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Low-Temperature Thermoelectric Power Behavior of Nd1 − xGdxCo2: Insights from Impurity and Spin Wave Scattering

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Abstract

We present a detailed study of the thermoelectric power (S) of the Nd1 − xGdxCo2 system in the concentration range of 0.0 ≤  x ≤ 1.0. The evolution of negative to positive thermoelectric power with Gd doping is observed. We analyze the paramagnetic state thermoelectric power based on the density of states near the Fermi level and the broadening of the 3d band of the system. The complicated magnetic state thermoelectric power of the RCo2 system is not well understood, here we provide an explanation for the low-temperature magnetic state thermoelectric power using the Nordheim-Gorter rule with two different scattering mechanisms: impurity and spin wave. We observe a minimum for the Fermi energy as a function of Gd concentration, which is linked to the exchange integrals between the electrons and the compensation of moments for the system. Overall, our results shed light on the thermoelectric behavior of the Nd1 − xGdxCo2 system and provide insights into the physics of RCo2 compounds.

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Acknowledgments

The authors would like to express their gratitude to Dr. P. Chaddah and Prof. Ajay Gupta for their support and encouragement, as well as the staff of the low-temperature and cryogenics laboratory at UGC DAE CSR for their technical assistance. Additionally, we acknowledge the support of the LTHM Project by the DST, India, as well as the DST and CSIR for the fellowship granted to SP.

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Authors and Affiliations

  1. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, MP, 452017, India

    Swati Pandya, L. S. Sharath Chandra & V. Ganesan

  2. Department of Physics, Sardar Patel University, Vallabh Vidyanagar, Gujarat, 388120, India

    Swati Pandya

  3. Magnetic and Superconducting Materials Section, Raja Ramanna Center for Advanced Technology, Indore, MP, 452 013, India

    L. S. Sharath Chandra

  4. Medi-Caps University, A.B.Road, Pigdamber, Rau, Indore, MP, 453331, India

    V. Ganesan

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  1. Swati Pandya
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  2. L. S. Sharath Chandra
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  3. V. Ganesan
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Contributions

Dr Swati Pandya synthesized the samples, collected the data , analysed the data and prepared the main manuscript . Dr V Ganesan and Dr L S Sharath Chandra has contributed in data collection and concept.

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Correspondence to Swati Pandya.

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Pandya, S., Chandra, L.S.S. & Ganesan, V. Low-Temperature Thermoelectric Power Behavior of Nd1 − xGdxCo2: Insights from Impurity and Spin Wave Scattering. J Low Temp Phys 212, 69–78 (2023). https://doi.org/10.1007/s10909-023-02965-3

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  • DOI: https://doi.org/10.1007/s10909-023-02965-3

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