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Title: The impact of Maki parameter and spin orbit scattering constant in the WHH model on upper critical magnetic fields in Ni-and co-doped pnictide bulk superconductors

Abstract

Werthamer, Helfand, and Hohenberg (WHH) model is applied to the measured upper critical magnetic fields of Ni-and Co-doped pnictide bulk superconductors. This approach incorporates both orbital and paramagnetic effects in the upper critical field’s temperature dependence. Additionally, the relative importance of both the orbital and paramagnetic effects in the suppression of the superconductivity is described by the Maki parameter. In most superconductors, the Maki parameter is usually much less than unity suggesting that the influence of the paramagnetic effect is small. However, in materials with heavy electron effective mass, in which the Fermi energy is small, or in layered materials in a magnetic field parallel to the layers, the Maki parameter can be larger than unity. This is the case for our bulk pnictides. By fitting the measured temperature dependence of the upper critical field, we derive the Maki parameter and the spin orbit scattering constant and examine the correlation between the Maki parameter, the spin orbit scattering constant, and the reduced upper critical field for our curve fits vs. temperature. In conclusion, the obtained Maki parameters indicate that the Zeeman pair breaking dominates over the orbital pair breaking and spin-paramagnetic pair-breaking effect is significant. At the same time, ourmore » spin orbit scattering constants indicate that spin-orbit scattering needs to be also included in description of the H c2(T) data in these materials.« less

Authors:
 [1];  [1]; ORCiD logo [2];  [3];  [3];  [3]
  1. Saint Louis Univ., MO (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1565848
Report Number(s):
[LA-UR-17-28058]
[Journal ID: ISSN 0094-243X]
Grant/Contract Number:  
[89233218CNA000001]
Resource Type:
Accepted Manuscript
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
[ Journal Volume: 1895; Conference: APPLICATION OF MATHEMATICS IN TECHNICAL AND NATURAL SCIENCES, Albena (Bulgaria), 21-26 Jun 2017]; Journal ID: ISSN 0094-243X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High Magnetic Field Science; Maki parameter; pnictide superconductors

Citation Formats

Solenov, Dmitry, Nikolo, Martin, Singleton, John, Jiang, Jianyi, Weiss, Jeremy, and Hellstrom, Eric. The impact of Maki parameter and spin orbit scattering constant in the WHH model on upper critical magnetic fields in Ni-and co-doped pnictide bulk superconductors. United States: N. p., 2017. Web. doi:10.1063/1.5007389.
Solenov, Dmitry, Nikolo, Martin, Singleton, John, Jiang, Jianyi, Weiss, Jeremy, & Hellstrom, Eric. The impact of Maki parameter and spin orbit scattering constant in the WHH model on upper critical magnetic fields in Ni-and co-doped pnictide bulk superconductors. United States. doi:10.1063/1.5007389.
Solenov, Dmitry, Nikolo, Martin, Singleton, John, Jiang, Jianyi, Weiss, Jeremy, and Hellstrom, Eric. Thu . "The impact of Maki parameter and spin orbit scattering constant in the WHH model on upper critical magnetic fields in Ni-and co-doped pnictide bulk superconductors". United States. doi:10.1063/1.5007389. https://www.osti.gov/servlets/purl/1565848.
@article{osti_1565848,
title = {The impact of Maki parameter and spin orbit scattering constant in the WHH model on upper critical magnetic fields in Ni-and co-doped pnictide bulk superconductors},
author = {Solenov, Dmitry and Nikolo, Martin and Singleton, John and Jiang, Jianyi and Weiss, Jeremy and Hellstrom, Eric},
abstractNote = {Werthamer, Helfand, and Hohenberg (WHH) model is applied to the measured upper critical magnetic fields of Ni-and Co-doped pnictide bulk superconductors. This approach incorporates both orbital and paramagnetic effects in the upper critical field’s temperature dependence. Additionally, the relative importance of both the orbital and paramagnetic effects in the suppression of the superconductivity is described by the Maki parameter. In most superconductors, the Maki parameter is usually much less than unity suggesting that the influence of the paramagnetic effect is small. However, in materials with heavy electron effective mass, in which the Fermi energy is small, or in layered materials in a magnetic field parallel to the layers, the Maki parameter can be larger than unity. This is the case for our bulk pnictides. By fitting the measured temperature dependence of the upper critical field, we derive the Maki parameter and the spin orbit scattering constant and examine the correlation between the Maki parameter, the spin orbit scattering constant, and the reduced upper critical field for our curve fits vs. temperature. In conclusion, the obtained Maki parameters indicate that the Zeeman pair breaking dominates over the orbital pair breaking and spin-paramagnetic pair-breaking effect is significant. At the same time, our spin orbit scattering constants indicate that spin-orbit scattering needs to be also included in description of the Hc2(T) data in these materials.},
doi = {10.1063/1.5007389},
journal = {AIP Conference Proceedings},
number = ,
volume = [1895],
place = {United States},
year = {2017},
month = {10}
}

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