The specific heat of high purity gadolinium between 1.5 and 14K

Wells, P.N.T.; Lanchester, P.C.; Jones, D W; Jordan, R.G.

doi:10.1088/0305-4608/4/10/019

Cited by 53 publications

(8 citation statements)

References 14 publications

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“…The inferred experimental specific heat value is 1.57 eV −1 . 28 Our calculated PBE spin moment is 7.62 µ B in agreement with experiment and prior studies, while the TB-mBJ value is 6.65 µ B . Therefore, it may be concluded that the TB-mBJ functional seriously degrades agreement with experiment for ferromagnetic Gd.…”

Section: Ferromagnetic Gdsupporting

confidence: 90%

Electronic structure calculations with the Tran-Blaha modified Becke-Johnson density functional

Singh

2010

Phys. Rev. B

319

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We report a series of calculations testing the predictions of the Tran-Blaha functional for the electronic structure and magnetic properties of condensed systems. We find a general improvement in the properties of semiconducting and insulating systems, relative to calculations with standard generalized gradient approximations, although this is not always by the same mechanism as other approaches such as the quasiparticle GW method. In ZnO the valence bands are narrowed and the band gap is increased to a value in much better agreement with experiment. The Zn d states do not move to higher binding energy as they do in LDA+U calculations. The functional is effective for systems with hydride anions, where correcting self-interaction errors in the 1s state is important. Similarly, it correctly opens semiconducting gaps in the alkaline earth hexaborides. It correctly stabilizes an antiferromagnetic insulating ground state for the undoped cuprate parent CaCuO2, but seriously degrades the agreement with experiment for ferromagnetic Gd relative to the standard local spin density approximation and generalized gradient approximations. This is due to positioning of the minority spin 4f states at too low an energy. Conversly, the position of the La 4f conduction bands of La2O3 is in reasonable accord with experiment as it is with standard functionals. The functional narrows the Fe d bands of the parent compound LaFeAsO of the iron high temperature superconductors, while maintaining the high Fe spectral weight near the Fermi energy.PACS numbers:

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Section: Ferromagnetic Gdsupporting

confidence: 90%

Electronic structure calculations with the Tran-Blaha modified Becke-Johnson density functional

Singh

2010

Phys. Rev. B

319

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“…1 ≈ λ in the majority-spin channel. This value may be compared with a value of 1.2 (bulk, spin averaged), extracted from the measured specific heat [20] (using the band-theory density of states and assuming only electron-phonon renormalization) and a theoretical value of 0.4 (also bulk and spin-averaged) obtained in a spinpolarized calculation of the electron-phonon coupling constant [21].…”

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confidence: 99%

Spin-resolved photoemission study of photohole lifetimes in ferromagnetic gadolinium

et al. 2002

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High resolution spin-resolved photoemission is used to probe the properties of a Gd(0001) surface state. The state shows both a spin-mixing behavior reflecting the exchange of magnons with the local moments and a reduction of the exchange splitting with increasing temperature. The surface state polarization at low T suggests that the surface layer has an enhanced T c of 365K or greater. Measurements of the photoemission linewidths show that at low temperatures, the lifetime of a majority spin photohole is predominantly limited by electron-phonon scattering and that of a minority spin photohole by electron-magnon scattering. Since similar behavior may be expected for bulk states close to the Fermi level, the transport properties of this material will also be determined by different decay mechanisms in the two channels.

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“…17,18 At low temperatures, C p increases monotonously on heating. This indicates that the measured polycrystalline Gd sample is free of Gd 2 O 3 which would result in a peaklike anomaly of C p at T % 4 K. 19 Such a conclusion is supported by the XRD data of the sheets cold rolled from the same ingot (Fig. 2).…”

Section: Shown Inmentioning

confidence: 53%

Effect of severe plastic deformation on the specific heat and magnetic properties of cold rolled Gd sheets

Taskaev

Skokov

Khovaylo

et al. 2015

Journal of Applied Physics

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Crystal structure, magnetic properties, and the magnetocaloric effect of Gd5Rh4 and GdRh J. Appl. Phys. 113, 17A904 (2013); 10.1063/1.4793775 Microstructure and magnetic variations induced by plastic deformation in Ni 72 Cr 16 Fe 8We report on specific heat and magnetic properties of thin Gd sheets obtained by means of a cold rolling technique. At temperatures well below Curie temperature T C , the cold rolling has a minor impact on the specific heat C p . However, a well defined k-type anomaly of C p seen in the vicinity of T C in a polycrystalline Gd sample is markedly suppressed in the severely deformed samples. Depression of the k peak is due to a large decrease of magnetization that presumably originates in a local magnetic anisotropy induced by the severe plastic deformation. Results of calculation of magnetocaloric effect from the C p and magnetization data indicate that the magnetocaloric effect gradually decreases as the degree of plastic deformation increases. This trend is further confirmed by the direct measurements of the adiabatic temperature change DT ad . V C 2015 AIP Publishing LLC.

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The specific heat of high purity gadolinium between 1.5 and 14K

Cited by 53 publications

References 14 publications

Electronic structure calculations with the Tran-Blaha modified Becke-Johnson density functional

Electronic structure calculations with the Tran-Blaha modified Becke-Johnson density functional

Spin-resolved photoemission study of photohole lifetimes in ferromagnetic gadolinium

Effect of severe plastic deformation on the specific heat and magnetic properties of cold rolled Gd sheets

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