Abstract
The effect of substitutional disorder on the superconducting properties of YNi2B2C was studied by partially replacing yttrium and nickel by Lu and Pt, respectively. For the two series of (Y, Lu)Ni2B2C and Y(Ni, Pt)2B2C compounds, the upper critical field H c2(T) and the specific heat c p(T, H) in the superconducting mixed state have been investigated. Disorder is found to reduce several relevant quantities such as T c, the upper critical field H c2(0) at T=0 and a characteristic positive curvature of H c2(T) observed for these compounds near T c. The H c2(T) data point to the clean limit for (Y, Lu) substitutions and to a transition to the quasi-dirty limit for (Ni, Pt) substitutions. The electronic specific heat contribution γ(H) exhibits significant deviations from the usual linear γ(H) law. These deviations reduce with growing substitutional disorder but remain even in the quasidirty limit which is reached in the Y(Ni1−x , Pt x )2B2C samples for x=0.1.
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R Nagarajan, Chandan Mazumdar, Zakir Hossain, S K Dhar, K V Gopalakrishnan, L C Gupta, C Godart, P D Padalia and R Vijayaraghavan, Phys. Rev. Lett. 72, 274 (1994)
R J Cava, H Takagi, H W Zandbergen, J J Krajewski, W F Peck Jr, T Siegrist, B Batlogg, R B van Dover, R J Felder, K Mizuhashi, J O Lee, H Eisaki and S Uchida, Nature 367, 252 (1994)
S L Drechsler, H Rosner, S V Shulga, H Eschrig, J Freudenberger, G Fuchs, K Nenkov, D Lipp, K H Mueller, A Gladun, A Kreyssig, K Koepernik, P Gegenwart and T Cichorek, Physica C341–348, Part II, 749 (2000)
S V Shulga, S L Drechsler, G Fuchs, K H Müller, K Winzer, M Heinecke and K Krug, Phys. Rev. Lett. 80, 1730 (1998)
J Freudenberger, S L Drechsler, G Fuchs, A Kreyssig, K Nenkov, S V Shulga, K H Müller and L Schultz, Physica C306, 1 (1998)
M Nohara, M Isshiki, F Sakai and H Takagi, J. Phys. Soc. Jpn. 68, 1078 (1999)
M Nohara, M Isshiki, H Takagi and R J Cava, J. Phys. Soc. Jpn. 66, 1888 (1997)
G Fuchs, K H Müller, J Freudenberger, K Nenkov, S L Drechsler, H Rosner, S V Shulga, A Gladun, D Lipp, T Cichorek and P Gegenwart, in Rare earth transition metal borocarbides (nitrides): Superconducting, magnetic and normal state properties, edited by K H Müller and V N Narozhnyi (Kluwer Acad. Publ., Dordrecht, 2001) p. 243
H Rosner, S L Drechsler, S V Shulga, K Koepernik, I Opahle and H Eschrig, Advances in Solid State Physics, edited by B Kramer (Verweg & Sohn, Braunschweig 2000) vol. 40, p. 714
D A Wright, J P Emerson, B F Woodfield, J E Gordon, R A Fisher and N E Phillips, Phys. Rev. Lett. 82, 1550 (1999)
A P Ramirez, N Stücheli and E Bucher, Phys. Rev. Lett. 74, 1218 (1995)
M Hedo, J. Phys. Soc. Jpn. 67, 272 (1998)
J E Sonier, M F Hundley, J D Thompson and J W Brill, Phys. Rev. Lett. 82, 4914 (1998)
G F Wang and K Maki, Phys. Rev. B58, 6493 (1998)
K Izawa, A Shibata, Yuji Matsuda, Y Kato, H Takeya, K Hirata, C J van der Beek and M Konczykowski, Phys. Rev. Lett. 86, 1327 (2001)
E Boaknin, R W Hill, C Proust, C Lupien, L Tailefer and P C Canfield, Phys. Rev. Lett. 87, 237001 (2001)
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Fuchs, G., Müller, KH., Freudenberger, J. et al. Influence of disorder on superconductivity in non-magnetic rare-earth nickel borocarbides. Pramana - J Phys 58, 791–797 (2002). https://doi.org/10.1007/s12043-002-0173-6
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DOI: https://doi.org/10.1007/s12043-002-0173-6