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

F. Hunte; J. Jaroszynski; A. Gurevich; D. C. Larbalestier; R. Jin; A. S. Sefat; M. A. McGuire; B. C. Sales; D. K. Christen; D. Mandrus

doi:10.1038/nature07058

Two-band superconductivity in LaFeAsO_0.89F_0.11 at very high magnetic fields

F. Hunte, J. Jaroszynski, A. Gurevich, D. C. Larbalestier, R. Jin, A. S. Sefat, M. A. McGuire, B. C. Sales, D. K. Christen, D. Mandrus

Correlated Electron Materials

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Abstract

The recent synthesis of the superconductor LaFeAsO_0.89F _0.11 with transition temperature T_c ≈ 26 K (refs 1-4) has been quickly followed by reports of even higher transition temperatures in related compounds: 41 K in CeFeAsO_0.84F_0.16 (ref. 5), 43 K in SmFeAsO_0.9F_0.1 (ref. 6), and 52 K in NdFeAsO _0.89F_0.11 and PrFeAsO_0.89F_0.11 (refs 7, 8). 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 _0.89F_0.11 at high magnetic fields, up to 45 T, that show a remarkable enhancement of the upper critical field B_c2 compared to values expected from the slopes dB_c2/dT ≈ 2 T K^-1 near T_c, particularly at low temperatures where the deduced B _c2(0) ≈ 63-65 T exceeds the paramagnetic limit. We argue that oxypnictides represent a new class of high-field superconductors with B _c2 values surpassing those of Nb₃Sn, MgB₂ and the Chevrel phases, and perhaps exceeding the 100 T magnetic field benchmark of the high-T_c copper oxides.

Original language	English
Pages (from-to)	903-905
Number of pages	3
Journal	Nature
Volume	453
Issue number	7197
DOIs	https://doi.org/10.1038/nature07058
State	Published - Jun 12 2008

Funding

Acknowledgements Work at the NHMFL was supported by IHRP under NSF Cooperative Agreement, by the State of Florida, by the DOE, by the NSF Focused Research Group on Magnesium Diboride (FRG), and by AFOSR. Work at ORNL was supported by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences. We are grateful for discussions with G. Boebinger, E. Hellstrom, P. Lee, J. Jiang, and C. Tarantini at the NHMFL.

Funders	Funder number
IHRP
Office of Basic Energy Sciences
National Science Foundation
U.S. Department of Energy
Air Force Office of Scientific Research
Division of Materials Sciences and Engineering

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title = "Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields",

abstract = "The recent synthesis of the superconductor LaFeAsO0.89F 0.11 with transition temperature Tc ≈ 26 K (refs 1-4) has been quickly followed by reports of even higher transition temperatures in related compounds: 41 K in CeFeAsO0.84F0.16 (ref. 5), 43 K in SmFeAsO0.9F0.1 (ref. 6), and 52 K in NdFeAsO 0.89F0.11 and PrFeAsO0.89F0.11 (refs 7, 8). 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 0.89F0.11 at high magnetic fields, up to 45 T, that show a remarkable enhancement of the upper critical field Bc2 compared to values expected from the slopes dBc2/dT ≈ 2 T K-1 near Tc, particularly at low temperatures where the deduced B c2(0) ≈ 63-65 T exceeds the paramagnetic limit. We argue that oxypnictides represent a new class of high-field superconductors with B c2 values surpassing those of Nb3Sn, MgB2 and the Chevrel phases, and perhaps exceeding the 100 T magnetic field benchmark of the high-Tc copper oxides.",

author = "F. Hunte and J. Jaroszynski and A. Gurevich and Larbalestier, {D. C.} and R. Jin and Sefat, {A. S.} and McGuire, {M. A.} and Sales, {B. C.} and Christen, {D. K.} and D. Mandrus",

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AU - Hunte, F.

AU - Jaroszynski, J.

AU - Gurevich, A.

AU - Larbalestier, D. C.

AU - Jin, R.

AU - Sefat, A. S.

AU - McGuire, M. A.

AU - Sales, B. C.

AU - Christen, D. K.

AU - Mandrus, D.

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N2 - The recent synthesis of the superconductor LaFeAsO0.89F 0.11 with transition temperature Tc ≈ 26 K (refs 1-4) has been quickly followed by reports of even higher transition temperatures in related compounds: 41 K in CeFeAsO0.84F0.16 (ref. 5), 43 K in SmFeAsO0.9F0.1 (ref. 6), and 52 K in NdFeAsO 0.89F0.11 and PrFeAsO0.89F0.11 (refs 7, 8). 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 0.89F0.11 at high magnetic fields, up to 45 T, that show a remarkable enhancement of the upper critical field Bc2 compared to values expected from the slopes dBc2/dT ≈ 2 T K-1 near Tc, particularly at low temperatures where the deduced B c2(0) ≈ 63-65 T exceeds the paramagnetic limit. We argue that oxypnictides represent a new class of high-field superconductors with B c2 values surpassing those of Nb3Sn, MgB2 and the Chevrel phases, and perhaps exceeding the 100 T magnetic field benchmark of the high-Tc copper oxides.

AB - The recent synthesis of the superconductor LaFeAsO0.89F 0.11 with transition temperature Tc ≈ 26 K (refs 1-4) has been quickly followed by reports of even higher transition temperatures in related compounds: 41 K in CeFeAsO0.84F0.16 (ref. 5), 43 K in SmFeAsO0.9F0.1 (ref. 6), and 52 K in NdFeAsO 0.89F0.11 and PrFeAsO0.89F0.11 (refs 7, 8). 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 0.89F0.11 at high magnetic fields, up to 45 T, that show a remarkable enhancement of the upper critical field Bc2 compared to values expected from the slopes dBc2/dT ≈ 2 T K-1 near Tc, particularly at low temperatures where the deduced B c2(0) ≈ 63-65 T exceeds the paramagnetic limit. We argue that oxypnictides represent a new class of high-field superconductors with B c2 values surpassing those of Nb3Sn, MgB2 and the Chevrel phases, and perhaps exceeding the 100 T magnetic field benchmark of the high-Tc copper oxides.

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Two-band superconductivity in LaFeAsO_0.89F_0.11 at very high magnetic fields

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