Superconducting state coexisting with a phase-separated static magnetic order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>Ba</mml:mtext><mml:mo>,</mml:mo><mml:mtext>K</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>Sr</mml:mtext><mml:mo>,</mml:mo><mml:mtext>Na</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CaFe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
T. Goko(Columbia University), A. A. Aczel(McMaster University), E. Baggio‐Saitovitch(Centro Brasileiro de Pesquisas Físicas), Sergey L. Bud’ko(Iowa State University), P. C. Canfield(Iowa State University), J. P. Carlo(Columbia University), Genfu Chen(Institute of Physics), Pengcheng Dai(University of Tennessee at Knoxville), Andreas Hamann(FZI Research Center for Information Technology), W. Z. Hu(Institute of Physics), Hiroshi Kageyama(Kyoto University), G. M. Luke(McMaster University), J. L. Luo(Institute of Physics), B. Nachumi(Columbia University), Ni Ni(Ames National Laboratory), D. Reznik(FZI Research Center for Information Technology), D. R. Sanchez-Candela(Centro Brasileiro de Pesquisas Físicas), A. T. Savici(Johns Hopkins University), Kenneth Sikes(Columbia University), N. L. Wang(Chinese Academy of Sciences), C. R. Wiebe(Florida State University), T. J. Williams(McMaster University), Takafumi Yamamoto(Kyoto University), Weiqiang Yu(McMaster University), Yohei Uemura(Columbia University)
Cited by 134Open Access
Abstract
By muon spin-relaxation measurements on single-crystal specimens, we show that superconductivity in the $A{\text{Fe}}_{2}{\text{As}}_{2}$ $(A=\text{Ca},\text{Ba},\text{Sr})$ systems, in both the cases of composition and pressure tunings, coexists with a strong static magnetic order in a partial volume fraction. The superfluid response from the remaining paramagnetic volume fraction of $({\text{Ba}}_{0.5}{\text{K}}_{0.5}){\text{Fe}}_{2}{\text{As}}_{2}$ exhibits a nearly linear variation in $T$ at low temperatures, suggesting an anisotropic energy gap with line nodes and/or multigap effects.
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