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<p>We investigated the transport properties of Ba-doped cobalt oxypnictides, (Sr<InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(_{1-x}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow> <mn>1</mn> <mo>-</mo> <mi>x</mi> </mrow> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>Ba<InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(_x\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mi>x</mi> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>)<InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(_2\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>2</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>ScCoPO<InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(_3\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>3</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation> (<i>x</i> = 0.05 and 0.10), synthesized via a solid-state reaction. The objective was to clarify whether lattice expansion alone induces the anomalous Seebeck coefficient (<i>S</i>) sign inversion previously observed in Fe-doped Sr<InlineEquation ID="IEq13"> <EquationSource Format="TEX">\(_2\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>2</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>ScCoPO<InlineEquation ID="IEq14"> <EquationSource Format="TEX">\(_3\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>3</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>. XRD analysis showed that Ba-substitution in the Sr<InlineEquation ID="IEq15"> <EquationSource Format="TEX">\(_2\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>2</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>ScO<InlineEquation ID="IEq16"> <EquationSource Format="TEX">\(_3\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>3</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation> blocking layer successfully expanded the lattice constants.</p><p>The resistivity measurements revealed metallic behavior for all samples. While the absolute value of <i>S</i> (|<i>S</i>|) was larger than that of the undoped sample (<i>x</i> = 0), it showed no significant dependence on the Ba concentration <i>x</i>. Furthermore, the sign of <i>S</i> remained negative without any inversion down to 20 K. These findings indicate that structural expansion does not significantly alter the multi-band electronic structure near the Fermi level. We conclude that direct electronic modification of the conduction layer is the primary driver for the sign inversion.</p>

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Substitution Effect of Ba on Transport Properties of the Layered Cobalt Oxypnictide (Sr\(_{1-x}\)Ba\(_x\))\(_2\)ScCoPO\(_3\) with CoP Layers

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Satoshi Okada,
  • Naoki Ohkubo,
  • Shuichi Ban

摘要

We investigated the transport properties of Ba-doped cobalt oxypnictides, (Sr \(_{1-x}\) 1 - x Ba \(_x\) x ) \(_2\) 2 ScCoPO \(_3\) 3 (x = 0.05 and 0.10), synthesized via a solid-state reaction. The objective was to clarify whether lattice expansion alone induces the anomalous Seebeck coefficient (S) sign inversion previously observed in Fe-doped Sr \(_2\) 2 ScCoPO \(_3\) 3 . XRD analysis showed that Ba-substitution in the Sr \(_2\) 2 ScO \(_3\) 3 blocking layer successfully expanded the lattice constants.

The resistivity measurements revealed metallic behavior for all samples. While the absolute value of S (|S|) was larger than that of the undoped sample (x = 0), it showed no significant dependence on the Ba concentration x. Furthermore, the sign of S remained negative without any inversion down to 20 K. These findings indicate that structural expansion does not significantly alter the multi-band electronic structure near the Fermi level. We conclude that direct electronic modification of the conduction layer is the primary driver for the sign inversion.