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Superconductivity in Mg-Doped Layered Intermetallic Compound NbB2 |
LIU Guang-Tong1,2;JIN Hao2;LI Zheng1;GENG Hong-Xia1;CHE Guang-Can1;JIN Duo1;SUN Lian-Feng2 XIE Si-Shen1;LUO Jian-Lin1 |
| 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1000802National Center for Nanoscience and Technology, Beijing 100080 |
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| Cite this article: |
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LIU Guang-Tong, JIN Hao, LI Zheng et al 2008 Chin. Phys. Lett. 25 687-690 |
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Abstract We have performed low temperature resistivity ρ(T) and specific heat C(T) measurements on a superconducting polycrystalline Nb0.75Mg0.25B2 sample.
The results indicate that the superconducting transition temperature is ~4.6K. The zero temperature upper critical field determined from the resistivity and specific heat is 3123Oe. The electronic coefficient of specific heat γn=4.51mJmol-1K2 and the Debye temperature θD=419K are obtained by fitting the zero-field specific heat data in the normal state. At low temperatures, the electronic specific heat in the superconducting state follows CesθnTc=2.84exp(1.21Tc/T). This indicates that the superconducting pairing in
Nb0.75Mg0.25B2 has s-wave symmetry.
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| Keywords:
74.25.Bt
74.25.Op
74.70.Ad
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Received: 09 February 2007
Published: 30 January 2008
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| PACS: |
74.25.Bt
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(Thermodynamic properties)
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74.25.Op
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(Mixed states, critical fields, and surface sheaths)
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74.70.Ad
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(Metals; alloys and binary compounds)
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[1] Nagamatsu J, Nakagawa N, Muranaka T, Zenitani Y andAkimitsu J 2001 Nature 410 63
[2]Yamamoto A, Takao C, Masui T, Izumi M and Tajima S 2002 Physica C 383 197
[3] R. Kiessling 1951 J. Electrochem. Soc. 98 166
[4] Brewer L, Sawyer D L, Templeton D H and Dauben C H 1951 J. Am. Ceram. Soc. 34 173
[5] Juretschke H J and Steinitz R 1958 J. Phys. Chem.Solids 4 118
[6] Gasparov V A, Sidorov N S, Zver'kova I L and Kulakov M P2001 JEPT Lett. 73 532
[7] Cooper A S, Corenzwit E, Longinotti L D, Matthias B T andZachariasen W H 1970 Proc. Nat. Acad. Sci. 67 313
[8] Kaczorowski D, Zaleski A J, Zogal O J and Klamut J 2001 cond-mat/0103571
[9] Leyarovska L and Leyarovski E 1979 Less Com. Met. 67 249
[10] Kotegawa H, Ishida K, Kitaoka Y, Muranaka T, Nakagawa N,Takagiwa H and Akimitsu J 2002 Physica C 378-381 25
[11] Schirber J E, Overmyer D L, Morosin B, Venturini E L,Baughman R, Emin D, Klesnar H and Aselage T 1992 Phys. Rev. B 45 10787
[12] Hulm J K and Mathias B T 1951 Phys. Rev. B 82273
[13] Zeigler W A and Young R 1953 Phys. Rev. B 94115
[14] Xiao R J, Li K Q, Yang H X, Che G C, Zhang H R, Ma C,Zhao Z X and Li J Q 2006 Phys. Rev. B 73 224516
[15] Escamilla R, Lovera O, Akachi T, Dur{\'{an A, FalconiR, Morales F and Escudero R 2004 J. Phys.: Condens. Matter 16 5979
[16] An J M and Pickett W E 2001 Phys. Rev. Lett. 86 4366
[17] Kortus J, Mazin I I, Belashchenko K D, Antropov V P andBoyer L L 2001 Phys. Rev. Lett. 86 4656
[18] Kong Y, Dolgov O V, Jepsen O and Andersen O K 2001 Phys. Rev. B 64 020501
[19] Bohnen K -P, Heid R and Renker B 2001 Phys. Rev.Lett. 86 5771
[20] Yildirim T, G\"{ulseren O, Lynn J W, Brown C M, Udovic TJ, Huang Q, Rogado N, Regan K A, Hayward M A, Slusky J S, He T, HaasM K, Khalifah P, Inumaru K and Cava R J 2001 Phys. Rev. Lett. 87 037001
[21] Choi H J, Roundy D, Sun H, Cohen M L and Louie S G 2002 Phys. Rev. B 66 020513
[22] Shukla A, Calandra M, Astuto M d', Lazzeri M, Mauri F,Bellin C, Krisch M, Karpinski J, Kazakov S M, Jun J, Daghero D andParlinski K 2003 Phys. Rev. Lett. 90 095506
[23] Singh P P 2003 Phys. Rev. B 67 132511
[24] Kang W N, Kim K H P, Kim H J, Choi E M, Park M S, Kim MS, Du Z L, Jung C U, Kim K H, Lee S I and Mun M O 2002 J.Korean Phys. Soc. 40 949
[25] Jin R, Paranthaman M, Zhai H Y, Christen H M, Christen DK and Mandrus D 2001 Phys. Rev. B 64 220506
[26] Moler K A, Baar D J, Urbach J S, Liang R, Hardy W N andKapitulnik A 1994 Phys. Rev. Lett. 73 2744
[27] Revaz B, Genoud J -Y, Junod A, Neumaier K, Erb A and EWalker 1998 Phys. Rev. Lett. 80 3364
[28] Yang H D, Lin J -Y, Li H H, Hsu F H, Liu C J, Li S-C, YuR-C and Jin C-Q 2001 Phys. Rev. Lett. 87 167003
[29] Liu G T, Luo J L, Li Z, Guo Y Q, Wang N L, Jin D andXiang T 2006 Phys. Rev. B 74 012504
[30] Luo J L, Loram J W, Cooper J R and Tallon J L 2000 Physica B 284 1045
[31] Ketterson J B and Song S N 1999 Superconductivity(Cambridge: Cambridge University Press) part I p 215
[32] Geng H X, Che G C, Huang W W, Jia S L, Chen H and Zhao ZX 2007 Supercond. Sci. Technol. 20 452
[33] Tinkham M 1996 Introduction to Superconductivity2nd edn (New York: McGraw-Hill) chap 4 p 118
[34] Werthamer N R, Helfand E and Hohenberg P C 1966 Phys. Rev. 147 295
[35] Finnemore D K, Ostenson J E, Bud'ko S L, Lapertot G andP. C. Canfield 2001 Phys. Rev. Lett. 86 2420
[36] Chou F C, Cho J H, Lee P A, Abel E T, Matan K and Lee Y S2004 Phys. Rev. Lett. 92 157004
[37] Morosan E, Zandbergen H W, Dennis B S, Bos J W G, OnoseY, Klimczuk T, Ramirez A P, Ong N P and Cava R J 2006 Nat.Phys. 2 544
[38] Wang Y, Plackowski T and Junod A 2001 Physica C 355 179
[39] McMillan W L 1968 Phys. Rev. 167 331
[40] Joseph P J T and Singh P P 2003 Physica C 391125
[41] Shein I R, Medvedeva N I and Ivanovski A L 2003 Phys. Solid State 45 1617
[42] Lin J Y, Ho P L, Huang H L, Lin P H, Zhang Y L, Yu R C,Jin C Q and Yang H D 2001 Phys. Rev. B 67 052501
[43]Caroli C, Gennes P G de and Matricon J 1964 Phys.Lett. 9 307 |
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