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

doi:https://doi.org/10.1038/nature07058

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

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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 »« less

Authors:

Hunte, F. ^[1]; Jaroszynski, J. ^[1]; Gurevich, A. ^[1]; Larbalestier, D. C. ^[1]; Jin, Rongying ^[2]; Safa-Sefat, Athena ^[2]; McGuire, Michael A ^[2]; Sales, Brian C ^[2]; Christen, David K ^[2]; Mandrus, David ^[2]

Florida State University
ORNL

Publication Date:: 2008-01-01

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.

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                    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

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                    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.

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@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}

}

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