Terahertz studies of superconducting gaps in
Co-doped BaFe2As2 pnictide superconductors

• Authors: Paolo Dore , Boby Joseph , Stefano Lupi , Andrea Perucchi
• Languages of publication: EN

Abstracts

EN

In the present paper we report a summary of the infrared studies
on the multi-band Ba(Fe1-xCox)2As2 pnictide system, devoted
to the detection of superconducting gaps in the terahertz
region. Generally, results obtained in the superconducting
state indicate the presence of two gaps, but univocal results
have not been obtained so far. We show that all the literature
gap values of the Ba(Fe1-xCox)2As2 system, when put
together as a function of Tc, show a tendency to cluster along
two main curves, thus allowing to describe the seemingly contradictory
reports into a unified perspective. Below a temperature
around 20 K, the sizes of the two gaps as a function of
Tc seem to have a BCS-like linear behavior, but with different
slopes. In particular, the Δ/kBTc ratio is compatible with the
weak-coupling BCS prediction (1.76) for the large gap, while
it is close to 1 for the small gap. For Tc above 20 K, a clear
supra-linear behavior is observed for the large gap. Although
not so clear, such a tendency is also observable for the small
gap.

• Publisher: De Gruyter Open
• Journal: Novel Superconducting Materials
• Year: 2015
• Volume: 1
• Issue: 1

Dates

published

1 - 1 - 2015

online

12 - 11 - 2013

accepted

29 - 8 - 2013

received

7 - 6 - 2013

Contributors

author

Paolo Dore

• CNR-SPIN and Dipartimento di Fisica,
  Università di Roma Sapienza, P.le Aldo Moro 2, 00185 Roma, Italy

author

Boby Joseph

• Dipartimento di Fisica, Università di Roma Sapienza,
  P.le Aldo Moro 2, 00185 Roma, Italy

author

Stefano Lupi

• CNR-SPIN and Dipartimento di Fisica,
  Università di Roma Sapienza, P.le Aldo Moro 2, 00185 Roma, Italy

author

Andrea Perucchi

• Sincrotrone Trieste, S.C.p.A., Area Science Park,
  I-34012, Basovizza, Trieste, Italy

References

• [1] Y. Kamihara, T. Watanabe, M. Hirano and H. Hosono,J. Am. Chem. Soc. 130, 3296 (2008).
• [2] D.C. Johson Adv. Phys. (2010).
• [3] D.S. Isonov, J.T. Park, A. Charnuka, Y. Li, A.V. Boris,B. Keimer, and V. Hinkov, Phys. Rev. B 83, 214520(2011).
• [4] H. Suhl, B.T. Matthias and L.R. Walker, Phys. Rev.Lett. 3, 552 (1959).[Crossref]
• [5] P. Richard, T. Sato, K. Nakayama, T. Takahashi andH. Ding, Rep. Prog. Phys. 74 (2011).
• [6] D. Daghero, M. Tortello, G. A. Ummarino and R. S.Gonnelli, Rep. Prog. Phys. 74 (2011) 124509.
• [7] Fa Wang and Dung-Hai Lee, Science 332, 200(2011).
• [8] O.K. Andersen and L. Boeri, Ann. Phys. (Berlin) 523,8 (2011).
• [9] J.P. Hirschfeld, M.M. Korshunov, and I.I. Mazin, Rep.Prog. Phys. 74, 124508 (2011).[Crossref]
• [10] S. Raghu, X.-L. Qi, C.X. Liu, D.J. Scalapino, and S.C.Zhang, Phys. Rev. B 77, 220503(R) (2008); Q. Han,Y. Chen and Z. D. Wang, Europhys. Lett. 82, 37007(2008); A. Nicholson, W. Ge, X. Zhang, J. Riera, M.Daghofer, A. M. Oles, G. B. Martins, A. Moreo, andE. Dagotto, Phys. Rev. Lett. 106, 217002 (2011).
• [11] A. Charnukha, V. Dolgov, A. A. Golubov, Y. Matiks,D.L. Sun, C.T. Lin, B. Keimer, and A.V. Boris, Phys.Rev. B 84, 174511 (2011).[Crossref]
• [12] P. C. Canfield and S. L. Bud’ko, Annu. Rev. Condens.Matter Phys. 1,27 (2010); H. H. Wen and S. Li, Annu.Rev. Condens. Matter Phys. 2, 121 (2011).
• [13] K. Terashima, Y. Sekiba, J. H. Bowen, K. Nakayama,T. Kawahara, T. Sato, P. Richard, Y.-M. Xu, L. J. Li, G.H. Cao, Z.-A. Xu, H. Ding and T. Takahashi, PNAS106, 7330-7333 (2009).
• [14] Chang Liu, A. D. Palczewski, R. S. Dhaka, TakeshiKondo, R. M. Fernandes, E. D. Mun, H. Hodovanets,A. N. Thaler, J. Schmalian, S. L. Bud’ko, P. C. Canfield,and A. Kaminski, Phys. Rev. B 84, 020509 (2011).
• [15] M. L. Teague, G. K. Drayna, G. P. Lockhart, P. Cheng,B. Shen, H.-H. Wen, and N.-C. Yeh, Phys. Rev. Lett.106, 087004 (2011).
• [16] F. Hardy, P. Burger, T. Wolf, R.A. Fisher, P. Schweiss,P. Adelmann, R. Heid, R. Fromknecht, R. Eder, D.Ernst, H.v. Löhneysen, and C. Meingast, Europhys.Lett. 91, 47008 (2010).
• [17] M. Tortello, D. Daghero, G. A. Ummarino, V. A.Stepanov, J. Jiang, J. D. Weiss, E. E. Hellstrom, andR. S. Gonnelli, Phys. Rev. Lett. 105, 237002 (2010).[Crossref]
• [18] D. N. Basov, R. D. Averitt, D. van der Marel, M.Dressel and K. Haule, Rev. Mod. Phys. 85, 471(2011).[Crossref]
• [19] A. Perucchi, L. Baldassarre, P. Postorino, and S. Lupi,J. Phys.: Condens. Matter 21, 323202 (2009).[Crossref]
• [20] A. A. Schafgans, S. J. Moon, B. C. Pursley, A. D. La-Forge, M. M. Qazilbash, A. S. Sefat, D. Mandrus, K.Haule, G. Kotliar, and D. N. Basov, Phys. Rev. Lett.108, 147002 (2012).[Crossref]
• [21] A. Dusza, A. Lucarelli, A. Sanna, S. Massidda, J.-H.Chu, I.R. Fisher, and L. Degiorgi, New J. Phys. 14,023020 (2012).[Crossref]
• [22] S. J. Moon, A. A. Schafgans, S. Kasahara, T. Shibauchi,T. Terashima, Y. Matsuda, M. A. Tanatar, R. Prozorov,A. Thaler, P. C. Canfield, A. S. Sefat, D. Mandrus,and D. N. Basov, Phys. Rev. Lett. 109, 027006(2012).[Crossref]
• [23] M. Nakajima, S. Ishida, Y. Tomioka, K. Kihou, C.H.Lee, A. Iyo, T. Ito, T. Kakeshita, H. Eisaki, and S.Uchida, arXiv:1208.1581 (2012).
• [24] P. Marsik, K. W. Kim, A. Dubroka, M. Rossle, V. K.Malik, L. Schulz, C. N. Wang, Ch. Niedermayer, A. J.Drew, M. Willis, T. Wolf, and C. Bernhard, Phys. Rev.Lett. 105, 057001 (2010).
• [25] N. Barisic, D. Wu, and M. Dressel, L. J. Li, G. H. Cao,and Z. A. Xu, Phys. Rev. B 82, 054518 (2010).[Crossref]
• [26] A. Lucarelli, A. Dusza, F. Pfuner, P. Lerch, J.G. Analytis,J.-H. Chu, I.R. Fisher, and L. Degiorgi, New J.Phys. 12, 073036 (2010).[Crossref]
• [27] D. Wu, N. Barišic, P. Kallina, A. Faridian, A.Gorshunov, B. Drichko, L.J. Li, X. Lin, G.H. Cao, Z.A.Xu, N.L. Wang and M. Dressel, Phys. Rev. B 81,100512 (2010).[Crossref]
• [28] J.J. Tu, J. Li, W. Liu, A. Punnoose, Y. Gong, Y.H. Ren,L.J. Li, G.H. Cao, Z.A. Xu and C.C. Homes, Phys. Rev.B 82, 174509 (2010).[Crossref]
• [29] K.W. Kim, M. Rössle, A. Dubroka, V.K. Malik, T. Wolf,and C. Bernhard, Phys. Rev. B 81, 214508 (2010).[Crossref]
• [30] E. van Heumen, Y. Huang, D. de Jong, A.B. Kuzmenko,M.S. Golden, and D. van der Marel, Eur. Phys. Lett.90, 37005 (2010).
• [31] M. Nakajima, S. Ishida, K. Kikhou, Y. Tomioka, T.Ito, Y. Yoshida, C.H. Lee, H. Kito, A. Iyo, H. Eisaki, K.M. Kojima, and S. Uchida, Phys. Rev B 81, 104528(2010).[Crossref]
• [32] R.P.S.M. Lobo, Y.M. Dai, U. Nagel, T. Rõõm, J.P. Carbotte,T. Timusk, A. Forget, and D. Colson, Phys. Rev.B 82, 100506 (2010).[Crossref]
• [33] A. Yu, A. Aleshchenko, A. V. Muratov, V. M. Pudalov,E. S. Zhukova, B. P. Gorshunov, F. Kurth and K. Iida,JETP Lett., 94, 719 (2011).
• [34] E.G. Maksimov, A.E. Karakozov, B.P. Gorshunov, A.S.Prokhorov, A.A. Voronkov, E.S. Zhukova, V.S. Nozdrin,S.S. Zhukov, D. Wu, M. Dressel, S. Haindl, K. Iida,and B. Holzapfel, Phys. Rev. B 83, 140502 (2011);E.G. Maksimov, A.E. Karakozov, A.A. Voronkov, B.P.Gorshunov, S.S. Zhukov, E.S. Zhukova, V.S. Nozdrin,S. Haindl, B. Holzapfel, L. Schultz,D. Wu, M. Dressel,K. Iida, P. Kallinag, and F. Kurth, JETP Lett., 93, 736(2011).
• [35] B. Gorshunov, D. Wu, A.A. Voronkov, P. Kallina, K.Ilda, S. Haindl, F. Kurth, L. Schultz, B. Holzapfel,and M. Dressel, Phys. Rev. B 81, 060509 (2010).[Crossref]
• [36] T. Fischer, A.V. Pronin, J. Wosnitza, K. Ida, F. Kurth, S.Haindl, L. Schultz, B. Holzapfel, and E. Schachinger,Phys. Rev. B 82, 224507 (2010).[Crossref]
• [37] D. Nakamura, T. Akiike, H. Takahashi, F. Nabeshima,Y. Imai, A. Maeda, T. Katase, H. Hiramatsu , H. Hosono,S. Komiya, and I. Tsukada, Physica C 471, 634(2011).
• [38] R. Valdés Aguilar, L.S. Bilbro, S. Lee, C.W. Bark, J.Jiang, J.D. Weiss, E.E. Hellstrom, D.C. Larbalestier,C.B. Eom, and P. Armitage, Phys. Rev B 82, 180514(2010).[Crossref]
• [39] A. Perucchi, L. Baldassarre, S. Lupi, J.Y. Jiang, J.D.Weiss, E.E. Hellstron, S. Lee, C.W. Bark, C.B. Eom,M. Putti, I. Pallecchi, C. Marini and P. Dore, Eur.Phys. J. B 77, 25 (2010).
• [40] A. Perucchi, L. Baldassarre, S. Lupi, S. Lee, C.B. Eom,J. Jiang, J.D. Weiss, E.E. Hellstron, and P. Dore, Eur.Phys. J. B 86, 274 (2013).
• [41] L.H. Palmer and M. Tinkham, Phys. Rev. 165, 588(1968).
• [42] F. Wooten, in Optical Properties of Solids, AcademicPress, New York (1972).
• [43] M. Dressel and G. Grüner, in Electrodynamics ofSolids, Cambridge University Press (2002).
• [44] M. Tinkham, in Introduction to Superconductivity,McGraw-Hill (1996).
• [45] W. Zimmermann, E.H. Brandt, M. Bauer, E. Seiderand L. Genzel, Physica C 183, 99 (1991).
• [46] A. Perucchi, D. Nicoletti, M. Ortolani, C. Marini, R.Sopracase, S. Lupi, U. Schade, M. Putti, I. Pallecchi,C. Tarantini, M. Ferretti, C. Ferdeghini, M. Monni, F.Bernardini, S. Massidda, and P. Dore, Phys. Rev. B81, 092509 (2010).[Crossref]
• [47] M. Ortolani, D. Di Castro, P. Postorino, I. Pallecchi,M. Monni, M. Putti, P. Dore, Phys. Rev. B 71, 17250(R) (2005).
• [48] M. Ortolani, P. Dore, D. Di Castro, A. Perucchi, S.Lupi, V. Ferrando, M. Putti, I. Pallecchi, C. Ferdeghini,and X.X. Xi, Phys. Rev. B 77, 100507 (2008).[Crossref]
• [49] S. Lee, J. Jiang, C.W. Bark, J.D. Weiss, C. Tarantini,C.T. Nelson, H.W. Jang, C.M. Folkman, S.H. Baek, A.Polyanskii, D. Abraimov, A. Yamamoto, J.W. Park, X.Q.Pan, E.E. Hellstrom, D.C. Larbalestier, and C.B. Eom,Nature Materials 9, 397 (2010).[Crossref]
• [50] S. Lupi, A. Nucara, A. Perucchi, P. Calvani, M. Ortolani,L. Quaroni, and M. Kiskinova, J. Opt. Soc. Am.B 24, 959 (2007).[Crossref]
• [51] P. Berberich, M. Chiusuri, S. Cunsolo, P. Dore, H.Kinder, and C.P. Varsamis, Infrared Phys. 34, 269(1993).[Crossref]
• [52] P. Calvani, M. Capizzi, F. Donato, P. Dore, S. Lupi, P.Maselli, C.P. Varsamis, Physica C 181, 289 (1991).
• [53] P. Dore, G. P. Gallerano, A. Doria, E. Giovenale, R.Trippetti and V. Boffa, Nuovo Cimento D 16, 1803(1994).[Crossref]

Identifiers

DOI

10.2478/nsm-2013-0001