Multi-band mass enhancement towards critical doping in a pnictide superconductor
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Abstract
Abstract Near critical doping, high-temperature superconductors exhibit multiple anomalies associated with enhanced electronic correlations and quantum criticality. Quasiparticle mass enhancement approaching optimal doping has been reported in quantum oscillation measurements in both cuprate and pnictide superconductors. Although the data are suggestive of enhanced interactions, the microscopic theory of quantum oscillation measurements near a quantum critical point is not yet firmly established. It is therefore desirable to have a direct thermodynamic measurement of quasiparticle mass. Here we report high-magnetic field measurements of heat capacity in the doped pnictide superconductor BaFe2(As1−xPx)2. We observe saturation of the specific heat at high magnetic field in a broad doping range above optimal doping which enables a direct determination of the electronic density of states recovered when superconductivity is suppressed. Our measurements find a strong total mass enhancement in the Fermi pockets that superconduct. This mass enhancement extrapolates to a mass divergence at a critical doping of x = 0.28.
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Research context
OpenAlex topics: Iron-based superconductors research · Physics of Superconductivity and Magnetism · Rare-earth and actinide compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (39)
Show source-provided references
1. Ramshaw, B. J. et al. Quasiparticle mass enhancement approaching optimal doping in a high- T c superconductor. Science 348, 317–320 (2015).10.1126/science.aaa4990 ↗
2. Shekhter, A., Modic, K. A., McDonald, R. D. & Ramshaw, B. J. Thermodynamic constraints on the amplitude of quantum oscillations. Phys. Rev. B. 95, 122206 (2017).10.1103/PhysRevB.95.121106 ↗
3. Walmsley, P. et al. Quasiparticle mass enhancement close to the quantum critical point. Phys. Rev. Lett. 110, 257002 (2013).10.1103/PhysRevLett.110.257002 ↗
4. Shishido, H. et al. Evolution of the Fermi surface of BaFe2(As1−xPx)2 on entering the superconducting dome. Phys. Rev. Lett. 104, 057008 (2010).10.1103/PhysRevLett.104.057008 ↗
5. Carrington, A. Quantum oscillation studies of the Fermi surface of iron-pnictide superconductors. Rep. Prog. Phys. 74, 124507 (2011).10.1088/0034-4885/74/12/124507 ↗
6. Grinenko, V. et al. Selective mass enhancement close to the quantum critical point in BaFe2(As1−xPx)2. Sci. Rep. 7, 4589 (2017).10.1038/s41598-017-04724-3 ↗
7. Kuo, H.-H., Chu, J.-H., Palmstrom, J. C., Kivelson, S. A. & Fisher, I. R. Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors. Science 352, 958–962 (2016).10.1126/science.aab0103 ↗
8. Analytis, J. G. et al. Transport near a quantum critical point in BaFe2(As1−xPx)2. Nat. Phys. 10, 194–197 (2014).10.1038/nphys2869 ↗
9. Bohmer, A. E. et al. Nematic susceptibility of hole-doped and electron-doped BaFe2As2 iron-based superconductor from shear modulus measurements. Phys. Rev. B 112, 047001 (2014).
10. Hardy, F. et al. Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe1−xCox)As2 iron pnictides. EPL 91, 47008 (2010).10.1209/0295-5075/91/47008 ↗
11. Yoshizawa, M. et al. Structural quantum criticality and superconductivity in iron-based superconductor Ba(Fe1−xCox)As2. J. Phys. Soc. Jpn. J. Phys. Soc. 81, 024604 (2012).10.1143/JPSJ.81.024604 ↗
12. Diao, Z. et al. Microscopic parameters from high-resolution specific heat measurements on superoptimally substituted BaFe2(As1−xPx)2 single crystals. Phys. Rev. B 93, 014509 (2016).10.1103/PhysRevB.93.014509 ↗
13. Campanini, A. et al. Superconducting gap evolution in overdoped BaFe2(As1−xPx)2 single crystals through nanocalorimetry. Rep. Prog. Phys. 91, 245142 (2015).
14. Chaparro, C. et al. Doping dependence of the specific heat of single-crystal BaFe2(As1−xPx)2. Phys. Rev. B 85, 184525 (2012).10.1103/PhysRevB.85.184525 ↗
15. Zaanen, J. Specific-heat jump at the superconducting transition and the quantum critical nature of the normal state of pnictide superconductors. Phys. Rev. B 80, 212502 (2009).10.1103/PhysRevB.80.212502 ↗
16. Putzke, C. et al. Anomalous critical fields in quantum critical superconductors. Nat. Commun. 5, 5679 (2014).10.1038/ncomms6679 ↗
17. Zhang, Y. et al. Nodal superconducting-gap structure in ferropnictide superconductor BaFe2(As0.7P0.3)2. Nat. Phys. 8, 371–375 (2012).10.1038/nphys2248 ↗
18. Hashimoto, K. et al. Line nodes in the energy of superconducting BaFe2(As1−xPx)2 single crystals as seen via penetration depth and thermal conductivity. Phys. Rev. B 81, 220501(R) (2010).10.1103/PhysRevB.81.220501 ↗
19. Malone, L. et al. Superconducting gap structure of BaFe2(As1−xPx)2. Preprint at https://arXiv.org/abs/1409.7523 (2014).
20. Reid, J.-Ph et al. Nodes in the gap structure of the iron arsenide superconductor Ba(Fe1−xCox)As2 from c-axis heat transport measurements. Phys. Rev. B. 82, 064501 (2010).10.1103/PhysRevB.82.064501 ↗
21. Tanatar, M. A. et al. Doping dependence of heat transport in the iron-arsenide superconductor Ba(Fe1−xCox)As2: from isotropic to a strongly k-dependent structure. Phys. Rev. Lett. 104, 067002 (2010).10.1103/PhysRevLett.104.067002 ↗
22. Murphy, J. et al. Angular-dependent upper critical field of overdoped Ba(Fe1−xNix)As2. Phys. Rev. B 87, 094505 (2013).10.1103/PhysRevB.87.094505 ↗
23. Volovik, G. E. Superconductivity with lines of GAP nodes: density of states in the vortex. Pis’ma Zh. Eksp. Teor. Fiz. 58, 457–461 (1993).
24. Kopnin, N. B. & Volovik, G. E. Flux Flow in d-wave superconductors: low temperature universality and scaling. Phys. Rev. Lett. 79, 1377 (1997).10.1103/PhysRevLett.79.1377 ↗
25. Hussey, N. E. Low-energy quasiparticles in high-Tc cuprates. Adv. Phys. 51, 1685–1771 (2002).10.1080/00018730210164638 ↗
26. Arnold, B. J. et al. Nesting of electron and hole Fermi surfaces in nonsuperconducting BaFe2(As1−xPx)2. Phys. Rev. B 83, 220504(R) (2011).10.1103/PhysRevB.83.220504 ↗
27. Keimer, B., Kivelson, S. A., Norman, M. R., Uchida, S. & Zaanen, J. From quantum matter to high-temperature superconductivity in copper oxides. Nature 518, 179–186 (2015).10.1038/nature14165 ↗
28. Oganesyan, V., Kivelson, S. A. & Fradkin, E. Quantum theory of a nematic Fermi fluid. Phys. Rev. B 64, 195109 (2001).10.1103/PhysRevB.64.195109 ↗
29. Kogan, V. G. Strong pairbreaking in anisotropic superconductors. Phys. Rev. B 81, 184528 (2010).10.1103/PhysRevB.81.184528 ↗
30. Hardy, F. et al. Strong correlations, strong coupling, and s-wave superconductivity in hole-doped BaFe2As2 single crystals. Phys. Rev. B 94, 205113 (2016).10.1103/PhysRevB.94.205113 ↗
31. Varma, C. M., Littlewood, P. B., Schmitt-Rink, S., Abrahams, E. & Ruckenstein, A. Phenomenology of the normal state of Cu-O high-temperature superconductors. Phys. Rev. Lett. 63, 1996–1999 (1989).10.1103/PhysRevLett.63.1996 ↗
32. Anderson, P. W. Experimental constraints on the theory of High-Tc superconductivity. Science 12, 1526–1531 (1992).10.1126/science.256.5063.1526 ↗
33. Zaanen, J., Sun, Y. W., Liu, Y. & Schalm, K. Holographic Duality for Condensed Matter Physics (Cambridge University Press, 2015).10.1017/CBO9781139942492 ↗
34. Davison, R. A., Schalm, K. & Zaanen, J. Holographic duality and the resistivity of strange metals. Phys. Rev. B 89, 245116 (2014).10.1103/PhysRevB.89.245116 ↗
35. Hayes, I. M. et al. Scaling between magnetic field and temperature in the high-temeprature superconductor BaFe2(As1−xPx)2. Nature 12, 916–919 (2016).
36. Giraldo-Gallo, P. et al. Scale-invariant magnetoresistance in a cuprate superconductor. Science 361, 479–481 (2018).10.1126/science.aan3178 ↗
37. Nakajima, M. et al. Growth of BaFe2(As1−xPx)2 single crystals (0 ≤ x ≤ 1) by Ba2As3/Ba2P3-flux method. J. Phys. Soc. Jpn. 81, 104710 (2012).10.1143/JPSJ.81.104710 ↗
38. Analytis, J. G., Chu, J.-H., McDonald, R. D., Riggs, S. C. & Fisher, I. R. Enhanced Fermi-surface nesting in superconducting BaFe2(As1−xPx)2 revealed by the de Haas-van Alphen effect. Phys. Rev. Lett. 105, 207004 (2010).10.1103/PhysRevLett.105.207004 ↗
39. Hashimoto, K. et al. A sharp peak of the zero-temperature penetration depth at optimal composition in BaFe2(As1−xPx)2. Science 336, 1554–1557 (2012).10.1126/science.1219821 ↗