange interaction along the spin chains. Implications for possible multiferroic behavior of CuCl 2 are discussed.

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Section: Density Functional Characterization Of the Spin Ex-change In...supporting

confidence: 72%

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