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Drastic Suppression of CDW (Charge Density Wave) by Pd Addition in TiSe2

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Abstract

TiSe2 is a known topological semi-metal (TSM) having both the semi-metallic and topological characters simultaneously along with the charge density wave (CDW) at below 200 K. In the current short article, we study the impact of Pd addition on CDW character of TiSe2 and the possible induction of superconductivity at low temperatures. Bulk samples of TiSe2 and Pd0.1TiSe2 are synthesized by solid-state reaction route, which are further characterized by powder X-ray diffraction (PXRD) and field emission scanning electron microscopy (FESEM), respectively, for their structural and micro-structural details. The vibrational modes of both samples are being analyzed by Raman spectroscopy, showing the occurrence of both A1g and Eg modes. CDW of pure TiSe2 seen at around 200 K in electrical transport measurements in terms of sharp semi-metallic to metallic transition peak with hysteresis in cooling/warming cycles is not seen in Pd0.1TiSe2 and rather a near metallic transport is seen down to 2 K. Although superconductivity is not seen down to 2 K, the CDW transition is seemingly completely suppressed in Pd0.1TiSe2. It is clear that Pd addition in TiSe2 suppresses CDW drastically. Trials are underway to induce superconductivity in Pd-added TiSe2. Density functional theory (DFT) calculations show primary evidence of suppression of CDW by addition of Pd in TiSe2 due to an increase in the density of states.

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Acknowledgements

The authors would like to thank the Director of the National Physical Laboratory (NPL), India, for providing the facilities and for his keen interest in research. The authors would like to thank Dr. J. S. Tawale and Ms. Shaweta for FESEM and Raman spectroscopy measurements respectively and Mr. Manish Mani Sharma for help in resistivity measurements and critical reading of the short MS. Abhilasha Saini, Kapil Kumar, and N. K. Karn would like to thank AcSIR-NPL for Ph.D. registration.

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Authors and Affiliations

  1. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India

    Abhilasha Saini, N. K. Karn, Kapil Kumar, R. P. Aloysius & V. P. S. Awana

  2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India

    Abhilasha Saini, N. K. Karn, Kapil Kumar, R. P. Aloysius & V. P. S. Awana

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  1. Abhilasha Saini
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  2. N. K. Karn
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  3. Kapil Kumar
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  4. R. P. Aloysius
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  5. V. P. S. Awana
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Correspondence to V. P. S. Awana.

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Saini, A., Karn, N.K., Kumar, K. et al. Drastic Suppression of CDW (Charge Density Wave) by Pd Addition in TiSe2. J Supercond Nov Magn 36, 3–9 (2023). https://doi.org/10.1007/s10948-022-06453-9

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  • DOI: https://doi.org/10.1007/s10948-022-06453-9

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