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• W2971483198 endingPage "107401" @default.
• W2971483198 startingPage "107401" @default.
• W2971483198 abstract "We report robust superconducting state and gap symmetry of Nb 5 Ir 3 O via electrical transport and specific heat measurements. The analysis of specific heat manifests that Nb 5 Ir 3 O is a strongly coupled superconductor with <?CDATA ${rm{Delta }}C/{gamma }_{{rm{n}}}{T}_{{rm{c}}}sim 1.91$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi mathvariant=normal>Δ</mml:mi> <mml:mi>C</mml:mi> <mml:mrow> <mml:mo stretchy=false>/</mml:mo> </mml:mrow> <mml:msub> <mml:mrow> <mml:mi>γ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>n</mml:mi> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>c</mml:mi> </mml:mrow> </mml:msub> <mml:mo>∼</mml:mo> <mml:mn>1.91</mml:mn> </mml:math> and double s-wave superconducting gaps of <?CDATA $2{{rm{Delta }}}_{{rm{L}}}(0)/{k}_{{rm{B}}}{T}_{{rm{c}}}sim 6.56$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>2</mml:mn> <mml:msub> <mml:mrow> <mml:mi mathvariant=normal>Δ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>L</mml:mi> </mml:mrow> </mml:msub> <mml:mo stretchy=false>(</mml:mo> <mml:mn>0</mml:mn> <mml:mo stretchy=false>)</mml:mo> <mml:mrow> <mml:mo stretchy=false>/</mml:mo> </mml:mrow> <mml:msub> <mml:mrow> <mml:mi>k</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>B</mml:mi> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>c</mml:mi> </mml:mrow> </mml:msub> <mml:mo>∼</mml:mo> <mml:mn>6.56</mml:mn> </mml:math> and <?CDATA $2{{rm{Delta }}}_{{rm{S}}}(0)/{k}_{{rm{B}}}{T}_{{rm{c}}}sim 2.36$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>2</mml:mn> <mml:msub> <mml:mrow> <mml:mi mathvariant=normal>Δ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>S</mml:mi> </mml:mrow> </mml:msub> <mml:mo stretchy=false>(</mml:mo> <mml:mn>0</mml:mn> <mml:mo stretchy=false>)</mml:mo> <mml:mrow> <mml:mo stretchy=false>/</mml:mo> </mml:mrow> <mml:msub> <mml:mrow> <mml:mi>k</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>B</mml:mi> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>c</mml:mi> </mml:mrow> </mml:msub> <mml:mo>∼</mml:mo> <mml:mn>2.36</mml:mn> </mml:math> accounting for 90% and 10%, respectively. The <?CDATA $({C}_{{rm{p}}}-{gamma }_{{rm{n}}}T)/{T}^{3}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mo stretchy=false>(</mml:mo> <mml:msub> <mml:mrow> <mml:mi>C</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>p</mml:mi> </mml:mrow> </mml:msub> <mml:mo>−</mml:mo> <mml:msub> <mml:mrow> <mml:mi>γ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>n</mml:mi> </mml:mrow> </mml:msub> <mml:mi>T</mml:mi> <mml:mo stretchy=false>)</mml:mo> <mml:mrow> <mml:mo stretchy=false>/</mml:mo> </mml:mrow> <mml:msup> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msup> </mml:math> vs. T plot shows a broad peak at ∼23 K, indicating phonon softening and the appearance of low-lying phonon mode associated with the interstitial oxygen. This behavior explains the monotonic increase of T c in <?CDATA ${mathrm{Nb}}_{5}{mathrm{Ir}}_{3}{{rm{O}}}_{(1-delta )}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow> <mml:mi>Nb</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>5</mml:mn> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi>Ir</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mi>δ</mml:mi> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:msub> </mml:math> by strengthening the electron–phonon coupling and enlarging the density of states at Fermi level. The Hall coefficient is temperature independent below 200 K, and changes its sign from positive to negative above 250 K, suggesting that carrier is across the hole- to electron-dominant regions and the multi-band electronic structures. On warming, the resistivity shows a gradual crossover from <?CDATA ${T}^{2}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msup> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> </mml:math> - to <?CDATA ${T}^{3}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msup> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msup> </mml:math> -dependence at a critical temperature <?CDATA ${T}^{* }$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msup> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>*</mml:mo> </mml:mrow> </mml:msup> </mml:math> , and a broad peak at a temperature T p . The reduced T c under pressure is linearly correlated with lattice parameters c / a ratio and T p , suggesting the important phonon contributions in Nb 5 Ir 3 O as a phonon-medicated superconductor. Possible physical mechanisms are proposed." @default.
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• W2971483198 date "2019-10-01" @default.
• W2971483198 modified "2023-10-14" @default.
• W2971483198 title "Robust two-gap strong coupling superconductivity associated with low-lying phonon modes in pressurized Nb₅Ir₃O superconductors*" @default.
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• W2971483198 doi "https://doi.org/10.1088/1674-1056/ab4047" @default.
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