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Title: Nonmonotonic pressure evolution of the upper critical field in superconducting FeSe

Journal Article · · Physical Review B

The pressure dependence of the upper critical field, Hc2,c, of single crystalline FeSe was studied using measurements of the interplane resistivity, ρc, in magnetic fields parallel to tetragonal c axis. Hc2,c(T) curves obtained under hydrostatic pressures up to 1.56 GPa, the range over which the superconducting transition temperature, Tc, of FeSe exhibits a nonmonotonic dependence with local maximum at p1 ≈ 0.8 GPa and local minimum at p2 ≈ 1.2 GPa. The slope of the upper critical field at Tc,(dHc2,c/dT)Tc, also exhibits a nonmonotonic pressure dependence with distinct changes at p1 and p2. For p < p1 the slope can be described within a multiband orbital model. For both p1 < p < p2 and p > p2 the slope is in good semiquantitative agreement with a single band, orbital Helfand-Werthamer theory with Fermi velocities determined from Shubnikov–de Haas measurements. Lastly, this finding indicates that Fermi surface changes are responsible for the local minimum of Tc(p) at p2 ≈ 1.2 GPa.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1240742
Alternate ID(s):
OSTI ID: 1236530
Report Number(s):
IS-J-8850; PRBMDO
Journal Information:
Physical Review B, Vol. 93, Issue 6; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (10)

Superconductivity-enhanced nematicity and “ s + d ” gap symmetry in Fe(Se 1−x S x ) journal July 2016
Effect of Hydrostatic Pressure on Superconductivity of FeSe Thin Films journal June 2019
Strong cooperative coupling of pressure-induced magnetic order and nematicity in FeSe journal September 2016
Nematicity, magnetism and superconductivity in FeSe journal December 2017
Discovery of orbital-selective Cooper pairing in FeSe journal July 2017
Superconductivity-enhanced Nematicity and '$s+d$' Gap Symmetry in Fe(Se$_{1-x}$S$_x$) text January 2016
Dome of magnetic order inside the nematic phase of sulfur-substituted FeSe under pressure text January 2017
BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe text January 2017
NMR evidence for static local nematicity and its cooperative interplay with low-energy magnetic fluctuations in FeSe under pressure text January 2017
Effect of pressure on the physical properties of the superconductor NiBi3 text January 2018

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