Suppression of metal-to-insulator transition and stabilization of superconductivity by pressure in Re3Ge7

Huyan, Shuyuan; Mun, Eundeok; Wang, H.; Slade, T. J.; Li, Z.; Schmidt, J.; Ribeiro, Raquel A.; Xie, W.; Bud'ko, S. L.; Canfield, P. C.

doi:10.1103/physrevb.109.174522

Suppression of metal-to-insulator transition and stabilization of superconductivity by pressure in Re3 Ge7

Journal Article · Tue May 21 00:00:00 EDT 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.109.174522· OSTI ID:2382786

^[1]; ^[2]; Wang, H. ^[3]; Slade, T. J. ^[1]; Li, Z. ^[1]; Schmidt, J. ^[1]; ^[1]; Xie, W. ^[3]; ^[1]; Canfield, P. C. ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Simon Fraser Univ., Burnaby, BC (Canada)
Michigan State Univ., East Lansing, MI (United States)

The effect of pressure on the low-temperature states of the Re₃⁡Ge₇ is investigated by both electrical and Hall resistance and magnetization measurements. At ambient pressure, the temperature-dependent resistance of Re₃⁡Ge₇ behaves quasilinearly from room temperature down to 60 K, then undergoes a two-step metal-to-insulator transition (MIT) at temperatures T₁=59.4K and T₂=58.7K, which may be related to a structural phase transition or occurrence of charge-density wave ordering. Upon applying pressure, the two-step (T₁,T₂) MIT splits into three steps (T₁,T₂. and T₃) above 1 GPa, and all traces of MITs are fully suppressed by ~8 GPa. Subsequently, the onset of bulk superconductivity (SC) occurs between 10.8 and 12.2 GPa and persists to our highest pressure of 26.8 GPa. At 12.2 GPa the superconducting transition temperature, T_c, and upper critical field, H_c⁢2 reach the maximum of T_c (onset) ~5.9 K and H_c⁢2 (1.8 K) ~14 kOe. Finally, our results not only present the observation of SC under high pressure in Re₃⁡Ge₇ but also delineate the interplay between SC and other competing electronic states by creating a T-p phase diagram for this potentially topologically nontrivial system Re₃⁡Ge₇.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Advancement of Topological Semimetals (CATS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358; SC0023648

OSTI ID:: 2382786

Alternate ID(s):: OSTI ID: 2356996

Report Number(s):: IS-J--11,348

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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