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The influence of electron-phonon coupling and spin fluctuations on the superconductivity of the Ti-V alloys

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Abstract

We report a study of the normal and superconducting state properties of the Ti x V1−x alloys for x = 0.4, 0.6, 0.7 and 0.8 with the help of dc magnetization, electrical resistivity and heat capacity measurements along with the electronic structure calculation. The superconducting transition temperature T c of these alloys is higher than that of elemental Ti and is also higher than elemental V for x ≤ 0.7. The roles of electron density of states, electron-phonon coupling and spin fluctuations in the normal and superconducting state properties of these alloys have been investigated in detail. The experimentally observed value of T c is found to be considerably lower than that estimated on the basis of electron density of states and electron-phonon coupling in the x = 0.4, 0.6 and 0.7 alloys. There is some evidence as well for the preformed Cooper pair in all these Ti-V alloys in the temperature regime well above T c . Similar to x = 0.6 [Md. Matin, L.S. Sharath Chandra, R.K. Meena, M.K. Chattopadhyay, A.K. Sinha, M.N. Singh, S.B. Roy, Physica B 436, 20 (2014)], the normal state properties of the x = 0.4 alloy showed the signature of the presence of spin fluctuations. The difference between the experimentally observed T c and that estimated by considering electron density of states and electron-phonon coupling in the x = 0.4, 0.6 and 0.7 alloys is attributed to the possible influence of these spin fluctuations. We show that the non-monotonous variation of T c as a function of x in the Ti x V1−x alloys is due to the combined effects of the electron-phonon coupling and the spin fluctuations.

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Authors and Affiliations

  1. Magnetic and Superconducting Materials Section, Raja Ramanna Center for Advanced Technology, Indore, 452 013, Madhya Pradesh, India

    Md. Matin, L. S. Sharath Chandra, Maulindu Kumar Chattopadhyay & Sindhunil Barman Roy

  2. School of Engineering, Indian Institute of Technology Mandi, Kamand, 175005, Himachal Pradesh, India

    Sudhir K. Pandey

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  1. Md. Matin
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Correspondence to L. S. Sharath Chandra.

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Matin, M., Sharath Chandra, L.S., Pandey, S.K. et al. The influence of electron-phonon coupling and spin fluctuations on the superconductivity of the Ti-V alloys. Eur. Phys. J. B 87, 131 (2014). https://doi.org/10.1140/epjb/e2014-50036-2

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