1
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Dehn MH, Shenton JK, Arseneau DJ, MacFarlane WA, Morris GD, Maigné A, Spaldin NA, Kiefl RF. Local Electronic Structure and Dynamics of Muon-Polaron Complexes in Fe_{2}O_{3}. Phys Rev Lett 2021; 126:037202. [PMID: 33543970 DOI: 10.1103/physrevlett.126.037202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 12/04/2020] [Indexed: 06/12/2023]
Abstract
We perform detailed muon spin rotation (μSR) measurements in the classic antiferromagnet Fe_{2}O_{3} and explain the spectra by considering dynamic population and dissociation of charge-neutral muon-polaron complexes. We show that charge-neutral muon states in Fe_{2}O_{3}, despite lacking the signatures typical of charge-neutral muonium centers in nonmagnetic materials, have a significant impact on the measured μSR frequencies and relaxation rates. Our identification of such polaronic muon centers in Fe_{2}O_{3} suggests that isolated hydrogen (H) impurities form analogous complexes, and that H interstitials may be a source of charge carrier density in Fe_{2}O_{3}.
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Affiliation(s)
- M H Dehn
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- triumf, Vancouver, British Columbia V6T 2A3, Canada
| | - J K Shenton
- Department of Materials, ETH Zurich, CH-8093 Zürich, Switzerland
| | - D J Arseneau
- triumf, Vancouver, British Columbia V6T 2A3, Canada
| | - W A MacFarlane
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- triumf, Vancouver, British Columbia V6T 2A3, Canada
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - G D Morris
- triumf, Vancouver, British Columbia V6T 2A3, Canada
| | - A Maigné
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - N A Spaldin
- Department of Materials, ETH Zurich, CH-8093 Zürich, Switzerland
| | - R F Kiefl
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- triumf, Vancouver, British Columbia V6T 2A3, Canada
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2
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Dehn MH, Cao Y, Wang PX, Cottrell SP, MacLachlan MJ, Fleming DG, Kiefl RF. Direct observation of muonium reacting with uncapped gold nanoparticles in porous silica and nature of the final state. J Chem Phys 2020; 152:184706. [PMID: 32414252 DOI: 10.1063/5.0004210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report the reaction of muonium (Mu = [μ+e-]), a light isotopic analog of hydrogen, with uncapped gold nanoparticles embedded in mesoporous silica. Using the radio-frequency muon spin rotation (RF-μSR) technique, we directly observe and characterize the resulting final state on the nanoparticle surface, showing conclusively its diamagnetic nature. The magnetic environment experienced by the reacted muons is only weakly perturbed compared to that of muons in a silica reference, consistent with the surface of the gold nanoparticles being metallic and non-magnetic. We demonstrate the potential of RF-μSR for the investigation of the surface properties of nanoparticles and show the feasibility of Knight shift measurements of muons on metal surfaces.
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Affiliation(s)
- M H Dehn
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Y Cao
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - P-X Wang
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - S P Cottrell
- ISIS Facility, Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxon OX11 0QX, United Kingdom
| | - M J MacLachlan
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - D G Fleming
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - R F Kiefl
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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3
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Chatzichristos A, McFadden RML, Dehn MH, Dunsiger SR, Fujimoto D, Karner VL, McKenzie I, Morris GD, Pearson MR, Stachura M, Sugiyama J, Ticknor JO, MacFarlane WA, Kiefl RF. Bi-Arrhenius Diffusion and Surface Trapping of ^{8}Li^{+} in Rutile TiO_{2}. Phys Rev Lett 2019; 123:095901. [PMID: 31524467 DOI: 10.1103/physrevlett.123.095901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Indexed: 06/10/2023]
Abstract
We report measurements of the diffusion rate of isolated ion-implanted ^{8}Li^{+} within ∼120 nm of the surface of oriented single-crystal rutile TiO_{2} using a radiotracer technique. The α particles from the ^{8}Li decay provide a sensitive monitor of the distance from the surface and how the depth profile of ^{8}Li evolves with time. The main findings are that the implanted Li^{+} diffuses and traps at the (001) surface. The T dependence of the diffusivity is described by a bi-Arrhenius expression with activation energies of 0.3341(21) eV above 200 K, whereas at lower temperatures it has a much smaller barrier of 0.0313(15) eV. We consider possible origins for the surface trapping, as well the nature of the low-T barrier.
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Affiliation(s)
- A Chatzichristos
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - R M L McFadden
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - M H Dehn
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - S R Dunsiger
- Department of Physics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - D Fujimoto
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - V L Karner
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - I McKenzie
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - G D Morris
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
| | - M R Pearson
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
| | - M Stachura
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
| | - J Sugiyama
- Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
- CROSS Neutron Science and Technology Center, 162-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan
| | - J O Ticknor
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - W A MacFarlane
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
| | - R F Kiefl
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
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4
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Dehn MH, Arseneau DJ, Böni P, Bridges MD, Buck T, Cortie DL, Fleming DG, Kelly JA, MacFarlane WA, MacLachlan MJ, McFadden RML, Morris GD, Wang PX, Xiao J, Zamarion VM, Kiefl RF. Communication: Chemisorption of muonium on gold nanoparticles: A sensitive new probe of surface magnetism and reactivity. J Chem Phys 2016; 145:181102. [DOI: 10.1063/1.4967460] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M. H. Dehn
- Physik-Department, Technische Universität München, James-Franck-Strasse 1, 85748 Garching bei München, Germany
| | - D. J. Arseneau
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - P. Böni
- Physik-Department, Technische Universität München, James-Franck-Strasse 1, 85748 Garching bei München, Germany
| | - M. D. Bridges
- Jules Stein Eye Institute, 100 Stein Plaza UCLA, Los Angeles, California 90095, USA
| | - T. Buck
- Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6T 1Z1, Canada
| | - D. L. Cortie
- Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6T 1Z1, Canada
| | - D. G. Fleming
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - J. A. Kelly
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - W. A. MacFarlane
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - M. J. MacLachlan
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - R. M. L. McFadden
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - G. D. Morris
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - P.-X. Wang
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - J. Xiao
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - V. M. Zamarion
- Institute of Chemistry, University of Sao Paulo, Avenida Professor Lineu Prestes 748, Sao Paulo, CEP 05508-000, Brazil
| | - R. F. Kiefl
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6T 1Z1, Canada
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5
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Cortie DL, Buck T, Dehn MH, Karner VL, Kiefl RF, Levy CDP, McFadden RML, Morris GD, McKenzie I, Pearson MR, Wang XL, MacFarlane WA. β-NMR Investigation of the Depth-Dependent Magnetic Properties of an Antiferromagnetic Surface. Phys Rev Lett 2016; 116:106103. [PMID: 27015494 DOI: 10.1103/physrevlett.116.106103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Indexed: 06/05/2023]
Abstract
By measuring the prototypical antiferromagnet α-Fe_{2}O_{3}, we show that it is possible to determine the static spin orientation and dynamic spin correlations within nanometers from an antiferromagnetic surface using the nuclear spin polarization of implanted ^{8}Li^{+} ions detected with β-NMR. Remarkably, the first-order Morin spin reorientation in single crystal α-Fe_{2}O_{3} occurs at the same temperature at all depths between 1 and 100 nm from the (110) surface; however, the implanted nuclear spin experiences an increased 1/T_{1} relaxation rate at shallow depths revealing soft-surface magnons. The surface-localized dynamics decay towards the bulk with a characteristic length of ε=11±1 nm, closely matching the finite-size thresholds of hematite nanostructures.
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Affiliation(s)
- D L Cortie
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Chemistry Department, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - T Buck
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - M H Dehn
- Physik-Department, Technische Universität München, 85748 Garching bei München, Germany
| | - V L Karner
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - R F Kiefl
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - C D P Levy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - R M L McFadden
- Chemistry Department, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - G D Morris
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - I McKenzie
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M R Pearson
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - X L Wang
- Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2500, Australia
| | - W A MacFarlane
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Chemistry Department, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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6
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Saadaoui H, Salman Z, Luetkens H, Prokscha T, Suter A, MacFarlane WA, Jiang Y, Jin K, Greene RL, Morenzoni E, Kiefl RF. The phase diagram of electron-doped La(2-x)Ce(x)CuO(4-δ). Nat Commun 2015; 6:6041. [PMID: 25608106 DOI: 10.1038/ncomms7041] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 12/05/2014] [Indexed: 11/09/2022] Open
Abstract
Superconductivity is a striking example of a quantum phenomenon in which electrons move coherently over macroscopic distances without scattering. The high-temperature superconducting oxides (cuprates) are the most studied class of superconductors, composed of two-dimensional CuO2 planes separated by other layers that control the electron concentration in the planes. A key unresolved issue in cuprates is the relationship between superconductivity and magnetism. Here we report a sharp phase boundary of static three-dimensional magnetic order in the electron-doped superconductor La(2-x)Ce(x)CuO(4-δ), where small changes in doping or depth from the surface switch the material from superconducting to magnetic. Using low-energy spin-polarized muons, we find that static magnetism disappears close to where superconductivity begins and well below the doping level at which dramatic changes in the transport properties are reported. These results indicate a higher degree of symmetry between the electron and hole-doped cuprates than previously thought.
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Affiliation(s)
- H Saadaoui
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Z Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - T Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - A Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - W A MacFarlane
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Y Jiang
- Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA
| | - K Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - R L Greene
- Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA
| | - E Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - R F Kiefl
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
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7
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Salman Z, Ofer O, Radovic M, Hao H, Ben Shalom M, Chow KH, Dagan Y, Hossain MD, Levy CDP, Macfarlane WA, Morris GM, Patthey L, Pearson MR, Saadaoui H, Schmitt T, Wang D, Kiefl RF. Nature of weak magnetism in SrTiO3/LaAlO3 multilayers. Phys Rev Lett 2012; 109:257207. [PMID: 23368496 DOI: 10.1103/physrevlett.109.257207] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 09/20/2012] [Indexed: 06/01/2023]
Abstract
We report the observation of weak magnetism in superlattices of LaAlO(3)/SrTiO(3) using β-detected nuclear magnetic resonance. The spin lattice relaxation rate of ^{8}Li in superlattices with a spacer layers of 8 and 6 unit cells of LaAlO(3) exhibits a strong peak near ~35 K, whereas no such peak is observed in a superlattice with spacer layer thickness of 3 unit cells. We attribute the observed temperature dependence to slowing down of weakly coupled electronic moments at the LaAlO(3)/SrTiO(3) interface. These results show that the magnetism at the interface depends strongly on the thickness of the spacer layer, and that a minimal thickness of ~4-6 unit cells is required for the appearance of magnetism. A simple model is used to determine that the observed relaxation is due to small fluctuating moments (~0.002μ(B)) in the two samples with a larger LaAlO(3) spacer thickness.
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Affiliation(s)
- Z Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
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8
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Xu M, Hossain MD, Saadaoui H, Parolin TJ, Chow KH, Keeler TA, Kiefl RF, Morris GD, Salman Z, Song Q, Wang D, MacFarlane WA. Proximal magnetometry in thin films using betaNMR. J Magn Reson 2008; 191:47-55. [PMID: 18162424 DOI: 10.1016/j.jmr.2007.11.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Revised: 11/22/2007] [Accepted: 11/27/2007] [Indexed: 05/25/2023]
Abstract
Low energy ion implantation of hyperpolarized radioactive magnetic resonance probes allows the NMR study of thin film heterostructures by enabling depth-resolved measurements on a nanometer lengthscale. By stopping the probe ions in a layer adjacent to a layer of interest, it is possible to study magnetic fields proximally. Here we show that, in the simplest case of a uniformly magnetized layer, this yields an unperturbed in situ frequency reference. We also discuss demagnetization contributions to measured shifts for this case. With a simple illustrative calculation, we show how a nonuniformly magnetized layer causes a strongly depth-dependent line broadening in an adjacent layer. We then give some experimental examples of resonance line broadening in heterostructures.
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Affiliation(s)
- M Xu
- TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada V6T 2A3
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9
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Salman Z, Chow KH, Miller RI, Morello A, Parolin TJ, Hossain MD, Keeler TA, Levy CDP, MacFarlane WA, Morris GD, Saadaoui H, Wang D, Sessoli R, Condorelli GG, Kiefl RF. Local magnetic properties of a monolayer of Mn12 single molecule magnets. Nano Lett 2007; 7:1551-5. [PMID: 17488049 DOI: 10.1021/nl070366a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The magnetic properties of a monolayer of Mn12 single molecule magnets grafted onto a silicon (Si) substrate have been investigated using depth-controlled beta-detected nuclear magnetic resonance. A low-energy beam of spin-polarized radioactive 8Li was used to probe the local static magnetic field distribution near the Mn12 monolayer in the Si substrate. The resonance line width varies strongly as a function of implantation depth as a result of the magnetic dipolar fields generated by the Mn12 electronic magnetic moments. The temperature dependence of the line width indicates that the magnetic properties of the Mn12 moments in this low-dimensional configuration differ from bulk Mn12.
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Affiliation(s)
- Z Salman
- Clarendon Laboratory, Department of Physics, Oxford University, Parks Road, Oxford OX1 3PU, UK.
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10
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Salman Z, Wang D, Chow KH, Hossain MD, Kreitzman SR, Keeler TA, Levy CDP, MacFarlane WA, Miller RI, Morris GD, Parolin TJ, Saadaoui H, Smadella M, Kiefl RF. Magnetic-field effects on the size of vortices below the surface of NbSe2 detected using low energy beta-NMR. Phys Rev Lett 2007; 98:167001. [PMID: 17501451 DOI: 10.1103/physrevlett.98.167001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Indexed: 05/15/2023]
Abstract
A low energy radioactive beam of polarized 8Li has been used to observe the vortex lattice near the surface of superconducting NbSe2. The inhomogeneous magnetic-field distribution associated with the vortex lattice was measured using depth-resolved beta-detected NMR. Below Tc, one observes the characteristic line shape for a triangular vortex lattice which depends on the magnetic penetration depth and vortex core radius. The size of the vortex core varies strongly with the magnetic field. In particular, in a low field of 10.8 mT, the core radius is much larger than the coherence length. The possible origin of these giant vortices is discussed.
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Affiliation(s)
- Z Salman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, Canada
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11
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Parolin TJ, Salman Z, Chakhalian J, Song Q, Chow KH, Hossain MD, Keeler TA, Kiefl RF, Kreitzman SR, Levy CDP, Miller RI, Morris GD, Pearson MR, Saadaoui H, Wang D, MacFarlane WA. beta-NMR of isolated lithium in nearly ferromagnetic palladium. Phys Rev Lett 2007; 98:047601. [PMID: 17358812 DOI: 10.1103/physrevlett.98.047601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2006] [Indexed: 05/14/2023]
Abstract
The temperature dependence of the frequency shift and spin-lattice relaxation rate of isolated, nonmagnetic (8)Li impurities implanted in a nearly ferromagnetic host (Pd) are measured by means of beta-detected nuclear magnetic resonance (beta-NMR). The shift is negative, very large, and increases monotonically with decreasing T in proportion to the bulk susceptibility of Pd for T > T* approximately 100 K. Below T*, an additional shift occurs which we attribute to the response of Pd to the defect. The relaxation rate is much slower than expected for the large shift and is linear with T below T*, showing no sign of additional relaxation mechanisms associated with the defect.
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Affiliation(s)
- T J Parolin
- Department of Chemistry, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
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12
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Salman Z, Kiefl RF, Chow KH, Hossain MD, Keeler TA, Kreitzman SR, Levy CDP, Miller RI, Parolin TJ, Pearson MR, Saadaoui H, Schultz JD, Smadella M, Wang D, MacFarlane WA. Near-surface structural phase transition of SrTiO3 studied with zero-field beta-detected nuclear spin relaxation and resonance. Phys Rev Lett 2006; 96:147601. [PMID: 16712119 DOI: 10.1103/physrevlett.96.147601] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2005] [Indexed: 05/09/2023]
Abstract
We demonstrate that zero-field beta-detected nuclear quadrupole resonance and spin relaxation of low energy (8)Li can be used as a sensitive local probe of structural phase transitions near a surface. We find that the transition near the surface of a SrTiO(3) single crystal occurs at T(c) approximately 150K, i.e., approximately 45K higher than T(c)bulk, and that the tetragonal domains formed below T(c) are randomly oriented.
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Affiliation(s)
- Z Salman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
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13
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Schultz BE, Chow KH, Hitti B, Kiefl RF, Lichti RL, Cox SFJ. Local structure of isolated positively charged muonium as an analog for the hydrogen ion in p-type GaAs. Phys Rev Lett 2005; 95:086404. [PMID: 16196878 DOI: 10.1103/physrevlett.95.086404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2005] [Indexed: 05/04/2023]
Abstract
We determine the local structure of isolated positively charged muonium (Mu+) in heavily doped p-type GaAs based on muon level crossing resonance and zero applied field muon spin depolarization data. These measurements provide the first direct experimental confirmation that Mu+, and by analogy H+, is located within a stretched Ga-As bond. The distances between Mu+ and the nearest neighbor Ga and As atoms are estimated to be 1.83 +/- 0.10 A; and 1.76 +/- 0.10 A, respectively. These results are compared to existing theoretical calculations on the structure of hydrogen in GaAs and additionally provide data on the induced electric field gradients.
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Affiliation(s)
- B E Schultz
- Department of Physics, University of Alberta, Edmonton, Canada T6G 2J1
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14
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Morris GD, Macfarlane WA, Chow KH, Salman Z, Arseneau DJ, Daviel S, Hatakeyama A, Kreitzman SR, Levy CDP, Poutissou R, Heffner RH, Elenewski JE, Greene LH, Kiefl RF. Depth-controlled beta-NMR of 8Li in a thin silver film. Phys Rev Lett 2004; 93:157601. [PMID: 15524941 DOI: 10.1103/physrevlett.93.157601] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2003] [Indexed: 05/24/2023]
Abstract
Depth-controlled beta-NMR can be used to probe the magnetic properties of thin films and interfaces on a nanometer length scale. A 30 keV beam of highly spin-polarized 8Li+ ions was slowed down and implanted into a 50 nm film of Ag deposited on a SrTiO3 substrate. A novel high field beta-NMR spectrometer was used to observe two well resolved resonances which are attributed to Li occupying substitutional and octahedral interstitial sites in the Ag lattice. The temperature dependence of the Knight shifts and spin relaxation rates are consistent with the Korringa law for a simple metal, implying that the NMR of implanted 8Li reflects the spin suspectibility of bulk metallic silver.
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Affiliation(s)
- G D Morris
- Los Alamos National Laboratory, K764, Los Alamos, New Mexico 87545, USA
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15
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Chakhalian JA, Kiefl RF, Miller R, Brewer J, Dunsiger SR, Morris G, MacFarlane WA, Sonier JE, Eggert S, Affleck I, Keren A, Verdaguer M. Local magnetic susceptibility of the positive muon in the quasi-one-dimensional S=1/2 antiferromagnet dichlorobis (pyridine) copper (II). Phys Rev Lett 2003; 91:027202. [PMID: 12906505 DOI: 10.1103/physrevlett.91.027202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2003] [Indexed: 05/24/2023]
Abstract
We report muon spin rotation measurements of the local magnetic susceptibility around a positive muon in the paramagnetic state of the quasi-one-dimensional spin 1/2 antiferromagnet dichlorobis (pyridine) copper (II). Signals from three distinct sites are resolved and have a temperature dependent frequency shift which is significantly different than the magnetic susceptibility. This difference is attributed to a muon induced perturbation of the spin 1/2 chain. The obtained frequency shifts are compared with transfer matrix density-matrix renormalization-group numerical simulations.
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Affiliation(s)
- J A Chakhalian
- Department of Physics and Astronomy, UBC, Vancouver, BC, Canada V6T 1Z1
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16
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Lumsden MD, Dunsiger SR, Sonier JE, Miller RI, Kiefl RF, Jin R, He J, Mandrus D, Bramwell ST, Gardner JS. Temperature dependence of the magnetic penetration depth in the vortex state of the pyrochlore superconductor, Cd2Re2O7. Phys Rev Lett 2002; 89:147002. [PMID: 12366067 DOI: 10.1103/physrevlett.89.147002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2001] [Indexed: 05/23/2023]
Abstract
We report transverse-field and zero-field muon spin rotation and relaxation studies of the superconducting rhenium oxide pyrochlore, Cd2Re2O7. Transverse-field measurements (H=0.007 T) show line broadening below T(c), which is characteristic of a vortex state, demonstrating conclusively the type-II nature of this superconductor. The penetration depth is seen to level off below about 400 mK (T/T(c) approximately 0.4), with a rather large value of lambda(T=0) approximately 7500 A. The temperature independent behavior below approximately 400 mK is consistent with a nodeless superconducting energy gap. Zero-field measurements indicate no static magnetic fields developing below the transition temperature.
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Affiliation(s)
- M D Lumsden
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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17
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Miller RI, Kiefl RF, Brewer JH, Sonier JE, Chakhalian J, Dunsiger S, Morris GD, Price AN, Bonn DA, Hardy WH, Liang R. Evidence for static magnetism in the vortex cores of ortho-II YBa2Cu3O6.50. Phys Rev Lett 2002; 88:137002. [PMID: 11955116 DOI: 10.1103/physrevlett.88.137002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2001] [Indexed: 05/23/2023]
Abstract
Evidence for static alternating magnetic fields in the vortex cores of underdoped YBa2Cu3O6+x is reported. Muon spin rotation measurements of the internal magnetic field distribution of the vortex state of YBa2Cu3O6.50 in applied fields of H = 1 T and H = 4 T reveal a feature in the high-field tail of the field distribution which is not present in optimally doped YBa2Cu3O6.95 and which fits well to a model with static magnetic fields in the vortex cores. The magnitude of the fields is estimated to be 18(2) G and decreases above T = 10 K. We discuss possible origins of the additional vortex core magnetism within the context of existing theories.
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Affiliation(s)
- R I Miller
- Department of Physics & Astronomy, University of British Columbia, Vancouver, Canada.
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18
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Chow KH, Hitti B, Kiefl RF, Lichti RL, Estle TL. Muonium analog of hydrogen passivation: observation of the Mu+-Zn- reaction in GaAs. Phys Rev Lett 2001; 87:216403. [PMID: 11736357 DOI: 10.1103/physrevlett.87.216403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2001] [Indexed: 05/23/2023]
Abstract
We report direct detection of the formation and subsequent breakup of a complex containing positively charged muonium ( Mu+) and a substitutional Zn(Ga) acceptor in heavily doped p-type GaAs:Zn. Mu+ diffuses above 200 K with a hop rate nu = nu(0)e(-E(nu)/k(B)T) where nu(0) = (7.7+/-2.0)x10(8) s(-1) and E(nu) = 0.15(4) eV. Above 350 K, it forms the complex with a trapping radius of 500+/-200 A. The Mu-Zn complex breaks up above 550 K with a dissociation energy of 0.88(7) eV and prefactor of (5+/-4)x10(12) s(-1). Above 750 K, the cyclic reaction Mu+<--> Mu0 takes place.
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Affiliation(s)
- K H Chow
- Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1
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19
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Sonier JE, Brewer JH, Kiefl RF, Miller RI, Morris GD, Stronach CE, Gardner JS, Dunsiger SR, Bonn DA, Hardy WN, Liang R, Heffner RH. Anomalous weak magnetism in superconducting YBa2Cu3O6+x. Science 2001; 292:1692-5. [PMID: 11387468 DOI: 10.1126/science.1060844] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
For some time now, there has been considerable experimental and theoretical effort to understand the role of the normal-state "pseudogap" phase in underdoped high-temperature cuprate superconductors. Recent debate has centered on the question of whether the pseudogap is independent of superconductivity. We provide evidence from zero-field muon spin relaxation measurements in YBa2Cu3O6+x for the presence of small spontaneous static magnetic fields of electronic origin intimately related to the pseudogap transition. Our most significant finding is that, for optimal doping, these weak static magnetic fields appear well below the superconducting transition temperature. The two compositions measured suggest the existence of a quantum critical point somewhat above optimal doping.
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Affiliation(s)
- J E Sonier
- Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
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20
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Dunsiger SR, Gardner JS, Chakhalian JA, Cornelius AL, Jaime M, Kiefl RF, Movshovich R, MacFarlane WA, Miller RI, Sonier JE, Gaulin BD. Low temperature spin dynamics of the geometrically frustrated antiferromagnetic garnet Gd3Ga5O12. Phys Rev Lett 2000; 85:3504-3507. [PMID: 11030932 DOI: 10.1103/physrevlett.85.3504] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/1999] [Indexed: 05/23/2023]
Abstract
The low temperature spin dynamics of the geometrically frustrated antiferromagnet Gd 3Ga 5O (12) (GGG) have been investigated using muon spin relaxation. No evidence for static order is seen down to a temperature of 25 mK or a few percent of the Curie-Weiss temperature. Instead there is a linear decrease in the Gd spin fluctuation rate below 1 K which extrapolates to a small but finite value of 2 GHz at zero temperature. In terms of the spin fluctuations the system appears essentially to remain dynamic at low temperatures (T>0.02 K) and magnetic fields up to 1.8 T.
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Affiliation(s)
- SR Dunsiger
- Department of Physics and Astronomy, University of British Columbia, Canada V6T 1Z1
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21
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Miller RI, Kiefl RF, Brewer JH, Chakhalian J, Dunsiger S, Morris GD, Sonier JE, MacFarlane WA. Low temperature limit of the vortex core radius and the kramer-pesch effect in NbSe2. Phys Rev Lett 2000; 85:1540-1543. [PMID: 10970549 DOI: 10.1103/physrevlett.85.1540] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/1999] [Indexed: 05/23/2023]
Abstract
Muon spin rotation ( &mgr;SR) has been used to measure the magnetic field distribution in the vortex state of the type-II superconductor NbSe2 ( T(c) = 7.0 K) below T = 2 K. The distribution is consistent with a highly ordered hexagonal vortex lattice with a well resolved high-field cutoff associated with the finite size of the vortex cores. The temperature dependence of the core radius is much weaker than the temperature dependence predicted from the Bogoliubov-de Gennes theory. Furthermore, the vortex radius measured by &mgr;SR near the low temperature quantum limit is about an order of magnitude larger than predicted.
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Affiliation(s)
- RI Miller
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
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22
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Chow KH, Kiefl RF, Hitti B, Estle TL, Lichti RL. Novel behavior of bond-centered muonium in heavily doped n-type silicon: Curie-like spin susceptibility and charge screening. Phys Rev Lett 2000; 84:2251-2254. [PMID: 11017256 DOI: 10.1103/physrevlett.84.2251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/1999] [Indexed: 05/23/2023]
Abstract
Bond-centered muonium ( Mu(0)(BC)) has been observed in very heavily doped n-type Si:P. It exhibits a Curie-like electronic spin susceptibility which leads to a giant negative shift in the muon spin precession frequency. At high dopant levels, the Mu(0)(BC) hyperfine parameters, deduced from a model involving spin exchange with free carriers, are significantly reduced from those in intrinsic Si. This indicates that the spin density distribution for Mu(0)(BC) in metallic Si:P is altered significantly by charge screening effects, likely a general phenomenon for deep impurities in materials with high carrier concentrations.
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Affiliation(s)
- K H Chow
- Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015, USA
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23
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24
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Dunsiger SR, Kiefl RF, Chow KH, Gaulin BD, Gingras MJ, Greedan JE, Keren A, Kojima K, Luke GM, MacFarlane WA, Raju NP, Sonier JE, Uemura YJ, Wu WD. Muon spin relaxation investigation of the spin dynamics of geometrically frustrated antiferromagnets Y2Mo2O7 and Tb2Mo2O7. Phys Rev B Condens Matter 1996; 54:9019-9022. [PMID: 9984622 DOI: 10.1103/physrevb.54.9019] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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25
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Chow KH, Pattenden PA, Blundell SJ, Hayes W, Pratt FL, Jestädt T, Green MA, Millburn JE, Rosseinsky MJ, Hitti B, Dunsiger SR, Kiefl RF, Chen C, Chowdhury AJ. Muon-spin-relaxation studies of magnetic order in heavily doped La2-xSrxNiO4+ delta. Phys Rev B Condens Matter 1996; 53:R14725-R14728. [PMID: 9983340 DOI: 10.1103/physrevb.53.r14725] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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26
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Chow KH, Hitti B, Kiefl RF, Dunsiger SR, Lichti RL, Estle TL. Diffusion and charge dynamics of negatively charged muonium in n-type GaAs. Phys Rev Lett 1996; 76:3790-3793. [PMID: 10061110 DOI: 10.1103/physrevlett.76.3790] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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27
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Kadono R, Kiefl RF, MacFarlane WA, Dunsiger SR. Diffusion and localization of muonium in Na-doped KCl. Phys Rev B Condens Matter 1996; 53:3177-3182. [PMID: 9983827 DOI: 10.1103/physrevb.53.3177] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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28
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Chow KH, Kiefl RF, MacFarlane WA, Schneider JW, Cooke DW, Leon M, Paciotti M, Estle TL, Hitti B, Lichti RL, Cox SF, Schwab C, Davis EA, Morrobel-Sosa A, Zavieh L. Erratum: Structure of negatively charged muonium in n-type GaAs. Phys Rev B Condens Matter 1995; 52:16939. [PMID: 9981107 DOI: 10.1103/physrevb.52.16939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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29
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Riseman TM, Brewer JH, Chow KH, Hardy WN, Kiefl RF, Kreitzman SR, Liang R, MacFarlane WA, Mendels P, Morris GD, Rammer J, Schneider JW, Niedermayer C, Lee SL. Ginzburg-Landau parameter in YBa2Cu3O6.95 below the irreversibility temperature as measured by micro+SR in high magnetic fields. Phys Rev B Condens Matter 1995; 52:10569-10580. [PMID: 9980110 DOI: 10.1103/physrevb.52.10569] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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30
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Karlsson E, Wäppling R, Lidström SW, Hartmann O, Kadono R, Kiefl RF, Hempelmann R, Richter D. Quantum diffusion and localization of positive muons in superconducting aluminum. Phys Rev B Condens Matter 1995; 52:6417-6423. [PMID: 9981870 DOI: 10.1103/physrevb.52.6417] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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31
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MacFarlane WA, Kiefl RF, Dunsiger S, Sonier JE, Fischer JE. Magnetism in RbC60 studied by muon-spin rotation. Phys Rev B Condens Matter 1995; 52:R6995-R6998. [PMID: 9979733 DOI: 10.1103/physrevb.52.r6995] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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32
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Chow KH, Kiefl RF, MacFarlane WA, Schneider JW, Cooke DW, Leon M, Paciotti M, Estle TL, Hitti B, Lichti RL, Cox SF, Schwab C, Davis EA, Morrobel-Sosa A, Zavieh L. Structure of negatively charged muonium in n-type GaAs. Phys Rev B Condens Matter 1995; 51:14762-14765. [PMID: 9978422 DOI: 10.1103/physrevb.51.14762] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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33
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Chow KH, Lichti RL, Kiefl RF, Dunsiger S, Estle TL, Hitti B, Kadono R, MacFarlane WA, Schneider JW, Schumann D, Shelley M. Identification of neutral bond-centered muonium in n-type semiconductors by longitudinal muon-spin relaxation. Phys Rev B Condens Matter 1994; 50:8918-8921. [PMID: 9974927 DOI: 10.1103/physrevb.50.8918] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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34
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Kadono R, Matsushita A, Nagamine K, Nishiyama K, Chow KH, Kiefl RF, MacFarlane A, Schumann D, Fujii S, Tanigawa S. Charge state and diffusivity of muonium in n-type GaAs. Phys Rev B Condens Matter 1994; 50:1999-2002. [PMID: 9976401 DOI: 10.1103/physrevb.50.1999] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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35
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Sonier JE, Kiefl RF, Brewer JH, Bonn DA, Carolan JF, Chow KH, Dosanjh P, Hardy WN, Liang R, MacFarlane WA, Mendels P, Morris GD, Riseman TM, Schneider JW. New muon-spin-rotation measurement of the temperature dependence of the magnetic penetration depth in YBa2Cu3O6.95. Phys Rev Lett 1994; 72:744-747. [PMID: 10056512 DOI: 10.1103/physrevlett.72.744] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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36
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Schneider JW, Kiefl RF, Chow KH, Johnston S, Sonier J, Estle TL, Hitti B, Lichti RL, Connell SH, Sellschop JP, Smallman CG, Anthony TR, Banholzer WF. Bond-centered muonium in diamond: Resolved nuclear hyperfine structure. Phys Rev Lett 1993; 71:557-560. [PMID: 10055306 DOI: 10.1103/physrevlett.71.557] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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37
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Kiefl RF, MacFarlane WA, Chow KH, Dunsiger S, Duty TL, Johnston TM, Schneider JW, Sonier J, Brard L, Strongin RM, Fischer JE, Smith AB. Coherence peak and superconducting energy gap in Rb3C60 observed by muon spin relaxation. Phys Rev Lett 1993; 70:3987-3990. [PMID: 10054016 DOI: 10.1103/physrevlett.70.3987] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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38
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Chow KH, Kiefl RF, Schneider JW, Hitti B, Estle TL, Lichti RL, Schwab C, DuVarney RC, Kreitzman SR, MacFarlane WA, Senba M. Muonium dynamics in Si at high temperatures. Phys Rev B Condens Matter 1993; 47:16004-16007. [PMID: 10006012 DOI: 10.1103/physrevb.47.16004] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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39
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Schneider JW, Chow K, Kiefl RF, Kreitzman SR, MacFarlane A, DuVarney RC, Estle TL, Lichti RL, Schwab C. Electronic structure of anomalous muonium in GaP and GaAs. Phys Rev B Condens Matter 1993; 47:10193-10200. [PMID: 10005127 DOI: 10.1103/physrevb.47.10193] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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40
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Kiefl RF, Duty TL, Schneider JW, MacFarlane A, Chow K, Elzey J, Mendels P, Morris GD, Brewer JH, Ansaldo EJ, Niedermayer C, Noakes DR, Stronach CE, Hitti B, Fischer JE. Evidence for endohedral muonium in Kx C60 and consequences for electronic structure. Phys Rev Lett 1992; 69:2005-2008. [PMID: 10046372 DOI: 10.1103/physrevlett.69.2005] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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41
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Schneider JW, Kiefl RF, Chow K, Cox SF, Dodds SA, DuVarney RC, Estle TL, Kadono R, Kreitzman SR, Lichti RL, Schwab C. Local tunneling and metastability of muonium in CuCl. Phys Rev Lett 1992; 68:3196-3199. [PMID: 10045638 DOI: 10.1103/physrevlett.68.3196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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42
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Kiefl RF, Schneider JW, MacFarlane A, Chow K, Duty TL, Estle TL, Hitti B, Lichti RL, Ansaldo EJ, Schwab C, Percival PW, Wei G, Wlodek S, Kojima K, Romanow WJ, McCauley JP, Coustel N, Fischer JE, Smith AB. Molecular dynamics of micro+-C60 radical in solid C60. Phys Rev Lett 1992; 68:1347-1350. [PMID: 10046143 DOI: 10.1103/physrevlett.68.1347] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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43
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Kadono R, Kiefl RF. Comment on "Rapid low-temperature hopping of hydrogen in a pure metal: The ScHx system". Phys Rev Lett 1991; 66:2414. [PMID: 10043480 DOI: 10.1103/physrevlett.66.2414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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44
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Luke GM, Le LP, Sternlieb BJ, Uemura YJ, Brewer JH, Kadono R, Kiefl RF, Kreitzman SR, Riseman TM, Stronach CE, Davis MR, Uchida S, Takagi H, Tokura Y, Hidaka Y, Murakami T, Gopalakrishnan J, Sleight AW, Subramanian MA, Early EA, Markert JT, Maple MB, Seaman CL. Magnetic order and electronic phase diagrams of electron-doped copper oxide materials. Phys Rev B Condens Matter 1990; 42:7981-7988. [PMID: 9994963 DOI: 10.1103/physrevb.42.7981] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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45
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Seaman CL, Neumeier JJ, Maple MB, Le LP, Luke GM, Sternlieb BJ, Uemura YJ, Brewer JH, Kadono R, Kiefl RF, Krietzman SR, Riseman TM. Magnetic penetration depth of Y1-xPrxBa2Cu3O6.97 measured by muon-spin relaxation. Phys Rev B Condens Matter 1990; 42:6801-6804. [PMID: 9994790 DOI: 10.1103/physrevb.42.6801] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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46
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Kiefl RF, Brewer JH, Affleck I, Carolan JF, Dosanjh P, Hardy WN, Hsu T, Kadono R, Kempton JR, Kreitzman SR, Li Q, O'Reilly AH, Riseman TM, Schleger P, Stamp PC, Zhou H, Le LP, Luke GM, Sternlieb B, Uemura YJ, Hart HR, Lay KW. Search for anomalous internal magnetic fields in high-Tc superconductors as evidence for broken time-reversal symmetry. Phys Rev Lett 1990; 64:2082-2085. [PMID: 10041572 DOI: 10.1103/physrevlett.64.2082] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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47
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Schneider JW, Celio M, Keller H, Kündig W, Odermatt W, Pümpin B, Savic IM, Simmler H, Estle TL, Schwab C, Kiefl RF, Renker D. Nuclear hyperfine structure of muonium in CuCl resolved by means of avoided level crossing. Phys Rev B Condens Matter 1990; 41:7254-7257. [PMID: 9993000 DOI: 10.1103/physrevb.41.7254] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kadono R, Kiefl RF, Ansaldo EJ, Brewer JH, Celio M, Kreitzman SR, Luke GM. Delocalization of muonium in NaCl. Phys Rev Lett 1990; 64:665-668. [PMID: 10042042 DOI: 10.1103/physrevlett.64.665] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Sternlieb BJ, Luke GM, Uemura YJ, Brewer JH, Kadono R, Kempton JR, Kiefl RF, Kreitzman SR, Riseman TM, Williams DL, Gopalakrishnan J, Sleight AW, Strzelecki AR, Subramanian MA. Magnetic and superconducting phase diagram of Bi2Sr3-xYxCu2O8 as determined by muon-spin rotation. Phys Rev B Condens Matter 1989; 40:11320-11323. [PMID: 9991705 DOI: 10.1103/physrevb.40.11320] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kiefl RF, Brewer JH, Carolan J, Dosanjh P, Hardy WN, Kadono R, Kempton JR, Krahn R, Schleger P, Yang BX, Zhou H, Luke GM, Sternlieb B, Uemura YJ, Kossler WJ, Yu XH, Ansaldo EJ, Takagi H, Uchida S, Seaman CL. Muon-spin-rotation study of magnetism in La1.85Sr0.15CuO4 and YBa2Cu3Ox below 90 mK. Phys Rev Lett 1989; 63:2136-2139. [PMID: 10040771 DOI: 10.1103/physrevlett.63.2136] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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