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Title: Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields

Abstract

The recent synthesis of the superconductor LaFeAsO{sub 0.89}F{sub 0.11} with transition temperature T{sub c} {approx} 26 K (refs 1-4) has been quickly followed by reports of even higher transition temperatures in related compounds: 41 K in CeFeAsO{sub 0.84}F{sub 0.16} (ref. 5), 43 K in SmFeAsO{sub 0.9}F{sub 0.1} (ref. 6), and 52 K in NdFeAsO{sub 0.89}F{sub 0.11} and PrFeAsO{sub 0.89}F{sub 0.11}. These discoveries have generated much interest in the mechanisms and manifestations of unconventional superconductivity in the family of doped quaternary layered oxypnictides LnOTMPn (Ln: La, Pr, Ce, Sm; TM: Mn, Fe, Co, Ni; Pn: P, As), because many features of these materials set them apart from other known superconductors. Here we report resistance measurements of LaFeAsO{sub 0.89}F{sub 0.11} at high magnetic fields, up to 45 T, that show a remarkable enhancement of the upper critical field B{sub c2} compared to values expected from the slopes dB{sub c2}/dT 2 T K{sup -1} near T{sub c}, particularly at low temperatures where the deduced B{sub c2}(0) 63-65 T exceeds the paramagnetic limit. We argue that oxypnictides represent a new class of high-field superconductors with B{sub c2} values surpassing those of Nb{sub 3}Sn, MgB{sub 2} and the Chevrel phases, and perhaps exceeding the 100more » T magnetic field benchmark of the high-T{sub c} copper oxides.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Florida State University
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
965832
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Nature
Additional Journal Information:
Journal Volume: 453; Journal Issue: 7197
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; IRON OXIDES; ARSENIC OXIDES; ARSENIC FLUORIDES; IRON FLUORIDES; LANTHANUM FLUORIDES; SUPERCONDUCTIVITY; TRANSITION TEMPERATURE; ELECTRIC CONDUCTIVITY

Citation Formats

Hunte, F., Jaroszynski, J., Gurevich, A., Larbalestier, D. C., Jin, Rongying, Safa-Sefat, Athena, McGuire, Michael A, Sales, Brian C, Christen, David K, and Mandrus, David. Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields. United States: N. p., 2008. Web. doi:10.1038/nature07058.
Hunte, F., Jaroszynski, J., Gurevich, A., Larbalestier, D. C., Jin, Rongying, Safa-Sefat, Athena, McGuire, Michael A, Sales, Brian C, Christen, David K, & Mandrus, David. Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields. United States. https://doi.org/10.1038/nature07058
Hunte, F., Jaroszynski, J., Gurevich, A., Larbalestier, D. C., Jin, Rongying, Safa-Sefat, Athena, McGuire, Michael A, Sales, Brian C, Christen, David K, and Mandrus, David. Tue . "Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields". United States. https://doi.org/10.1038/nature07058.
@article{osti_965832,
title = {Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields},
author = {Hunte, F. and Jaroszynski, J. and Gurevich, A. and Larbalestier, D. C. and Jin, Rongying and Safa-Sefat, Athena and McGuire, Michael A and Sales, Brian C and Christen, David K and Mandrus, David},
abstractNote = {The recent synthesis of the superconductor LaFeAsO{sub 0.89}F{sub 0.11} with transition temperature T{sub c} {approx} 26 K (refs 1-4) has been quickly followed by reports of even higher transition temperatures in related compounds: 41 K in CeFeAsO{sub 0.84}F{sub 0.16} (ref. 5), 43 K in SmFeAsO{sub 0.9}F{sub 0.1} (ref. 6), and 52 K in NdFeAsO{sub 0.89}F{sub 0.11} and PrFeAsO{sub 0.89}F{sub 0.11}. These discoveries have generated much interest in the mechanisms and manifestations of unconventional superconductivity in the family of doped quaternary layered oxypnictides LnOTMPn (Ln: La, Pr, Ce, Sm; TM: Mn, Fe, Co, Ni; Pn: P, As), because many features of these materials set them apart from other known superconductors. Here we report resistance measurements of LaFeAsO{sub 0.89}F{sub 0.11} at high magnetic fields, up to 45 T, that show a remarkable enhancement of the upper critical field B{sub c2} compared to values expected from the slopes dB{sub c2}/dT 2 T K{sup -1} near T{sub c}, particularly at low temperatures where the deduced B{sub c2}(0) 63-65 T exceeds the paramagnetic limit. We argue that oxypnictides represent a new class of high-field superconductors with B{sub c2} values surpassing those of Nb{sub 3}Sn, MgB{sub 2} and the Chevrel phases, and perhaps exceeding the 100 T magnetic field benchmark of the high-T{sub c} copper oxides.},
doi = {10.1038/nature07058},
url = {https://www.osti.gov/biblio/965832}, journal = {Nature},
number = 7197,
volume = 453,
place = {United States},
year = {2008},
month = {1}
}