Coexistence of Antiferromagnetism and Superconductivity in CrRe Alloys

Nishihara, Y.; Yamaguchi, Yuji; Waki, Shinya; Kohara, T.

doi:10.1143/jpsj.52.2301

Cited by 18 publications

(6 citation statements)

References 6 publications

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“…4 In addition, rhenium-containing compounds have been used as catalysts in many types of organic reactions. [6][7][8] The nuclei of the two stable isotopes of rhenium ( 185 Re/ 187 Re) are NMR-active, are present in high natural abundance (37.398(16)% and 62.602 (16)% for 185 Re and 187 Re, respectively), 9 and are quadrupolar (I( 185/187 Re) = 5/2). In addition, they possess relatively high magnetogyric ratios (g( 185 Re) = 6.1057 Â 10 7 rad s À1 T À1 ; g( 187 Re) = 6.1682 Â 10 7 rad s À1 T À1 ).…”

Section: Introductionmentioning

confidence: 99%

“…10 Despite the potential wealth of diagnostic information that could be extracted using 185/187 Re SSNMR experiments, very few literature reports exist, and they are nearly exclusively restricted to compounds that exhibit very high symmetry, [11][12][13] or are from experiments carried out at liquid helium temperatures. [14][15][16] The paucity of 185/187 Re SSNMR studies may be attributed to the very large Q for both NMR-active nuclides (Q( 185 Re) = 2180 (20) mb; Q( 187 Re) = 2070(20) mb). 17 In fact, the line-width factor for 185 Re is the highest of the stable elements (1.5 Â 10 4 relative to 1 H).…”

Section: Introductionmentioning

confidence: 99%

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Definitive solid-state 185/187Re NMR spectral evidence for and analysis of the origin of high-order quadrupole-induced effects for I = 5/2

Widdifield

Bain

Bryce

2011

Phys. Chem. Chem. Phys.

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Rhenium-185/187 solid-state nuclear magnetic resonance (SSNMR) experiments using NaReO(4) and NH(4)ReO(4) powders provide unambiguous evidence for the existence of high-order quadrupole-induced effects (HOQIE) in SSNMR spectra. Fine structure, not predicted by second-order perturbation theory, has been observed in the (185/187)Re SSNMR spectrum of NaReO(4) at 11.75 T, where the ratio of the Larmor frequency (ν(0)) to the quadrupole frequency (ν(Q)) is ∼2.6. This is the first experimental observation that under static conditions, HOQIE can directly manifest in SSNMR powder patterns as additional fine structure. Using NMR simulation software which includes the quadrupole interaction (QI) exactly, extremely large (185/187)Re nuclear quadrupole coupling constants (C(Q)) are accurately determined. QI parameters are confirmed independently using solid-state (185/187)Re nuclear quadrupole resonance (NQR). We explain the spectral origin of the HOQIE and provide general guidelines that may be used to assess when HOQIE may impact the interpretation of the SSNMR powder pattern of any spin-5/2 nucleus in a large, axially symmetric electric field gradient (EFG). We also quantify the errors incurred when modeling SSNMR spectra for any spin-5/2 nucleus within an axial EFG using second-order perturbation theory. Lastly, we measure rhenium chemical shifts in the solid state for the first time.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Definitive solid-state 185/187Re NMR spectral evidence for and analysis of the origin of high-order quadrupole-induced effects for I = 5/2

Widdifield

Bain

Bryce

2011

Phys. Chem. Chem. Phys.

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“…The observation of the other extreme Tc<<TN was made by Nishihara et al [4][5][6] in bcc Crl-xRex alloys.…”

Section: Introductionmentioning

confidence: 80%

Electronic Structure of bcc Cr-Ru Alloys in the Region of Coexisting Antiferromagnetism and Superconductivity

Johnson

Pickett

1988

MRS Proc.

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The self-consistent Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) method is applied to determine the changes in the Cr electronic structure due to addition of up to 30% Ru. The results provide an interpretation of the coexisting antiferromagnetism and superconductivity in terms of specific pieces of Fermi surface.The strong nesting which occurs for the Cr Fermi surface survives the addition of at least 20% Ru, in agreement with the observed persistence of antiferromagnetism into this region.

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“…Some types of these pseudo-binary phases have been reported to show a spin canting [6,7]. It is also known [8,9] that in the C14 phase the thermal fluctuations of the 6h Fe moments give rise to a dynamical molecular field on 2a sites at a temperature close to T N , which causes strong spin fluctuations and an emerging magnetic moment at these sites. The easy magnetization axes may change their direction [10], yielding a wide range of possible angles θ between them and the EFG tensor principal axes.…”

Section: Introductionmentioning

confidence: 97%

Investigations of microscopic magnetic properties of the pseudo-binary system (Zr_1 xTi_x)Fe₂

Surowiec¹,

Wierteł²,

Beskrovnyĭ³

et al. 2003

J. Phys.: Condens. Matter

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The magnetic structure and hyperfine interactions in the polycrystalline pseudo-binary system (Zr1−xTix)Fe2 for and were studied using the techniques of neutron diffraction and the Mössbauer effect. The results of our measurements reveal the cubic C15 and the hexagonal C14 crystal structure for low and high Ti atom concentration x, respectively. For the ferrimagnetic region of the C15 structure the reduction from 1.58(5) to 1.30(6) μB of Fe magnetic moments with increasing x at room temperature was found. The presence of two hyperfine magnetic fields in the antiferromagnetic C14 phases suggests the existence of small magnetic moments on Fe atoms at 2a in addition to those present at the 6h sites. The magnetic structure refinement for the (Zr0.3Ti0.7)Fe2 alloy yielded magnetic moments perpendicular to the c axis of 0.19(10) μB at Fe 2a sites at 10 K. The results confirm the spin-canted antiferromagnetic structure with a canting angle of 8° at 10 K in the pseudo-binary phase.

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Coexistence of Antiferromagnetism and Superconductivity in CrRe Alloys

Cited by 18 publications

References 6 publications

Definitive solid-state 185/187Re NMR spectral evidence for and analysis of the origin of high-order quadrupole-induced effects for I = 5/2

Definitive solid-state 185/187Re NMR spectral evidence for and analysis of the origin of high-order quadrupole-induced effects for I = 5/2

Electronic Structure of bcc Cr-Ru Alloys in the Region of Coexisting Antiferromagnetism and Superconductivity

Investigations of microscopic magnetic properties of the pseudo-binary system (Zr_1 xTi_x)Fe₂

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Coexistence of Antiferromagnetism and Superconductivity in CrRe Alloys

Cited by 18 publications

References 6 publications

Definitive solid-state 185/187Re NMR spectral evidence for and analysis of the origin of high-order quadrupole-induced effects for I = 5/2

Definitive solid-state 185/187Re NMR spectral evidence for and analysis of the origin of high-order quadrupole-induced effects for I = 5/2

Electronic Structure of bcc Cr-Ru Alloys in the Region of Coexisting Antiferromagnetism and Superconductivity

Investigations of microscopic magnetic properties of the pseudo-binary system (Zr1 xTix)Fe2

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Investigations of microscopic magnetic properties of the pseudo-binary system (Zr_1 xTi_x)Fe₂