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Effect of hydrostatic pressure on the superconducting properties of quasi-1D superconductor K2Cr3As3
- Source :
- Journal of Physics: Condensed Matter. 29:455603
- Publication Year :
- 2017
- Publisher :
- IOP Publishing, 2017.
-
Abstract
- K2Cr3As3 is a newly discovered quasi-1D superconductor with a T c = 6.1 K and an upper critical field µ 0 H c2(0) ≈ 40 T three times larger than the Pauli paramagnetic limit µ 0 H p that is suggestive of a spin-triplet Cooper pairing. In this paper, we have investigated the effects of hydrostatic pressure on its T c and µ 0 H c2 by measuring the ac magnetic susceptibility χ'(T) under magnetic fields at various hydrostatic pressures up to 7.5 GPa. The major findings include: (1) T c is suppressed gradually to below 2 K at 7.5 GPa; (2) the estimated µ 0 H c2(0) decreases dramatically to below µ 0 H p above ~2 GPa and becomes slight lower than the orbital limiting field estimated from the initial slope of upper critical field via = −0.73T cdH c2/ in the clean limit; (3) the estimated Maki parameter α = √2/H p drops from 4 at ambient pressure to well below 1 at P > 2 GPa, suggesting the crossover from Pauli paramagnetic limiting to orbital limiting in the pair breaking process upon increasing pressure. These observations suggested that the application of hydrostatic pressure could drive K2Cr3As3 away from the ferromagnetic instability and lead to a breakdown of the spin-triplet pairing channel. We have also made a side-by-side comparison and discussed the distinct effects of chemical and physical pressures on the superconducting properties of K2Cr3As3.
- Subjects :
- Superconductivity
Materials science
Condensed matter physics
Hydrostatic pressure
Type-I superconductor
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Magnetic susceptibility
Paramagnetism
Ferromagnetism
0103 physical sciences
General Materials Science
010306 general physics
0210 nano-technology
Critical field
Ambient pressure
Subjects
Details
- ISSN :
- 1361648X and 09538984
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Journal of Physics: Condensed Matter
- Accession number :
- edsair.doi...........867a24955bb42dc3666a5283d7000a80