Thermopower as sensitive probe of electronic nematicity in iron pnictides

Abstract

We study the in-plane anisotropy of the thermoelectric power and electrical resistivity on detwinned single crystals of isovalent substituted EuFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$. Compared to the resistivity anisotropy the thermopower anisotropy is more pronounced and clearly visible already at temperatures much above the structural and magnetic phase transitions. Most remarkably, the thermopower anisotropy changes sign below the structural transition. This is associated with the interplay of two contributions due to anisotropic scattering and orbital polarization, which dominate at high- and low-temperatures, respectively.

8 pages, including supplemental Material

References in corpus (14)

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• Symmetry-breaking lattice distortion in Sr_3Ru_2O_7
• Unique phase diagram with narrow superconducting dome in EuFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ due to Eu${}^{2+}$ local magnetic moments

Cited by in corpus (14)

• Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Persistent detwinning of iron pnictides by small magnetic fields
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$: Evidence for a sharp enhancement of spin fluctuations by nematic order
• Spin-orbital interplay and topology in the nematic phase of iron pnictides
• Local nematic susceptibility in stressed BaFe${}_2$As${}_2$ from NMR electric field gradient measurements
• Electronic Phase Diagram of SrFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$: Effect of Structural Dimensionality
• Orbital Nematic Order and Interplay with Magnetism in the Two-Orbital Hubbard Model
• Possible coexistence of double-Q magnetic order and chequerboard charge order in the re-entrant tetragonal phase of Ba0.76K0.24Fe2As2
• The interactions between antiferromagnetism, tetrahedral sites and electron-phonon coupling in FeSe1-xTex and FeSe/SrTiO3
• Apparatus Design for Measuring of the Strain Dependence of the Seebeck Coefficient of Single Crystals
• Ubiquity of rotational symmetry breaking in superconducting films, from Fe(Te,Se)/Bi${}_2$Te${}_3$ to Nb, and the effect of measurement geometry
• Measurements of nematic susceptibility with phase sensitive nuclear magnetic resonance in pulsed strain fields
• The thermoelectric conversion efficiency problem: Insights from the electron gas thermodynamics close to a phase transition