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Kaneko UF, Piva MM, Jesus CBR, Saleta ME, Urbano RR, Pagliuso PG, Granado E. Evidence of precursor orthorhombic domains well above the electronic nematic transition temperature in Sr(Fe 1-x Co x ) 2As 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:495402. [PMID: 31284273 DOI: 10.1088/1361-648x/ab2ffc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Raman scattering, synchrotron x-ray diffraction, specific heat, resistivity and magnetic susceptibility measurements were performed in Sr(Fe1-x Co x )2As2 [[Formula: see text]] single crystals with superconducting critical temperature [Formula: see text] K and two additional transitions at 132 and 152 K observed in both specific heat and resistivity data. A quasielastic Raman signal with B 2g symmetry (tetragonal cell) associated with electronic nematic fluctuations is observed. Crucially, this signal shows maximum intensity at [Formula: see text] K, marking the nematic transition temperature. X-ray diffraction shows evidence of coexisting orthorhombic and tetragonal domains between [Formula: see text] and [Formula: see text] ∼ 152 K, implying that precursor orthorhombic domains emerge over an extended temperature range above [Formula: see text]. While the height of the quasielastic Raman peak is insensitive to [Formula: see text], the temperature-dependence of the average nematic fluctuation rate indicates a slowing down of the nematic fluctuations inside the precursor orthorhombic domains. These results are analogous to those previously reported for the LaFeAsO parent oxypnictide (Kaneko et al 2017 Phys. Rev. B 96 014506). We propose a scenario where the precursor orthorhombic phase may be generated within the electronically disordered regime ([Formula: see text]) as long as the nematic fluctuation rate is sufficiently small in comparison to the optical phonon frequency range. In this regime, the local atomic structure responds adiabatically to the electronic nematic fluctuations, creating a net of orthorhombic clusters that, albeit dynamical for [Formula: see text], may be sufficiently dense to sustain long-range phase coherence in a diffraction process up to [Formula: see text].
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Affiliation(s)
- U F Kaneko
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, São Paulo 13083-100, Brazil
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Eilers F, Grube K, Zocco DA, Wolf T, Merz M, Schweiss P, Heid R, Eder R, Yu R, Zhu JX, Si Q, Shibauchi T, Löhneysen HV. Strain-Driven Approach to Quantum Criticality in AFe_{2}As_{2} with A=K, Rb, and Cs. PHYSICAL REVIEW LETTERS 2016; 116:237003. [PMID: 27341252 DOI: 10.1103/physrevlett.116.237003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Indexed: 06/06/2023]
Abstract
The iron-based superconductors AFe_{2}As_{2} with A=K, Rb, Cs exhibit large Sommerfeld coefficients approaching those of heavy-fermion systems. We have investigated the magnetostriction and thermal expansion of this series to shed light on this unusual behavior. Quantum oscillations of the magnetostriction allow identifying the band-specific quasiparticle masses which by far exceed the band-structure derived masses. The divergence of the Grüneisen ratio derived from thermal expansion indicates that with increasing volume along the series a quantum critical point is approached. The critical fluctuations responsible for the enhancement of the quasiparticle masses appear to weaken the superconducting state.
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Affiliation(s)
- Felix Eilers
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
| | - Kai Grube
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
| | - Diego A Zocco
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
| | - Thomas Wolf
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
| | - Michael Merz
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
| | - Peter Schweiss
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
| | - Rolf Heid
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
| | - Robert Eder
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
| | - Rong Yu
- Department of Physics, Renmin University of China, Beijing 100872, China
| | - Jian-Xin Zhu
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Qimiao Si
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
| | - Takasada Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hilbert V Löhneysen
- Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany
- Physikalisches Institut, Karlsruher Institut für Technologie, 76049 Karlsruhe, Germany
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Rosa PFS, Adriano C, Garitezi TM, Piva MM, Mydeen K, Grant T, Fisk Z, Nicklas M, Urbano RR, Fernandes RM, Pagliuso PG. Possible unconventional superconductivity in substituted BaFe2As2 revealed by magnetic pair-breaking studies. Sci Rep 2014; 4:6252. [PMID: 25176407 PMCID: PMC4150111 DOI: 10.1038/srep06252] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 07/15/2014] [Indexed: 11/28/2022] Open
Abstract
The possible existence of a sign-changing gap symmetry in BaFe2As2-derived superconductors (SC) has been an exciting topic of research in the last few years. To further investigate this subject we combine Electron Spin Resonance (ESR) and pressure-dependent transport measurements to investigate magnetic pair-breaking effects on BaFe1.9M0.1As2 (M = Mn, Co, Cu, and Ni) single crystals. An ESR signal, indicative of the presence of localized magnetic moments, is observed only for M = Cu and Mn compounds, which display very low SC transition temperature (Tc) and no SC, respectively. From the ESR analysis assuming the absence of bottleneck effects, the microscopic parameters are extracted to show that this reduction of Tc cannot be accounted by the Abrikosov-Gorkov pair-breaking expression for a sign-preserving gap function. Our results reveal an unconventional spin- and pressure-dependent pair-breaking effect and impose strong constraints on the pairing symmetry of these materials.
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Affiliation(s)
- P F S Rosa
- 1] Instituto de Física "Gleb Wataghin", UNICAMP, Campinas-SP, 13083-859, Brazil [2] University of California, Irvine, California 92697-4574, USA
| | - C Adriano
- Instituto de Física "Gleb Wataghin", UNICAMP, Campinas-SP, 13083-859, Brazil
| | - T M Garitezi
- Instituto de Física "Gleb Wataghin", UNICAMP, Campinas-SP, 13083-859, Brazil
| | - M M Piva
- 1] Instituto de Física "Gleb Wataghin", UNICAMP, Campinas-SP, 13083-859, Brazil [2] Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
| | - K Mydeen
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
| | - T Grant
- University of California, Irvine, California 92697-4574, USA
| | - Z Fisk
- University of California, Irvine, California 92697-4574, USA
| | - M Nicklas
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
| | - R R Urbano
- Instituto de Física "Gleb Wataghin", UNICAMP, Campinas-SP, 13083-859, Brazil
| | - R M Fernandes
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
| | - P G Pagliuso
- Instituto de Física "Gleb Wataghin", UNICAMP, Campinas-SP, 13083-859, Brazil
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