Resistivity and magnetoresistance of FeSe single crystals under Helium-gas pressure

Abstract

We present temperature-dependent in-plane resistivity measurements on FeSe single crystals under He-gas pressure up to 800 MPa and magnetic fields $B\le$ 10 T. A sharp phase transition anomaly is revealed at the tetragonal-to-orthorhombic transition at $T_s$ slightly below 90 K. $T_s$ becomes reduced with increasing pressure in a linear fashion at a rate d$T_s$/d$P$ $\simeq$ -31 K/GPa. This is accompanied by a $P$-linear increase of the superconducting transition temperature at $T_c\sim$ 8.6 K with d$T_c$/d$P$ $\simeq$ +5.8 K/GPa. Pressure studies of the normal-state resistivity highlight two distinctly different regimes: for $T>T_s$, i.e., in the tetragonal phase, the in-plane resistivity changes strongly with pressure. This contrasts with the state deep in the orthorhombic phase at $T\ll T_s$, preceding the superconducting transition. Here a $T$-linear resistivity is observed the slope of which does not change with pressure. Resistivity studies in varying magnetic fields both at ambient and finite pressure reveal clear changes of the magnetoresistance, $\Delta \rho \propto B^2$, upon cooling through $T_s$. Our data are consistent with a reconstruction of the Fermi surface accompanying the structural transition.

References in corpus (22)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• High-temperature superconductivity in iron-based materials
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• The superconductivity at 18 K in LiFeAs system
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?
• Orbital-driven nematicity in FeSe
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Emergence of the nematic electronic state in FeSe
• Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study
• Lifting of xz/yz orbital degeneracy at the structural transition in detwinned FeSe
• Anomalous Fermi surface in FeSe seen by Shubnikov-de Haas oscillation measurements
• The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure
• Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides
• Electronic Structure of Fe-Based Superconductors
• Pressure-induced antiferromagnetic transition and phase diagram in FeSe
• Pressure-Induced Effects on the Structure of the FeSe Superconductor
• Electric Transport of a Single Crystal Iron Chalcogenide FeSe Superconductor: Evidence of Symmetry Breakdown Nematicity and Additional Ultrafast Dirac cone-Like Carriers

Cited by in corpus (4)

• Nematicity, magnetism and superconductivity in FeSe
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Probing the direct factor for superconductivity in FeSe-Based Superconductors by Raman Scattering
• Vortex dynamics in $\beta$-FeSe single crystals: effects of proton irradiation and small inhomogeneous stress