Superconducting transition in the Presence of Magnetic order in BaFe1.89Co0.11As2

Title & Authors
Superconducting transition in the Presence of Magnetic order in BaFe1.89Co0.11As2
Kim, K.W.; Wolf, T.; Bernhard, C.;

Abstract
We report optical spectra of underdoped $\small{BaFe_{1.89}Co_{0.11}As_2}$ that hosts both of magnetic and superconducting orders. The temperature dependent evolution of optical conductivity shows finger prints of the magnetic order and the s-wave nature of the superconducting gaps. Careful inspection on the superconducting state reveals that the two orders compete but coexist in the ground state.
Keywords
Superconductivity and magnetism;competing order;
Language
English
Cited by
References
1.
D. N. Basov and Andrey V. Chubukov, "Manifesto for a higher \$T_c\$," Nat. Phys., vol. 7, p. 272, 2011.

2.
P. Marsik et al., "Coexistence and competition of magnetism and superconductivity on the nanometer scale in underdoped \$BaFe_{1.89}Co_{0.11}As_2\$," Phys. Rev. Lett., vol. 105, p. 057001, 2010.

3.
J. Larsen et al., "Competing superconducting and magnetic order parameters and field-induced magnetism in electron-doped \$Ba(Fe_{1-x}Co_{x})_{2}As_{2}\$," Phys. Rev. B, vol. 91, p. 024504, 2015.

4.
C. Bernhard et al., "Muon spin rotation study of magnetism and superconductivity in \$Ba(Fe_{1-x}Co_{x})_{2}As_{2}\$ single crystals," Phys. Rev. B, vol. 86, p. 184509, 2012.

5.
F. Hardy, P. Adelmann, T. Wolf, H. v. Lohneysen, and C. Meingast, Phys. Rev. Lett., vol. 102, p. 187004, 2009.

6.
K.W. Kim et al., "Evidence for multiple superconducting gaps in optimally doped \$BaFe_{1.87}Co_{0.13}As_2\$ from infrared spectroscopy," Phys. Rev. B vol. 81, p. 214508, June 2010.

7.
M. Dressel and G. Gruner, Electrodynamics of solids: optical properties of electrons in matter, Cambridge University Press, 2002.

8.
S. J. Moon et al., "Infrared pseudogap in cuprate and pnictide high-temperature superconductors," Phys. Rev. B, vol. 90, p. 014503, 2014.

9.
E. van Heumen et al., "Optical properties of \$BaFe_{2-x}Co_{x}As_{2}\$," Euro. Phys. Lett., vol. 90, p. 37005, 2010.

10.
C. Homes et al., "Electronic correlations and unusual superconducting response in the optical properties of the iron-chalcogenide FeTe0.55S0.45," Phys. Rev. B, vol. 81, p. 180508(R), 2010.

11.
W. Zimmermann, E. H. Brandt, M. Bauer, E. Seider, and L. Genzel, "Optical conductivity of BCS superconductors with arbitrary purity," Physica C, vol. 183, pp. 99-104, 1991.

12.
G. Li et al., "Probing the superconducting energy gap from infrared spectroscopy on a \$Ba_{0.6}K_{0.4}Fe_2As_2\$ single crystal with \$T_c\$ = 37 K," Phys. Rev. Lett., vol. 101, p. 107004, 2008.

13.
K. E. Kornelsen, M. Dressel, and J. E. Eldrige, "Far-infrared optical absorption and reflectivity of a superconducting NbN film," Phys. Rev. B, vol. 44, pp. 11882-11887, 1991.

14.
Z. Schlesinger, R. T. Collins, M. W. Shafer, and E. M Engler, "Normal-state reflectivity and superconducting energy gap measurement of \$La_{2-x}Sr_xCuO_4\$," Phys. Rev. B, vol. 36, pp. 5275-5278, 1987.

15.
U. Nagel et al., "Far-infrared signature of the superconducting gap in intercalated graphite \$CaC_6\$," Phys. Rev. B, vol. 78, p. 041404(R), 2008.

16.
M. J. Holcomb, J. P. Collman, and W. A. Little, "Optical evidence of an electronic contribution to the pairing interaction in superconducting \$Tl_2Ba_2Ca_2Cu_3O_{10}\$," Phys. Rev. Lett., vol. 73, pp. 2360-2363, 1994.

17.
A. V. Boris et al., "In-plane spectral weight shift of charge carriers in \$YBa_2Cu_3O_{6.9}\$," Science, vol. 304, pp. 708-710, April 2004.

18.
A. Charnukha et al., "Superconductivity-induced optical anomaly in an iron arsenide," Nat. Commun., vol. 2, p. 219, 2011.