Large anomalous Nernst effect and its bipolarity in the quaternary equiatomic Heusler alloys <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>CrRu</mml:mi><mml:mi>X</mml:mi><mml:mi>Ge</mml:mi></mml:mrow></mml:math> (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>X</mml:mi><mml:mo>=</mml:mo><mml:mi>Co</mml:mi></mml:mrow></mml:math> and Mn)
Amit Chanda, Jadupati Nag, Noah Schulz, Aftab Alam, К. Г. Суреш, Manh‐Huong Phan, H. Srikanth
Abstract
Anomalous Nernst effect (ANE)-based thermopiles can be constructed by combining materials with positive and negative ANE coefficients. While most of the magnetic materials show positive ANE, only a limited number of materials exhibit a negative ANE. Furthermore, the majority of the materials showing negative ANE have low Curie temperatures (TC). Here, the authors demonstrate that high-TC quaternary Heusler alloys with large spin polarizations can exhibit both positive and negative ANE coefficients, depending on their chemical compositions, and hence, can be potential candidates for developing efficient room-temperature ANE-based thermopiles.
Topics & Concepts
Nernst equationNernst effectQuaternaryCondensed matter physicsMaterials scienceThermodynamicsChemistryPhysicsGeologyPhysical chemistryElectrodePaleontologyHeusler alloys: electronic and magnetic propertiesAdvanced Thermoelectric Materials and DevicesMultiferroics and related materials