Melting of vortex lattice in the magnetic superconductor RbEuFe4As4

被引：20
作者：
Koshelev, A. E. [1 ]
Willa, K. [1 ,2 ]
Willa, R. [1 ,3 ]
Smylie, M. P. [1 ,4 ]
Bao, J-K [1 ]
Chung, D. Y. [1 ]
Kanatzidis, M. G. [1 ,5 ]
Kwok, W-K [1 ]
Welp, U. [1 ]
机构：
[1] Argonne Natl Lab, Mat Sci Div, 9700 South Cass Ave, Lemont, IL 60439 USA
[2] Karlsruhe Inst Technol, Inst Solid State Phys, D-76021 Karlsruhe, Germany
[3] Karlsruhe Inst Technol, Inst Theory Condensed Matter, D-76131 Karlsruhe, Germany
[4] Hofstra Univ, Dept Phys & Astron, Hempstead, NY 11549 USA
[5] Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA
来源：
PHYSICAL REVIEW B | 2019年 / 100卷 / 09期
基金：
瑞士国家科学基金会;
关键词：
UNIVERSAL PHASE-DIAGRAM; SINGLE-CRYSTALS; LATENT-HEAT; TRANSITION; LINE; IRREVERSIBILITY; MATTER;
D O I：
10.1103/PhysRevB.100.094518
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 RbEuFe4As4 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 RbEuFe(4)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.
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页数：8
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