Knight shift in the superconducting state of several vanadium based A-15 compounds

Eight ternary tetrelides TPtX (T = Ti, Zr, Hf; X = Si, Ge, Sn) were synthesized from the elements by arc-melting and subsequent annealing. TiPtSi, ZrPtSi, ZrPtGe, HfPtSi and HfPtGe crystallize with the orthorhombic TiNiSi type structure, in the space group Pnma. The structures of HfPtSi (a = 654.44(9), b = 387.97(6), c = 750.0(1) pm, wR2 = 0.0592, 411 F(2) values, 20 variables) and HfPtGe (a = 660.36(7), b = 395.18(4), c = 763.05(8) pm, wR2 = 0.0495, 430 F(2) values, 20 variables) were refined from single crystal X-ray diffractometer data. TiPtSn adopts the cubic MgAgAs type. TiPtGe is dimorphic with a TiNiSi type high-temperature modification which transforms to cubic LT-TiPtGe (MgAgAs type). All phases were investigated by high resolution (29)Si, (47)Ti, (49)Ti and (195)Pt solid state MAS NMR spectroscopy. In the cubic compounds, the (47/49)Ti NMR signals are easily detected owing to the absence of quadrupolar broadening effects. The (195)Pt resonances of the orthorhombic compounds are characterized by strongly negative isotropic Knight shifts and large Knight shift anisotropies, whereas positive isotropic Knight shifts and no anisotropies are observed for the cubic compounds. These results indicate that the phase transition in TiPtGe is associated with dramatic changes in the electronic properties. Within each group of isotypic compounds the isotropic (29)Si, (47/49)Ti and (195)Pt Knight shifts show systematic dependences on the transition metal or tetrel atomic number, suggesting that the numerical values are influenced by the electronegativities of the metallic (or metalloid) neighbours.

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²⁹Si,⁴⁷Ti,⁴⁹Ti and¹⁹⁵Pt solid state MAS NMR spectroscopic investigations of ternary silicides TPtSi, germanides TPtGe (T = Ti, Zr, Hf) and stannide TiPtSn

Benndorf

Eckert

Pöttgen

2016

Dalton Trans.

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NMR study of the electronic structure in titanium niobium dihydride

Nowak¹,

Żogał²,

Minier³

1979

J. Phys. C: Solid State Phys.

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⁵¹V and¹H nuclear magnetic resonance in vanadium dihydride

Nowak¹,

Żogał²,

Drulis³

1982

J. Phys. C: Solid State Phys.

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Knight shift in the superconducting state of several vanadium based A-15 compounds

Cited by 3 publications

References 23 publications

²⁹Si,⁴⁷Ti,⁴⁹Ti and¹⁹⁵Pt solid state MAS NMR spectroscopic investigations of ternary silicides TPtSi, germanides TPtGe (T = Ti, Zr, Hf) and stannide TiPtSn

²⁹Si,⁴⁷Ti,⁴⁹Ti and¹⁹⁵Pt solid state MAS NMR spectroscopic investigations of ternary silicides TPtSi, germanides TPtGe (T = Ti, Zr, Hf) and stannide TiPtSn

NMR study of the electronic structure in titanium niobium dihydride

⁵¹V and¹H nuclear magnetic resonance in vanadium dihydride

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Knight shift in the superconducting state of several vanadium based A-15 compounds

Cited by 3 publications

References 23 publications

29Si,47Ti,49Ti and195Pt solid state MAS NMR spectroscopic investigations of ternary silicides TPtSi, germanides TPtGe (T = Ti, Zr, Hf) and stannide TiPtSn

29Si,47Ti,49Ti and195Pt solid state MAS NMR spectroscopic investigations of ternary silicides TPtSi, germanides TPtGe (T = Ti, Zr, Hf) and stannide TiPtSn

NMR study of the electronic structure in titanium niobium dihydride

51V and1H nuclear magnetic resonance in vanadium dihydride

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²⁹Si,⁴⁷Ti,⁴⁹Ti and¹⁹⁵Pt solid state MAS NMR spectroscopic investigations of ternary silicides TPtSi, germanides TPtGe (T = Ti, Zr, Hf) and stannide TiPtSn

²⁹Si,⁴⁷Ti,⁴⁹Ti and¹⁹⁵Pt solid state MAS NMR spectroscopic investigations of ternary silicides TPtSi, germanides TPtGe (T = Ti, Zr, Hf) and stannide TiPtSn

⁵¹V and¹H nuclear magnetic resonance in vanadium dihydride