Nano-scale thin film investigations with slow polarized muons

Morenzoni, E.; Prokscha, T.; Suter, A.; Luetkens, H.; Khasanov, R.

doi:10.1088/0953-8984/16/40/010

Cited by 96 publications

(90 citation statements)

References 64 publications

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“…Interestingly, the development of variable-energy slow-μ + beams [17] has recently enabled μ + SR to profile penetration of weak magnetic fields at the surface of YBa 2 Cu 3 O 6.92 (state-of-the-art high quality crystals) [18]. It was found that a dead surface layer (about 10% of λ) was needed to model λ with Meissner-state theory (similar anomalies were found in previous studies [19,20]). These low-energy μ + SR profiling results indicate that interpretation of surface-specific measurements of λ is less direct than presumed (as discussed further in section 5.4), making the understanding of bulk μ + SR measurements of λ all that more imperative.…”

Section: Introductionsupporting

confidence: 55%

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Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Harshman¹,

Fiory²

2011

J. Phys.: Condens. Matter

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Muon spin rotation (μ + SR) measurements of square-root second moments of local magnetic fields σ in superconducting mixed states, as published for oriented crystals and powder samples of YBa 2 Cu 3 O 7-δ (  0.05), YBa 2 Cu 4 O 8 and La 2x Sr x CuO 4 (x ~ 0.15-0.17), are subjected to comparative analysis for superconducting gap symmetry. For oriented crystals it is shown that anomalous dependences of σ on temperature T and applied field H, as-measured and extracted a-and b-axial components, are attributable to fluxon depinning and disorder that obscure the intrinsic character of the superconducting penetration depth. Random averages derived from oriented-crystal data differ markedly from corresponding non-oriented powders, owing to weaker influence of pinning in high-quality crystals. Related indicators for pinning perturbations such as non-monotonic H dependence of σ, irreproducible data and strong H dependence of apparent transition temperatures are also evident. Strong intrinsic pinning suppresses thermal anomalies in c-axis components of σ, which reflect nodeless gap symmetries in YBa 2 Cu 3 O 7-δ and YBa 2 Cu 4 O 8 . For YBa 2 Cu 3 O 7-δ , the crystal (a-b components, corrected for depinning) and powder data all reflect a nodeless gap (however, a-b symmetries remain unresolved for crystalline YBa 2 Cu 4 O 8 and La 1.83 Sr 0.17 CuO 4 ). Inconsistencies contained in multiple and noded gap interpretations of crystal data, and observed differences between bulk μ + SR and surface-sensitive measurements are discussed.

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Section: Introductionsupporting

confidence: 55%

“…The low-energy  + SR method is particularly suited for obtaining detailed depth profiles of static magnetic flux penetration in weak applied magnetic fields [18][19][20]. Shown in figure 8 figure 3), respectively, in [18].…”

Section: Magnetic Field Penetration At Superconductor Surfacesmentioning

confidence: 99%

Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Harshman¹,

Fiory²

2011

J. Phys.: Condens. Matter

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“…The appearance of Polarized Neutron Reflectometry (PNR) 14,15 and Low-Energy Muon Spin Rotation spectroscopy (LE-µSR) 16,17 techniques qualitatively changed the landscape of studies of surface magnetization. In particular, these techniques enable direct measurements of B(z).…”

Section: Introductionmentioning

confidence: 99%

Nonlocal effect and dimensions of Cooper pairs measured by low-energy muons and polarized neutrons in type-I superconductors

et al. 2013

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The Pippard coherence length ξ0 (the size of a Cooper pair) in two extreme type-I superconductors (In and Sn) was determined directly through high-resolution measurement of the nonlocal electrodynamic effect combining low-energy muon spin rotation spectroscopy and polarized neutron reflectometry. The renormalization factor Z ≡ m * cp /2m (m * cp and m are the mass of the Cooper pair and the electron, respectively) resulting from the electron-phonon interaction, and the temperature dependent London penetration depth λL(T ) were determined as well. An expression linking ξ0, Z and λL(0) is introduced and experimentally verified. This expression allows one to determine experimentally the Pippard coherence length in any superconductor, independent of whether the superconductor is local or nonlocal, conventional or unconventional.

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“…More details on μSR techniques, in general, and LE-μSR, in particular, can be found in Refs. [17][18][19].…”

Section: Methodsmentioning

confidence: 99%

Spin-phonon coupling in epitaxialSr0.6Ba0.4MnO3thin films

et al. 2017

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Spin-phonon coupling is investigated in epitaxially strained Sr 1−x Ba x MnO 3 thin films with perovskite structure by means of microwave (MW) and infrared (IR) spectroscopy. In this work we focus on the Sr 0.6 Ba 0.4 MnO 3 composition grown on (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 substrate. The MW complex electromagnetic response shows a decrease in the real part and a clear anomaly in the imaginary part around 150 K. Moreover, it coincides with a 17% hardening of the lowest-frequency polar phonon seen in IR reflectance spectra. In order to further elucidate this phenomenon, low-energy muon-spin spectroscopy was carried out, signaling the emergence of antiferromagnetic order with Néel temperature (T N ) around 150 K. Thus, our results confirm that epitaxial Sr 0.6 Ba 0.4 MnO 3 thin films display strong spin-phonon coupling below T N , which may stimulate further research on tuning the magnetoelectric coupling by controlling the epitaxial strain and chemical pressure in the Sr 1−x Ba x MnO 3 system.

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Nano-scale thin film investigations with slow polarized muons

Cited by 96 publications

References 64 publications

Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Nonlocal effect and dimensions of Cooper pairs measured by low-energy muons and polarized neutrons in type-I superconductors

Spin-phonon coupling in epitaxialSr0.6Ba0.4MnO3thin films

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Nano-scale thin film investigations with slow polarized muons

Cited by 96 publications

References 64 publications

Concerning the superconducting gap symmetry in YBa2Cu3O7 − δ, YBa2Cu4O8, and La2 −xSrxCuO4determined from muon spin rotation in mixed states of crystals and powders

Concerning the superconducting gap symmetry in YBa2Cu3O7 − δ, YBa2Cu4O8, and La2 −xSrxCuO4determined from muon spin rotation in mixed states of crystals and powders

Nonlocal effect and dimensions of Cooper pairs measured by low-energy muons and polarized neutrons in type-I superconductors

Spin-phonon coupling in epitaxialSr0.6Ba0.4MnO3thin films

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Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders