Enhanced superconductivity near a pressure-induced quantum critical point of strongly coupled charge density wave order in 2H-Pd0.05TaSe2
Source abstract
Abstract
Abstract Interplay between charge density wave (CDW) order and superconductivity (SC) in quasi-two-dimensional materials remains poorly understood due to their diverse experimental varieties. Here, we investigate the pressure-dependent electrical transport and Raman scattering spectra of 2 H -Pd 0.05 TaSe 2 , which exhibits a CDW transition at T CDW = 115 K and a superconducting transition at T c = 2.6 K at ambient pressure conditions. As pressure increases, T CDW , identified by the resistivity anomaly, shifts towards lower temperatures and approaches zero at a critical pressure of P c ~ 21.5 GPa. At this critical pressure, both T c and upper critical field H c2 reach their maximum values of ~ 8.5 K and ~ 6.4 T, respectively. Analysis of the Raman scattering spectra demonstrates that increasing pressure systematically suppresses both the two-phonon spectral weight above T CDW and the CDW amplitudon energies below T CDW, leading to their simultaneous disappearance at P c . These observations provide direct evidence for the formation of a CDW quantum critical point (QCP) at P c , indicating that charge and lattice fluctuations associated with the QCP of strongly coupled CDW order may enhance SC in pressurized 2 H -Pd 0.05 TaSe 2 .
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Research context
OpenAlex topics: Iron-based superconductors research · Rare-earth and actinide compounds · Organic and Molecular Conductors Research
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References (44)
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1. Proust, C. & Taillefer, L. The remarkable underlying ground states of cuprate superconductors. Annu. Rev. Condens. Matter Phys. 10, 409–429 (2019).10.1146/annurev-conmatphys-031218-013210 ↗
2. Park, T. et al. Hidden magnetism and quantum criticality in the heavy fermion superconductor CeRhIn5. Nature 440, 65–68 (2006).10.1038/nature04571 ↗
3. Stockert, O. & Steglich, F. Unconventional quantum criticality in heavy-fermion compounds. Annu. Rev. Condens. Matter Phys. 2, 79–99 (2011).10.1146/annurev-conmatphys-062910-140546 ↗
4. Si, Q., Yu, R. & Abrahams, E. High-temperature superconductivity in iron pnictides and chalcogenides. Nat. Rev. Phys. 1, 16017 (2016).
5. Ortiz, B. R. et al. New kagome prototype materials: discovery of KV3Sb5, RbV3Sb5, and CsV3Sb5. Phys. Rev. Mater. 3, 094407 (2019).10.1103/PhysRevMaterials.3.094407 ↗
6. Bilbrom, G. & McMillan, W. L. Theoretical model of superconductivity and the martensitic transformation in A15 compounds. Phys. Rev. B 14, 5 (1976).
7. Das, T. & Dolui, D. Superconducting dome in MoS2 and TiSe2 generated by quasiparticle-phonon coupling. Phys. Rev. B 91, 094510 (2015).10.1103/PhysRevB.91.094510 ↗
8. Halbinger, J., Pimenov, D. & Punk, M. Incommensurate 2kF density wave quantum criticality in two-dimensional metals. Phys. Rev. B 99, 195102 (2019).10.1103/PhysRevB.99.195102 ↗
9. Sipos, B. et al. From Mott state to superconductivity in 1T-TaS2. Nat. Mater. 7, 960–965 (2008).10.1038/nmat2318 ↗
10. Wang, B. et al. Universal phase diagram of superconductivity and charge density wave versus high hydrostatic pressure in pure and Se-doped 1T-TaS2. Phys. Rev. B 97, 220504 (2018).10.1103/PhysRevB.97.220504 ↗
11. Moulding, O., Osmond, I., Flicker, F., Muramatsu, T. & Friedemann, S. Absence of superconducting dome at the charge-density-wave quantum phase transition in 2H -NbSe2. Phys. Rev. Res. 2, 043392 (2020).10.1103/PhysRevResearch.2.043392 ↗
12. Gruner, T. et al. Charge density wave quantum critical point with strong enhancement of superconductivity. Nat. Phys. 13, 967–972 (2017).10.1038/nphys4191 ↗
13. Goh, S. K. et al. Ambient pressure structural quantum critical point in the phase diagram of (CaxSr1−x)3Rh4Sn13. Phys. Rev. Lett. 114, 097002 (2015).10.1103/PhysRevLett.114.097002 ↗
14. Moncton, D. E., Axe, J. D. & DiSalvo, F. J. Neutron scattering study of the charge-density wave transitions in 2H-TaSe2 and 2H-NbSe2. Phys. Rev. B 16, 801 (1977).10.1103/PhysRevB.16.801 ↗
15. Yokota, K., Kurata, G., Matsui, T. & Fukuyama, H. Superconductivity in the quasi-two-dimensional conductor 2H-TaSe2. Physica B Condens. Matter. 284, 551 (2000).10.1016/S0921-4526(99)02166-3 ↗
16. Bhoi, D. & Khim, S. et al. Interplay of charge density wave and multiband superconductivity in 2H-PdxTaSe2. Sci. Rep. 6, 24068 (2016).10.1038/srep24068 ↗
17. Li, L. et al. Superconducting order from disorder in 2H-TaSe2-xSx. npj Quantum Mater 2, 11 (2017).10.1038/s41535-017-0016-9 ↗
18. Borisenko, S. V. et al. Pseudogap and charge density waves in two dimensions. Phys. Rev. Lett. 100, 196402 (2008).10.1103/PhysRevLett.100.196402 ↗
19. Petkov, V., Chapagain, K., Shastri, S. & Ren, Y. Genesis of the periodic lattice distortions in the charge density wave state of 2H-TaSe2. Phys. Rev. B 101, 121114 (2020).10.1103/PhysRevB.101.121114 ↗
20. Baek, S. –H., Sur, Y., Kim, K. H., Vojta, M. & Büchner, B. Interplay of charge density waves, disorder, and superconductivity in 2H-TaSe2 elucidated by NMR. New J. Phys. 24, 043008 (2022).10.1088/1367-2630/ac5eec ↗
21. Shen, X. & Heid, R. et al. Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2. Nat. Commun. 14, 7282 (2023).10.1038/s41467-023-43094-5 ↗
22. Hill, H. M. et al. Phonon origin and lattice evolution in charge density wave states. Phys. Rev. B 99, 1 (2019).10.1103/PhysRevB.99.174110 ↗
23. Klein, M. V. Theory of two-phonon Raman scattering in transition metals and compounds. Phys. Rev. B 24, 4208 (1981).10.1103/PhysRevB.24.4208 ↗
24. Dai, J. et al. Microscopic evidence for strong periodic lattice distortion in two-dimensional charge-density wave systems. Phys. Rev. B 89, 165140 (2014).10.1103/PhysRevB.89.165140 ↗
25. Zhu, X., Gue, J., Zhang, J. & Plummer, E. W. Misconceptions associated with the origin of charge density waves. Adv. Phys.: X 2, 622–640 (2017).
26. Gruner, G. Density waves in solids (Perseus Publishing, Cambridge, MA, USA, 2000).
27. Zhao, X. –M. et al. Pressure tuning of the charge density wave and superconductivity in 2H-TaS2. Phys. Rev. B 101, 134506 (2020).10.1103/PhysRevB.101.134506 ↗
28. Chen, L. –C. & Chen, P.-Q. et al. Enhancement of thermoelectric performance across the topological phase transition in dense lead selenide. Nat. Mater. 18, 1321–1326 (2019).10.1038/s41563-019-0499-9 ↗
29. Vescoli, V., Degiorgi, L., Berger, H. & Forró, L. Dynamics of correlated two-dimensional materials: the 2H-TaSe2 case. Phys. Rev. Lett. 81, 453–456 (1998).10.1103/PhysRevLett.81.453 ↗
30. Chikina, A. et al. Turning charge-density waves into Cooper pairs. npj Quantum Mater 5, 22 (2020).10.1038/s41535-020-0225-5 ↗
31. Kim, C. et al. Experimental signatures of nodeless multiband superconductivity in a 2H-Pd0.08TaSe2 single crystal. Sci. Rep. 11, 13383 (2021).10.1038/s41598-021-92709-8 ↗
32. Evtushinsky, D. V. et al. Pseudogap-driven sign reversal of the Hall effect. Phys. Rev. Lett. 100, 236402 (2008).10.1103/PhysRevLett.100.236402 ↗
33. Werthamer, N. R., Helfand, E. & Hohenberg, P. C. Temperature and purity dependence of the superconducting critical field, Hc2. III. Electron spin and spin-orbit effects. Phys. Rev. 147, 945 (1964).
34. Tinkham, M. Introduction to Superconductivity 2nd ed. (Dover Publications, Garden City, NY, USA, 2004).
35. Pan, J. et al. Nodal superconductivity and superconducting dome in the layered superconductor Ta4Pd3Te16. Phys. Rev. B 92, 180505 (2015).10.1103/PhysRevB.92.180505 ↗
36. Bauer, E. D. et al. Pressure-induced superconducting state and effective mass enhancement near the antiferromagnetic quantum critical point of CePt2In7. Phys. Rev. B 81, 180507 (2010).10.1103/PhysRevB.81.180507 ↗
37. Knebel, G. & Aoki, D. et al. Competition and/or coexistence of antiferromagnetism and superconductivity in CeRhIn5 and CeCoIn5. Phys. Status Solidi B 247, 557 (2010).10.1002/pssb.200983061 ↗
38. Leroux, M. & Errea, I. et al. Strong anharmonicity induces quantum melting of charge density wave in 2H−NbSe2 under pressure. Phys. Rev. B 92, 140303 (2015).10.1103/PhysRevB.92.140303 ↗
39. Feng, Y. et al. Order parameter fluctuations at a buried quantum critical point. Proc. Natl. Acad. Sci. USA 109, 7224 (2012).10.1073/pnas.1202434109 ↗
40. Kadowaki, K. & Woods, S. Universal relationship of the resistivity and specific heat in heavy-fermion compounds. Sol. State Comm. 58, 507 (1986).10.1016/0038-1098(86)90785-4 ↗
41. Marder, M. Condensed Matter Physics 2nd ed. (John Wiley & Sons, Inc., Hoboken, NJ, USA, 2010).
42. Shi, Z. et al. Incommensurate two-dimensional checkerboard charge density wave in the low-dimensional superconductor Ta4Pd3Te16. Phys. Rev. Res. 2, 042042 (2020).10.1103/PhysRevResearch.2.042042 ↗
43. Freitas, D. C. et al. Strong enhancement of superconductivity at high pressures within the charge-density-wave states of 2H-TaS2 and 2H-TaSe2. Phys. Rev. B 93, 184512 (2016).10.1103/PhysRevB.93.184512 ↗
44. Lee, Y. et al. Coupling between electrons and charge density wave fluctuation and its possible role in superconductivity. Adv. Sci. 2406043 (2024).10.1002/advs.202406043 ↗