Pressure-driven evolution of upper critical field and Fermi surface reconstruction in the strong-coupling superconductor Ti4Ir2O
Lifen Shi, Binbin Ruan, Pengtao Yang, Ningning Wang, Pengfei Shan, Ziyi Liu, Jianping Sun, Yoshiya Uwatoko, Genfu Chen, Zhian Ren, Bosen Wang, Jinguang Cheng
DOI 10.1103/PhysRevB.107.174525 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report pressure-driven evolution of the superconducting transition temperature (Tc) and upper critical field Bc2 (0) of strong-coupling superconductor Ti4Ir2O that possesses an unusually large Bc2 (0) at ambient pressure (AP). Our results reveal an extremely low-pressure coefficients of Tc, i.e., dTc/dP≈−0.047 K/GPa for P<15 GPa and −0.017 K/GPa for 15<P<50 GPa, presumably associated with an inherent large bulk modulus of ∼252 GPa. Interestingly, we find that its Bc2 (0) undergoes a smooth crossover at 35.6 GPa from well beyond to less than the Pauli paramagnetic limit BpBCS(0)=1.84Tc; i.e., the Bc2(0)≈18.2 T=1.7BpBCS (0) at AP decreases to ∼5.8 T=0.88BpBCS (0) at 50 GPa. The density-functional calculations predict the possible occurrence of pressure-induced Fermi surface reconstruction for the energy bands near the K point with strong spin-orbit coupling in 31–41 GPa. The present work sheds more light on this intriguing superconductor capable of resisting large external compression and strong magnetic fields.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ti4Ir2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure unresolved | onset |
| Ti4Ir2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.3 | Pressure unresolved | unknown |
| Ti4Co2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.7 | Pressure not reported | unknown |
| Ti4Rh2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure not reported | unknown |
Similar papers
Ti4Ir2O: A time reversal invariant fully gapped unconventional superconductor
similarity 0.94Debarchan Das et al.
Source status unknown — claims are unverified
Structure, composition, and high-field superconductivity in metal-rich η-carbide-type compounds
similarity 0.93Manuele Balestra et al.
Source status unknown — claims are unverified
Large critical fields in superconducting Ti4Ir2O from spin-orbit coupling
similarity 0.92Hao Wu et al.
Source status unknown — claims are unverified
Pressure-Induced 18 K Superconductivity and Two Superconducting Phases in CuIr2S4
similarity 0.91Bijuan Chen et al.
Source status unknown — claims are unverified
Upper critical field of Ti and α−TiAl alloys: Evidence of an intrinsic type-II superconductivity in pure Ti
similarity 0.91Liu Shumei et al.
Source status unknown — claims are unverified
Pressure-induced resurgence of the superconducting transition in spinel MgTi2O4 thin films
similarity 0.91Lifen Shi et al.
Source status unknown — claims are unverified