Hartree-Fock Diamagnetic Susceptibilities

Mendelsohn, Lawrence B.; Biggs, F.; Mann, Joseph B.

doi:10.1103/physreva.2.1130

Cited by 129 publications

(44 citation statements)

References 18 publications

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“…The diamagnetic core susceptibility is estimated as χ core = −2.08 × 10 −4 cm 3 /mol using the atomic diamagnetic susceptibilities. 42 From Eq. (19), the Pauli susceptibility is χ P = 5.33 × 10 −5 cm 3 /mol using D(E F ) = 1.65 states/eV f.u.…”

Section: B Magnetization and Magnetic Susceptibilitymentioning

confidence: 99%

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Crystal growth and physical properties of SrCu2As2, SrCu2Sb
Anand
¹
,
Perera
²
,
Pandey
³

et al. 2012
Phys. Rev. B

107

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We report the growth of single crystals of SrCu2As2, SrCu2Sb2, SrCu2(As0.84Sb0.16)2 and BaCu2Sb2 using the self-flux technique and their structural, magnetic, thermal and transport properties that were investigated by powder x-ray diffraction (XRD), magnetic susceptibility χ, specific heat Cp and electrical resistivity ρ measurements versus temperature T from 1.8 to 350 K. Rietveld refinements of XRD patterns for crushed crystals confirm that SrCu2As2 crystallizes in the ThCr2Si2-type body-centered tetragonal structure (space group I4/mmm) and SrCu2Sb2 crystallizes in the CaBe2Ge2-type primitive tetragonal structure (space group P 4/nmm). However, as reported previously, BaCu2Sb2 is found to have a large unit cell consisting of three blocks. Here a ThCr2Si2-type block is sandwiched between two CaBe2Ge2-type blocks along the c-axis with an overall symmetry of I4/mmm, as reported, but likely with a monoclinic distortion. The χ data of all these compounds are diamagnetic and reveal nearly T -independent anisotropic behavior. The χ of SrCu2As2 is found to be larger in the ab-plane than along the c-axis, as also previously reported for pure and doped BaFe2As2, whereas the χ values of SrCu2Sb2 and BaCu2Sb2 are larger along the c-axis. This difference in anisotropy appears to arise from the differences between the crystal structures. The finite values of the Sommerfeld linear specific heat coefficients γ and the T dependences of ρ reveal metallic character of all four compounds. The electronic and magnetic properties indicate that these compounds are sp metals with Cu in the nonmagnetic 3d 10 electronic configuration corresponding to the oxidation state Cu +1 , as previously predicted theoretically for SrCu2As2 by D. J. Singh [Phys. Rev. B 79, 153102 (2009)]. We present a brief review of theoretical and experimental work on the doping character of transition metals for Fe in BaFe2As2. The As-As covalent interlayer bond distances in the collapsed-tetragonal (Ca,Sr,Ba)Cu2As2 compounds are much shorter than the nonbonding As-As distances in BaFe2As2. Thus the electronic character of the Cu and the strength of the As-As interlayer bonding are both expected to drastically change between weakly Cu-substituted BaFe2As2 and pure BaCu2As2, perhaps via a first-order lattice instability such as a miscibility gap in the Ba(Fe1−xCux)2As2 system.

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Section: B Magnetization and Magnetic Susceptibilitymentioning

confidence: 99%

“…Since our compounds are closer to being covalent metals than ionic metals, we used atomic diamagnetic values 42 for χ core to obtain χ core = −1.75 × 10 −4 cm 3 /mol. The χ P can be estimated from D(E F ) using the relation…”

Section: B Magnetization and Magnetic Susceptibilitymentioning

confidence: 99%

Crystal growth and physical properties of SrCu2As2, SrCu2Sb
Anand
¹
,
Perera
²
,
Pandey
³

et al. 2012
Phys. Rev. B

107

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“…The diamagnetic susceptibilities of Co + , Dy 3+ , Er 3+ , and Gd 3+ ions have been estimated by Bain and Berry [8], and Mendelsohn et al [9], respectively. The diamagnetic susceptibility of Co ions in metals has been obtained by Banhart et al [10].…”

Section: Discussionmentioning

confidence: 99%

“…P eff is the effective number of Bohr magnetons. The symbols T and D are the paramagnetic Curie temperature and a residual susceptibility at infinite temperature, respectively [9]. In this work, the P eff values of RE ions in liquid RE-Co alloys were obtained from the As shown in Fig.…”

mentioning

confidence: 99%

Magnetic Properties of Liquid RE-Co (RE = Dy, Er) Alloys

et al. 2017

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The magnetic susceptibilities F of liquid Dy-Co and Er-Co alloys have a large and negative temperature coefficient, which suggests that the Dy, Er, and Co ions in their liquid alloys are in the magnetic state. However, the temperature dependence of F in both systems becomes weak near the content of 70 at% Co. It is interesting that the compositional dependence of F for liquid Dy-Co and Er-Co alloys has a minimum at content of 80 at% Co, respectively. On the Co-rich side, the magnetic susceptibility of liquid Dy-Co and Er-Co alloys obeyed the Curie-Weiss law with regard to their temperature dependence of F. On the rare earth-rich side, the magnetic susceptibilities of liquid Dy-Co and Er-Co alloys also exhibited Curie behavior with a reasonable value for the effective number of Bohr magnetons. The compositional dependence of F 4f for liquid Dy-Co and ErCo alloys was extracted by subtracting the corresponding data for liquid La-Co alloys from F for the liquid Dy-Co and Er-Co alloys, respectively.

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“…µ B /atom, χ Na dia = −3.8 × 10 −9 µ B /atom and χ Co dia = −5.5 × 10 −9 µ B /atom [18], the total diamagnetic susceptibility of Na…”

Section: 1mentioning

confidence: 99%

Possible spin triplet superconductivity in Na_xCoO₂·yH₂O —⁵⁹Co NMR studies

Kato¹,

Michioka²,

Waki³

et al. 2005

J. Phys.: Condens. Matter

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Abstract. We report 59 Co NMR studies on the magnetically oriented powder samples of Co-oxide superconductors Na x CoO 2 · yH 2 O with T c ∼ 4.7K. From twodimensional powder pattern in the NMR spectrum, the ab-plane Knight shift in the normal state was estimated by the magnetic field dependence of second-order quadrupole shifts at various temperatures. Below 50 K, the Knight shift shows a Curie-Weiss-like temperature dependence, similarly to the bulk magnetic susceptibility χ. From the analysis of so-called K-χ plot, the spin and the orbital components of K and the positive hyperfine coupling constant were estimated. The onset temperature of superconducting transition in the Knight shift does not change so much in an applied magnetic field up to 7 T, which is consistent with the reported high upper critical field H c2 . The Knight shift at 7 T shows an invariant behavior below T c . No coherence peak just below T c was observed in the temperature dependence of the nuclear spinlattice relaxation rate 1/T 1 in both cases of NMR and NQR. We conclude that the invariant behavior of the Knight shift below T c and unconventional behaviors of 1/T 1 possibly indicate the spin-triplet superconductivity with p-or f -wave symmetry.

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Hartree-Fock Diamagnetic Susceptibilities

Cited by 129 publications

References 18 publications

Crystal growth and physical properties of SrCu2As2, SrCu2Sb
Anand
¹
,
Perera
²
,
Pandey
³

et al. 2012
Phys. Rev. B

Crystal growth and physical properties of SrCu2As2, SrCu2Sb
Anand
¹
,
Perera
²
,
Pandey
³

et al. 2012
Phys. Rev. B

Magnetic Properties of Liquid RE-Co (RE = Dy, Er) Alloys

Possible spin triplet superconductivity in Na_xCoO₂·yH₂O —⁵⁹Co NMR studies

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Hartree-Fock Diamagnetic Susceptibilities

Cited by 129 publications

References 18 publications

Crystal growth and physical properties of SrCu2As2, SrCu2SbAnand1, Perera2, Pandey3 et al. 2012Phys. Rev. B

Crystal growth and physical properties of SrCu2As2, SrCu2SbAnand1, Perera2, Pandey3 et al. 2012Phys. Rev. B

Magnetic Properties of Liquid RE-Co (RE = Dy, Er) Alloys

Possible spin triplet superconductivity in NaxCoO2·yH2O —59Co NMR studies

Contact Info

Product

Resources

About

Crystal growth and physical properties of SrCu2As2, SrCu2Sb
Anand
¹
,
Perera
²
,
Pandey
³

et al. 2012
Phys. Rev. B

Crystal growth and physical properties of SrCu2As2, SrCu2Sb
Anand
¹
,
Perera
²
,
Pandey
³

et al. 2012
Phys. Rev. B

Possible spin triplet superconductivity in Na_xCoO₂·yH₂O —⁵⁹Co NMR studies