Melting of vortex lattice in magnetic superconductor $\mathrm{Rb}\mathrm{Eu}{\mathrm{Fe}}_4{\mathrm{As}}_4$

Abstract

The iron-based superconductors are characterized by strong fluctuations due to high transition temperatures and small coherence lengths. We investigate fluctuation behavior in the magnetic iron-pnictide superconductor $\mathrm{Rb}\mathrm{Eu}{\mathrm{Fe}}_4{\mathrm{As}}_4$ by calorimetry and transport. We find that the broadening of the specific-heat transition in magnetic fields is very well described by the lowest-Landau-level scaling. We report calorimetric and transport observations for vortex-lattice melting, which is seen as a sharp drop of the resistivity and a step of the specific heat at the magnetic-field-dependent temperature. The melting line in the temperature/magnetic-field plane lies noticeably below the upper-critical-field line and its location is in quantitative agreement with theoretical predictions without fitting parameters. Finally, we compare the melting behavior of $\mathrm{Rb}\mathrm{Eu}{\mathrm{Fe}}_4{\mathrm{As}}_4$ with other superconducting materials showing that thermal fluctuations of vortices are not as prevalent as in the high-temperature superconducting cuprates, yet they still noticeably influence the properties of the vortex matter.

arXiv comment9 pages, 7 figures, submitted to Phys. Rev. B

References in corpus (27)

• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Iron-Based Superconductors: current status of materials and pairing mechanism
• The Ginzburg-Landau Theory of Type II superconductors in magnetic field
• Significant enhancement of upper critical fields by doping and strain in Fe-based superconductors
• Superconductivity and Ferromagnetism in Hole-Doped RbEuFe${}_4$As${}_4$
• First-Order Vortex Lattice Melting and Magnetization of YBa${}_2$Cu${}_3$O$_{7-δ}
• Membrane-based nanocalorimeter for high-resolution measurements of low-temperature specific heat
• Thermodynamic origin of the peak effect in the superconductor Nb3Sn
• Universal Phase Diagram for Vortex States of Layered Superconductors in Strong Magnetic Fields
• Anisotropic superconductivity and magnetism in single-crystal RbEuFe${}_4$As${}_4$
• Melting of the vortex lattice in high $T_c$ superconductors
• Numerical study of vortex matter using the Bose model: First-order melting and entanglement
• Superconducting and magnetic phase diagram of RbEuFe4As4 and CsEuFe4As4 at high pressure
• Superconducting fluctuations in the reversible magnetization of the iron-pnictide $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Thermal fluctuations and vortex melting in the classical superconductor Nb3Sn from high-resolution specific-heat measurements
• Unique interplay between superconducting and ferromagnetic orders in EuRbFe${}_4$As${}_4$
• Real-space vortex glass imaging and the vortex phase diagram of SnMo6S8
• Interplay of Anisotropy and Disorder in the Doping-Dependent Melting and Glass Transitions of Vortices in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Observation of anisotropic diamagnetism above the superconducting transition in iron-pnictide Ba_(1-x)K_xFe2As2 single crystals due to thermodynamic fluctuations
• Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe${}_4$As${}_4$
• Supercooled vortex liquid and quantitative theory of melting of the flux line lattice in type II superconductors
• Thermodynamic Observation of a Vortex Melting Transition in the Fe-based Superconductor Ba0.5K0.5Fe2As2
• Superconducting fluctuations in isovalently-substituted BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$: Possible observation of multiband effects
• Universal properties for linelike melting of the vortex lattice
• Phase Transitions in a Model Anisotropic High Tc Superconductor

Cited by in corpus (12)

• Trapped magnetic flux in hydrogen-rich high-temperature superconductors
• Field-induced tuning of the pairing state in a superconductor
• Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe
• Topological magnetic order and superconductivity in EuRbFe${}_4$As${}_4$
• Hydrogen in superconductors
• Magnetic and superconducting anisotropy in Ni-doped RbEuFe${}_4$As${}_4$ single crystals
• Fluctuation Conductivity and Vortex State in Superconductor with Strong Paramagnetic Pair Breaking
• Vortex Lattice Melting Line in Superconductors with Paramagnetic Pair-Breaking
• Enhancement of vortex liquid phase and reentrant behavior in NiBi3 single crystals
• Dimensionality of the superconductivity in the transition metal pnictide WP
• Nonpertubative Many-Body Theory for the Two-Dimensional Hubbard Model at Low Temperature: From Weak to Strong Coupling Regimes
• Designing high-performance superconductors with nanoparticle inclusions: comparisons to strong pinning theory