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Title: Melting of vortex lattice in the magnetic superconductor RbEuFe 4 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 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. Lastly, we compare the melting behavior of RbEuFe4As4 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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [3]; ORCiD logo [1];  [1];  [4];  [1];  [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States); Karlsruhe Inst. of Technology, Karlsruhe (Germany)
  3. Argonne National Lab. (ANL), Lemont, IL (United States); Hofstra Univ., Hempstead, NY (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States); Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Swiss National Science Foundation (SNSF); USDOE
OSTI Identifier:
1566150
Alternate Identifier(s):
OSTI ID: 1561400
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Koshelev, A. E., Willa, K., Willa, R., Smylie, M. P., Bao, J. -K., Chung, D. Y., Kanatzidis, M. G., Kwok, W. -K., and Welp, U. Melting of vortex lattice in the magnetic superconductor RbEuFe4As4. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.094518.
Koshelev, A. E., Willa, K., Willa, R., Smylie, M. P., Bao, J. -K., Chung, D. Y., Kanatzidis, M. G., Kwok, W. -K., & Welp, U. Melting of vortex lattice in the magnetic superconductor RbEuFe4As4. United States. doi:10.1103/PhysRevB.100.094518.
Koshelev, A. E., Willa, K., Willa, R., Smylie, M. P., Bao, J. -K., Chung, D. Y., Kanatzidis, M. G., Kwok, W. -K., and Welp, U. Thu . "Melting of vortex lattice in the magnetic superconductor RbEuFe4As4". United States. doi:10.1103/PhysRevB.100.094518. https://www.osti.gov/servlets/purl/1566150.
@article{osti_1566150,
title = {Melting of vortex lattice in the magnetic superconductor RbEuFe4As4},
author = {Koshelev, A. E. and Willa, K. and Willa, R. and Smylie, M. P. and Bao, J. -K. and Chung, D. Y. and Kanatzidis, M. G. and Kwok, W. -K. and Welp, U.},
abstractNote = {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. Lastly, we compare the melting behavior of RbEuFe4As4 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.},
doi = {10.1103/PhysRevB.100.094518},
journal = {Physical Review B},
number = 9,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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