[en] Using two experimental techniques, we studied single crystals of the 122-FeAs family with almost the same critical temperature, Tc. We investigated the temperature dependence of the lower critical field Hc1(T) of a Ca0.32Na0.68Fe2As2 (Tc ≈ 34 K) single crystal under static magnetic fields H parallel to the c axis. The temperature dependence of the London penetration depth can be described equally well either by a single anisotropic s-wave-like gap or by a two-gap model, while a d-wave approach cannot be used to fit the London penetration depth data. Intrinsic multiple Andreev reflection effect spectroscopy was used to detect bulk gap values in single crystals of the intimate compound Ba0.65K0.35Fe2As2, with the same Tc. We estimated the range of the large gap value L = 6–8 meV (depending on small variation of Tc) and its a k space anisotropy of about 30%, and the small gap Delta ≈ 1.7 ± 0.3 meV. This clearly indicates that the gap structure of our investigated systems more likely corresponds to a nodeless s-wave two gaps.
Disciplines :
Physics
Author, co-author :
Abdel-Hafiez, M.; Université de Liège - ULiège
Pereira, P.J.; Katholieke Universiteit Leuven - KUL
Kuzmichev, S.A.; Lomonosov Moscow State University - MSU
Kuzmicheva, T.E.; Lebedev Physical Institute
Pudalov, V.M.; Lebedev Physical Institute
Harnagea, L.; Leibniz Institute for Solid State and Materials Research, IFW-Dresden, D-01171 Dresden, Germany
Kordyuk, A.A.; Institute of Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Moshchalkov, V.V.; Katholieke Universiteit Leuven - KUL
Shen, B.; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Wen, Hai-Hu; National Laboratory for Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
Vasiliev, A.N.; Lomonosov Moscow State University - MSU
Chen, Xiao-Jia; Center for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, China
H. J. Choi, D. Roundy, H. Sun, Nature 418, 758 (2002). NATUAS 0028-0836 10.1038/nature00898
V. A. Moskalenko, Fiz. Met. Metalloved. 8, 503 (1959).
H. Suhl, B. T. Matthias, and L. R. Walker, Phys. Rev. Lett. 3, 552 (1959). PRLTAO 0031-9007 10.1103/PhysRevLett.3.552
D. V. Evtushinsky, V. B. Zabolotnyy, L. Harnagea, A. N. Yaresko, S. Thirupathaiah, A. A. Kordyuk, J. Maletz, S. Aswartham, S. Wurmehl, E. Rienks, R. Follath, B. Büchner, and S. V. Borisenko, Phys. Rev. B 87, 094501 (2013). PRBMDO 1098-0121 10.1103/PhysRevB.87.094501
S. Johnston, M. Abdel-Hafiez, L. Harnagea, V. Grinenko, D. Bombor, Y. Krupskaya, C. Hess, S. Wurmehl, A. U. B. Wolter, B. Büchner, H. Rosner, and S.-L. Drechsler, Phys. Rev. B 89, 134507 (2014). PRBMDO 1098-0121 10.1103/PhysRevB.89.134507
D. J. Singh, Phys. Rev. B 78, 094511 (2008). PRBMDO 1098-0121 10.1103/PhysRevB.78.094511
D. Kasinathan, A. Ormeci, K. Koch, New J. Phys. 11, 025023 (2009). NJOPFM 1367-2630 10.1088/1367-2630/11/2/025023
A. K. Pramanik, M. Abdel-Hafiez, S. Aswartham, A. U. B. Wolter, S. Wurmehl, V. Kataev, and B. Büchner, Phys. Rev. B 84, 064525 (2011). 1098-0121 10.1103/PhysRevB.84.064525
P. Popovich, A. V. Boris, O. V. Dolgov, A. A. Golubov, D. L. Sun, C. T. Lin, R. K. Kremer, and B. Keimer, Phys. Rev. Lett. 105, 027003 (2010). PRLTAO 0031-9007 10.1103/PhysRevLett.105.027003
F. Hardy, R. Eder, M. Jackson, J. Phys. Soc. Jpn. 83, 014711 (2014). JUPSAU 0031-9015 10.7566/JPSJ.83.014711
H. Padamsee, J. E. Neighbor, and C. A. Shifman, J. Low Temp. Phys. 12, 387 (1973). JLTPAC 0022-2291 10.1007/BF00654872
S. A. Kuzmichev, T. E. Shanygina, S. N. Tchesnokov, and S. I. Krasnosvobodtsev, Solid State Commun. 152, 119 (2012). SSCOA4 0038-1098 10.1016/j.ssc.2011.10.028
S. A. Kuzmichev, T. E. Kuzmicheva, and S. N. Tchesnokov, JETP Lett. 99, 295 (2014). JTPLA2 0021-3640 10.1134/S0021364014050129
S. A. Kuzmichev, T. E. Kuzmicheva, A. I. Boltalin, and I. V. Morozov, JETP Lett. 98, 722 (2014). JTPLA2 0021-3640 10.1134/S0021364013240120
T. E. Kuzmicheva, S. A. Kuzmichev, and N. D. Zhigadlo, JETP Lett. 99, 136 (2014). JTPLA2 0021-3640 10.1134/S0021364014030102
T. E. Shanygina, S. A. Kuzmichev, M. G. Mikheev, J. Supercond. Nov. Magn. 26, 2661 (2013). 1557-1939 10.1007/s10948-013-2155-y
R. Prozorov and V. G. Kogan, Rep. Prog. Phys. 74, 124505 (2011). 0034-4885 10.1088/0034-4885/74/12/124505
K. Sasmal, B. Lv, Z. Tang, F. Y. Wei, Y. Y. Xue, A. M. Guloy, and C. W. Chu, Phys. Rev. B 81, 144512 (2010). PRBMDO 1098-0121 10.1103/PhysRevB.81.144512
Y. Song, J. Ghim, J. Yoon, K. Lee, M. Jung, H. Ji, J. Shim, and Y. Kwon, Europhys. Lett. 94, 57008 (2011). EULEEJ 0295-5075 10.1209/0295-5075/94/57008
C. Ren, Z.-S. Wang, H.-Q. Luo, H. Yang, L. Shan, and H.-H. Wen, Phys. Rev. Lett. 101, 257006 (2008). PRLTAO 0031-9007 10.1103/PhysRevLett.101.257006
Anupam, P. L. Paulose, S. Ramakrishnan, and Z. Hossain, J. Phys.: Condens. Matter 23, 455702 (2011). JCOMEL 0953-8984 10.1088/0953-8984/23/45/ 455702
M. Abdel-Hafiez, J. Ge, A. N. Vasiliev, D. A. Chareev, J. Van de Vondel, V. V. Moshchalkov, and A. V. Silhanek, Phys. Rev. B 88, 174512 (2013). PRBMDO 1098-0121 10.1103/PhysRevB.88.174512
X. L. Wang, S. X. Dou, Z.-A. Ren, W. Yi, Z.-C. Li, Z.-X. Zhao, and S.-I. Lee, J. Phys.: Condens. Matter 21, 205701 (2009). JCOMEL 0953-8984 10.1088/0953-8984/21/20/205701
C. W. Hicks, T. M. Lippman, M. E. Huber, J. G. Analytis, J. H. Chu, A. S. Erickson, I. R. Fisher, and K. A. Moler, Phys. Rev. Lett. 103, 127003 (2009). PRLTAO 0031-9007 10.1103/PhysRevLett.103.127003
C. Ren, Z. S. Wang, H. Q. Luo, H. Yang, L. Shan, and H. H. Wen, Physica C 469, 599 (2009). PHYCE6 0921-4534 10.1016/j.physc.2009.03.015
L. Harnagea, S. Singh, G. Friemel, N. Leps, D. Bombor, M. Abdel-Hafiez, A. U. B. Wolter, C. Hess, R. Klingeler, G. Behr, S. Wurmehl, and B. Büchner, Phys. Rev. B 83, 094523 (2011). PRBMDO 1098-0121 10.1103/PhysRevB.83.094523
L. Shan, Y. L. Wang, B. Shen, B. Zeng, Y. Huang, A. Li, D. Wang, H. Yang, C. Ren, Q. H. Wang, Z. H. Pan, and H. H. Wen, Nat. Phys. 7, 325 (2010). 1745-2473 10.1038/nphys1908
H. Q. Luo, Z. S. Wang, H. Yang, P. Cheng, X. Y. Zhu, and H. H. Wen, Supercond. Sci. Technol. 21, 125014 (2008). SUSTEF 0953-2048 10.1088/0953-2048/21/12/125014
J. Moreland and J. W. Ekin, J. Appl. Phys. 58, 3888 (1985). JAPIAU 0021-8979 10.1063/1.335608
Yu. V. Sharvin, Zh. Eksp. Teor. Fiz. 48, 984 (1965)
Yu. V. Sharvin, [Sov. Phys. JETP 21, 655 (1965)].
A. F. Andreev, Zh. Eksp. Teor. Fiz. 46, 1823 (1964)
A. F. Andreev, [Sov. Phys. JETP 19, 1228 (1964)].
G. B. Arnold, J. Low Temp. Phys. 68, 1 (1987). JLTPAC 0022-2291 10.1007/BF00682620
T. P. Devereaux and P. Fulde, Phys. Rev. B 47, 14638 (1993). PRBMDO 0163-1829 10.1103/PhysRevB.47.14638
M. Octavio, M. Tinkham, G. E. Blonder, and T. M. Klapwijk, Phys. Rev. B 27, 6739 (1983). PRBMDO 0163-1829 10.1103/PhysRevB.27.6739
R. Kümmel, U. Gunsenheimer, and R. Nicolsky, Phys. Rev. B 42, 3992 (1990). PRBMDO 0163-1829 10.1103/PhysRevB.42.3992
A. Poenicke, J. C. Cuevas, and M. Fogelström, Phys. Rev. B 65, 220510(R) (2002). PRBMDO 0163-1829 10.1103/PhysRevB.65.220510
V. N. Zverev, A. V. Korobenko, G. L. Sun, C. T. Lin, and A. V. Boris, JETP Lett. 90, 130 (2009). JTPLA2 0021-3640 10.1134/S0021364009140100
Y. Machida, K. Tomokuni, T. Isono, K. Izawa, Y. Nakajima, and T. Tamegai, J. Phys. Soc. Jpn. 78, 073705 (2009). JUPSAU 0031-9015 10.1143/JPSJ.78.073705
B. Shen, H. Yang, Z.-S. Wang, F. Han, B. Zeng, L. Shan, C. Ren, and H.-H. Wen, Phys. Rev. B 84, 184512 (2011). PRBMDO 1098-0121 10.1103/PhysRevB.84. 184512
Z.-S. Wang, H.-Q. Luo, C. Ren, and H.-H. Wen, Phys. Rev. B 78, 140501(R) (2008). PRBMDO 1098-0121 10.1103/PhysRevB.78.140501
Ya. G. Ponomarev, Inst. Phys. Conf. Ser. No. 167, 241 (2000).
B. A. Aminov, L. I. Leonyuk, T. E. Oskina, Adv. Supercond. V, 1037 (1993). 10.1007/978-4-431-68305-6-232
E. van Heumen, J. Vuorinen, K. Koepernik, Phys. Rev. Lett. 106, 027002 (2011). PRLTAO 0031-9007 10.1103/PhysRevLett.106.027002
T. E. Kuzmicheva, S. A. Kuzmichev, M. G. Mikheev, Europhys. Lett. 102, 67006 (2013). EULEEJ 0295-5075 10.1209/0295-5075/102/67006
A. K. Pramanik, L. Harnagea, C. Nacke, A. U. B. Wolter, S. Wurmehl, V. Kataev, and B. Büchner, Phys. Rev. B 83, 094502 (2011). PRBMDO 1098-0121 10.1103/PhysRevB.83.094502
A. K. Pramanik, S. Aswartham, A. U. B. Wolter, S. Wurmehl, V. Kataev, and B. Büchner, J. Phys.: Condens. Matter 25, 495701 (2013). JCOMEL 0953-8984 10.1088/0953-8984/25/49/495701
M. E. McHenry, Physica C 190, 403 (1992). PHYCE6 0921-4534 10.1016/0921-4534(92)90699-D
M. Abdel-Hafiez, A. N. Vasiliev, D. A. Chareev, V. V. Moshchalkov, and A. V. Silhanek, Physica C 503, 143 (2014). 10.1016/j.physc.2014.04.018
V. V. Moshchalkov, J. Y. Henry, C. Marin, J. Rossat-Mignod, and J. F. Jacquot, Physica C 175, 407 (1991). PHYCE6 0921-4534 10.1016/0921-4534(91)90616- 7
C. S. Yadav and P. L. Paulose, New J. Phys. 11, 103046 (2009). NJOPFM 1367-2630 10.1088/1367-2630/11/10/103046
Z. Pribulova, T. Klein, J. Kacmarcik, C. Marcenat, M. Konczykowski, S. L. Budko, M. Tillman, and P. C. Canfield, Phys. Rev. B 79, 020508 (2009). PRBMDO 1098-0121 10.1103/PhysRevB.79.020508
R. Okazaki, M. Konczykowski, C. J. van der Beek, T. Kato, K. Hashimoto, M. Shimozawa, H. Shishido, M. Yamashita, M. Ishikado, H. Kito, A. Iyo, H. Eisaki, S. Shamoto, T. Shibauchi, and Y. Matsuda, Phys. Rev. B 79, 064520 (2009). PRBMDO 1098-0121 10.1103/PhysRevB.79.064520
S. L. Li, H. H. Wen, Z. W. Zhao, Y. M. Ni, Z. A. Ren, G. C. Che, H. P. Yang, Z. Y. Liu, and Z. X. Zhao, Phys. Rev. B 64, 094522 (2001). PRBMDO 0163-1829 10.1103/PhysRevB.64.094522
R. Liang, D. A. Bonn, W. N. Hardy, and D. Broun, Phys. Rev. Lett. 94, 117001 (2005). PRLTAO 0031-9007 10.1103/PhysRevLett.94.117001
A. L. Fetter and P. C. Hohenberg, in Superconductivity, edited by R. D. Parks (Dekker, New York, 1969), Chap. 14.
R. T. Gordon, N. Ni, C. Martin, M. A. Tanatar, M. D. Vannette, H. Kim, G. D. Samolyuk, J. Schmalian, S. Nandi, A. Kreyssig, A. I. Goldman, J. Q. Yan, S. L. Bud'ko, P. C. Canfield, and R. Prozorov, Phys. Rev. Lett. 102, 127004 (2009). PRLTAO 0031-9007 10.1103/PhysRevLett.102.127004
H. Luetkens, H.-H. Klauss, R. Khasanov, A. Amato, R. Klingeler, I. Hellmann, N. Leps, A. Kondrat, C. Hess, A. Kohler, G. Behr, J. Werner, and B. Büchner, Phys. Rev. Lett. 101, 097009 (2008). PRLTAO 0031-9007 10.1103/PhysRevLett.101.097009
A. J. Drew, F. L. Pratt, T. Lancaster, S. J. Blundell, P. J. Baker, R. H. Liu, G. Wu, X. H. Chen, I. Watanabe, V. K. Malik, A. Dubroka, K. W. Kim, M. Rossle, and C. Bernhard, Phys. Rev. Lett. 101, 097010 (2008). PRLTAO 0031-9007 10.1103/PhysRevLett.101.097010
M. Abdel-Hafiez, Phys. Rev. B 87, 180507 (R) (2013). PRBMDO 1098-0121 10.1103/PhysRevB.87.180507
J. S. Kim, B. D. Faeth, Y. Wang, P. J. Hirschfeld, G. R. Stewart, K. Gofryk, F. Ronning, A. S. Sefat, K. Y. Choi, and K. H. Kim, Phys. Rev. B 86, 014513 (2012). PRBMDO 1098-0121 10.1103/PhysRevB.86.014513
N. Xu, Phys. Rev. B 87, 094513 (2013). PRBMDO 1098-0121 10.1103/PhysRevB.87.094513
H. Miao, Phys. Rev. B 85, 094506 (2012). PRBMDO 1098-0121 10.1103/PhysRevB.85.094506
K. Hashimoto, T. Shibauchi, T. Kato, K. Ikada, R. Okazaki, H. Shishido, M. Ishikado, H. Kito, A. Iyo, H. Eisaki, S. Shamoto, and Y. Matsuda, Phys. Rev. Lett. 102, 017002 (2009). PRLTAO 0031-9007 10.1103/PhysRevLett.102.017002
Q. Q. Ge, Z. R. Ye, M. Xu, Y. Zhang, J. Jiang, B. P. Xie, Y. Song, C. L. Zhang, P. Dai, and D. L. Feng, Phys. Rev. X 3, 011020 (2013). 10.1103/PhysRevX.3.011020
M. P. Allan, A. W. Rost, A. P. Mackenzie, Y. Xie, J. C. Davis, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, and T.-M. Chuang, Science 336, 563 (2012). SCIEAS 0036-8075 10.1126/science.1218726
T. Kondo, A. F. Santander-Syro, O. Copie, C. Liu, M. E. Tillman, E. D. Mun, J. Schmalian, S. L. Budko, M. A. Tanatar, P. C. Canfield, and A. Kaminski, Phys. Rev. Lett. 101, 147003 (2008). PRLTAO 0031-9007 10.1103/PhysRevLett.101. 147003
Ya. G. Ponomarev, S. A. Kuzmichev, T. E. Kuzmicheva, J. Supercond. Novel Magn. 26, 2867 (2013). 1557-1939 10.1007/s10948-013-2264-7
R. Khasanov, D. V. Evtushinsky, A. Amato, H.-H. Klauss, H. Luetkens, Ch. Niedermayer, B. Büchner, G. L. Sun, C. T. Lin, J. T. Park, D. S. Inosov, and V. Hinkov, Phys. Rev. Lett. 102, 187005 (2009). PRLTAO 0031-9007 10.1103/PhysRevLett.102.187005
A. Carrington and F. Manzano, Physica C 385, 205 (2003). PHYCE6 0921-4534 10.1016/S0921-4534(02)02319-5
A. A. Kordyuk, Low Temp. Phys. 38, 888 (2012). LTPHEG 1063-777X 10.1063/1.4752092
O. V. Dolgov, R. K. Kremer, J. Kortus, A. A. Golubov, and S. V. Shulga, Phys. Rev. B 72, 024504 (2005). PRBMDO 1098-0121 10.1103/PhysRevB.72.024504
D. J. Scalapino, J. R. Schrieffer, and J. W. Wilkins, Phys. Rev. 148, 263 (1966). PHRVAO 0031-899X 10.1103/PhysRev.148.263
D. C. Johnston, Supercond. Sci. Technol. 26, 115011 (2013). SUSTEF 0953-2048 10.1088/0953-2048/26/11/115011
D. V. Evtushinsky, V. B. Zabolotnyy, T. K. Kim, Phys. Rev. B 89, 064514 (2014). PRBMDO 1098-0121 10.1103/PhysRevB.89.064514
