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Title: Non-conventional superconducting fluctuations in Ba(Fe 1-xRh x) 2As 2 iron-based superconductors

Abstract

We measured the static uniform spin susceptibility of Ba(Fe 1-xRh x) 2As 2 iron-based superconductors, over a broad range of doping (0.041x0.094) and magnetic fields. At small fields (H ≤ 1 kOe) we observed, above the transition temperature T c, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg–Landau theory. On the contrary, our data agree with a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-Tc cuprate superconductors. Additionally, in the presence of strong fields, the unconventional fluctuating diamagnetism is suppressed, whereas Ginzburg–Landau fluctuations are found, in agreement with literature.

Authors:
 [1];  [2];  [3];  [4]
  1. Univ. of Pavia (Italy)
  2. Univ. of Parma (Italy)
  3. Ames Lab., Ames, IA (United States)
  4. Univ. degli Studi di Milano (Italy)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1166912
Report Number(s):
IS-J 8505
Journal ID: ISSN 0953-8984
DOE Contract Number:  
AC02-07CH11358
Resource Type:
Journal Article
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 26; Journal Issue: 40; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; superconductivity; iron-based superconductors; superconducting fluctuations

Citation Formats

Bossoni, L., Romano, L., Canfield, Paul C., and Lascialfari, A. Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)2As2 iron-based superconductors. United States: N. p., 2014. Web. doi:10.1088/0953-8984/26/40/405703.
Bossoni, L., Romano, L., Canfield, Paul C., & Lascialfari, A. Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)2As2 iron-based superconductors. United States. doi:10.1088/0953-8984/26/40/405703.
Bossoni, L., Romano, L., Canfield, Paul C., and Lascialfari, A. Wed . "Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)2As2 iron-based superconductors". United States. doi:10.1088/0953-8984/26/40/405703.
@article{osti_1166912,
title = {Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)2As2 iron-based superconductors},
author = {Bossoni, L. and Romano, L. and Canfield, Paul C. and Lascialfari, A.},
abstractNote = {We measured the static uniform spin susceptibility of Ba(Fe1-xRhx)2As2 iron-based superconductors, over a broad range of doping (0.041x0.094) and magnetic fields. At small fields (H ≤ 1 kOe) we observed, above the transition temperature Tc, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg–Landau theory. On the contrary, our data agree with a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-Tc cuprate superconductors. Additionally, in the presence of strong fields, the unconventional fluctuating diamagnetism is suppressed, whereas Ginzburg–Landau fluctuations are found, in agreement with literature.},
doi = {10.1088/0953-8984/26/40/405703},
journal = {Journal of Physics. Condensed Matter},
issn = {0953-8984},
number = 40,
volume = 26,
place = {United States},
year = {2014},
month = {9}
}