Large Thermopower Enhanced by Spin Entropy in Antiferromagnet EuMnSb_2

Zeliang Sun; Honghui Wang; Aifeng WangBin LeiWeizhuang ZhuoFanghang YuXiaoyuan ZhouJianjun YingZiji XiangTao WuXianhui Chen

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Large Thermopower Enhanced by Spin Entropy in Antiferromagnet EuMnSb_2

机译：Large Thermopower Enhanced by Spin Entropy in Antiferromagnet EuMnSb_2

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Thermoelectric materials can realize the mutual conversion between electricityand heat in a pollution-free process, and are thus exceptionallyimportant for applications like energy generation and thermoelectric cooling.Although thermoelectric properties are conventionally believed to be determinedby the charge and lattice degrees of freedom, the electron spin degreeof freedom can also make significant contribution with electron-electroncorrelation involved. Here, a large magneto-thermopower (MTEP) in theantiferromagnet EuMnSb2 is reported. At zero field, the thermopower firstincreases with decreasing temperature (T), exhibits a maximum at about70 K, and then decreases rapidly when cooled toward the antiferromagneticordering temperature (T_N) of the Eu spins. With magnetic fields applied, thethermopower shows weak field dependence below T_N, whereas at T > T_Nit is suppressed significantly, highlighting the contribution related to thespin degree of freedom. The negative MTEP above T_N is closely tracked bythe field-dependent spin entropy. These observations indicate that the spinentropy of the Eu moments can serve as the most possible source of thestrongly enhanced thermopower in EuMnSb2. These results pave new pathsto improve the thermoelectric performance by utilizing the spin degree offreedom and search for better thermoelectric materials.

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来源
《Advanced functional materials》 |2022年第33期|2202188.1-2202188.9|共9页
作者
Zeliang Sun; Honghui Wang; Aifeng WangBin LeiWeizhuang ZhuoFanghang YuXiaoyuan ZhouJianjun YingZiji XiangTao WuXianhui Chen;
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作者单位

Department of Physics, and Key Laboratory of Strongly-CoupleQuantum Matter PhysicsChinese Academy of SciencesUniversity of Science and Technology of ChinaHefei, Anhui 230026, China;

Center for Quantum Materials and Devices and Chongqing KeyLaboratory of Soft Condensed Matter Physics and Smart MaterialsCollege of PhysicsChongqing UniversityChongqing 401331, China;

Department of Physics, and Key Laboratory of Strongly-CoupleQuantum Matter PhysicsChinese Academy of SciencesUniversity of Science and Technology of ChinaHefei, Anhui 230026, China;

CAS Center for Excellence in Superconducting Electronics (CENSE)Shanghai 2CAS Center for Excellence in Superconducting Electronics (CENSE)Shanghai 200050, ChinaDepartment of Physics, and Key Laboratory of Strongly-CoupleQuantum Matter PhysicsChinese Academy of SciencesUniversity of Science and Technology of ChinaHefei, Anhui 230026, China,CAS Center for Excellence in Superconducting Electronics (CENSE)Shanghai 2;

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spin degree of freedom; spin entropy; thermopower;

Large Thermopower Enhanced by Spin Entropy in Antiferromagnet EuMnSb_2

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