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von Rohr FO, Orain JC, Khasanov R, Witteveen C, Shermadini Z, Nikitin A, Chang J, Wieteska AR, Pasupathy AN, Hasan MZ, Amato A, Luetkens H, Uemura YJ, Guguchia Z. Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides. Sci Adv 2019; 5:eaav8465. [PMID: 31819897 PMCID: PMC6884407 DOI: 10.1126/sciadv.aav8465] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 09/17/2019] [Indexed: 06/10/2023]
Abstract
We report on muon spin rotation experiments probing the magnetic penetration depth λ(T) in the layered superconductors in 2H-NbSe2 and 4H-NbSe2. The current results, along with our earlier findings on 1T'-MoTe2 (Guguchia et al.), demonstrate that the superfluid density scales linearly with T c in the three transition metal dichalcogenide superconductors. Upon increasing pressure, we observe a substantial increase of the superfluid density in 2H-NbSe2, which we find to correlate with T c. The correlation deviates from the abovementioned linear trend. A similar deviation from the Uemura line was also observed in previous pressure studies of optimally doped cuprates. This correlation between the superfluid density and T c is considered a hallmark feature of unconventional superconductivity. Here, we show that this correlation is an intrinsic property of the superconductivity in transition metal dichalcogenides, whereas the ratio T c/T F is approximately a factor of 20 lower than the ratio observed in hole-doped cuprates. We, furthermore, find that the values of the superconducting gaps are insensitive to the suppression of the charge density wave state.
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Affiliation(s)
- F. O. von Rohr
- Department of Chemistry, University of Zürich, CH-8057 Zürich, Switzerland
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - J.-C. Orain
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - R. Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - C. Witteveen
- Department of Chemistry, University of Zürich, CH-8057 Zürich, Switzerland
| | - Z. Shermadini
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A. Nikitin
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - J. Chang
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - A. R. Wieteska
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - A. N. Pasupathy
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - M. Z. Hasan
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ 08544, USA
| | - A. Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - H. Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Y. J. Uemura
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - Z. Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Department of Physics, Columbia University, New York, NY 10027, USA
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ 08544, USA
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2
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Li WM, Zhao JF, Cao LP, Hu Z, Huang QZ, Wang XC, Liu Y, Zhao GQ, Zhang J, Liu QQ, Yu RZ, Long YW, Wu H, Lin HJ, Chen CT, Li Z, Gong ZZ, Guguchia Z, Kim JS, Stewart GR, Uemura YJ, Uchida S, Jin CQ. Superconductivity in a unique type of copper oxide. Proc Natl Acad Sci U S A 2019; 116:12156-12160. [PMID: 31109998 PMCID: PMC6589659 DOI: 10.1073/pnas.1900908116] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The mechanism of superconductivity in cuprates remains one of the big challenges of condensed matter physics. High-T c cuprates crystallize into a layered perovskite structure featuring copper oxygen octahedral coordination. Due to the Jahn Teller effect in combination with the strong static Coulomb interaction, the octahedra in high-T c cuprates are elongated along the c axis, leading to a 3dx 2-y 2 orbital at the top of the band structure wherein the doped holes reside. This scenario gives rise to 2D characteristics in high-T c cuprates that favor d-wave pairing symmetry. Here, we report superconductivity in a cuprate Ba2CuO4-y , wherein the local octahedron is in a very exceptional compressed version. The Ba2CuO4-y compound was synthesized at high pressure at high temperatures and shows bulk superconductivity with critical temperature (T c ) above 70 K at ambient conditions. This superconducting transition temperature is more than 30 K higher than the T c for the isostructural counterparts based on classical La2CuO4 X-ray absorption measurements indicate the heavily doped nature of the Ba2CuO4-y superconductor. In compressed octahedron, the 3d3z 2-r 2 orbital will be lifted above the 3dx 2-y 2 orbital, leading to significant 3D nature in addition to the conventional 3dx 2-y 2 orbital. This work sheds important light on advancing our comprehensive understanding of the superconducting mechanism of high T c in cuprate materials.
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Affiliation(s)
- W M Li
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| | - J F Zhao
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - L P Cao
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - Z Hu
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straβe 40, 01187 Dresden, Germany
| | - Q Z Huang
- NIST Center for Neutron Research, Gaithersburg, MD 20899
| | - X C Wang
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| | - Y Liu
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - G Q Zhao
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - J Zhang
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - Q Q Liu
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - R Z Yu
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| | - Y W Long
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| | - H Wu
- NIST Center for Neutron Research, Gaithersburg, MD 20899
| | - H J Lin
- National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan
| | - C T Chen
- National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan
| | - Z Li
- School of Materials Science and Engineering, Nanjing University of Science and Technology, 210094 Nanjing, China
| | - Z Z Gong
- Department of Physics, Columbia University, New York, NY 10027
| | - Z Guguchia
- Department of Physics, Columbia University, New York, NY 10027
| | - J S Kim
- Department of Physics, University of Florida, Gainesville, FL 32611
| | - G R Stewart
- Department of Physics, University of Florida, Gainesville, FL 32611
| | - Y J Uemura
- Department of Physics, Columbia University, New York, NY 10027
| | - S Uchida
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- Department of Physics, University of Tokyo, 113-0033 Tokyo, Japan
| | - C Q Jin
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
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3
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Wu S, Phelan WA, Liu L, Morey JR, Tutmaher JA, Neuefeind JC, Huq A, Stone MB, Feygenson M, Tam DW, Frandsen BA, Trump B, Wan C, Dunsiger SR, McQueen TM, Uemura YJ, Broholm CL. Incommensurate Magnetism Near Quantum Criticality in CeNiAsO. Phys Rev Lett 2019; 122:197203. [PMID: 31144966 DOI: 10.1103/physrevlett.122.197203] [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: 03/03/2019] [Indexed: 06/09/2023]
Abstract
We report the discovery of incommensurate magnetism near quantum criticality in CeNiAsO through neutron scattering and zero field muon spin rotation. For T<T_{N1}=8.7(3) K, a second order phase transition yields an incommensurate spin density with a wave vector k=(0.44(4),0,0). For T<T_{N2}=7.6(3) K, we find coplanar commensurate order with a moment of 0.37(5)μ_{B}, reduced to 30% of the saturation moment of the |±1/2⟩ Kramers doublet ground state, which we establish through inelastic neutron scattering. Muon spin rotation in CeNiAs_{1-x}P_{x}O shows the commensurate order only exists for x≤0.1 so we infer the transition at x_{c}=0.4(1) is between an incommensurate longitudinal spin density wave and a paramagnetic Fermi liquid.
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Affiliation(s)
- Shan Wu
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Physics, University of California Berkeley, Berkeley, California 94720, USA
| | - W A Phelan
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - L Liu
- Department of Physics, Columbia University, New York, New York 10027, USA
| | - J R Morey
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - J A Tutmaher
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - J C Neuefeind
- Oak Ridge National Laboratory, Chemical and Engineering Materials Division, Oak Ridge, Tennessee 37831, USA
| | - Ashfia Huq
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
| | - Matthew B Stone
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
| | - M Feygenson
- Juelich Centre for Neutron Science, Forschungszentrum Juelich GmbH, 52425 Juelich, Germany
| | - David W Tam
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
| | - Benjamin A Frandsen
- Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA
| | - Benjamin Trump
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Cheng Wan
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - S R Dunsiger
- Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
| | - T M McQueen
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Y J Uemura
- Department of Physics, Columbia University, New York, New York 10027, USA
| | - C L Broholm
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
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4
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Han W, Chen BJ, Gu B, Zhao GQ, Yu S, Wang XC, Liu QQ, Deng Z, Li WM, Zhao JF, Cao LP, Peng Y, Shen X, Zhu XH, Yu RC, Maekawa S, Uemura YJ, Jin CQ. Li(Cd,Mn)P: a new cadmium based diluted ferromagnetic semiconductor with independent spin & charge doping. Sci Rep 2019; 9:7490. [PMID: 31097727 PMCID: PMC6522530 DOI: 10.1038/s41598-019-43754-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 12/13/2018] [Indexed: 11/09/2022] Open
Abstract
We report a new diluted ferromagnetic semiconductor Li1+y(Cd,Mn)P, wherein carrier is doped via excess Li while spin is doped by isovalence substitution of Mn2+ into Cd2+. The extended Cd 4d-orbitals lead to more itinerant characters of Li1+y(Cd,Mn)P than that of analogous Li1+y(Zn,Mn)P. A higher Curie temperature of 45 K than that for Li1+y(Zn,Mn)P is obtained in Li1+y(Cd,Mn)P polycrystalline samples by Arrott plot technique. The p-type carriers are determined by Hall effect measurements. The first principle calculations and X-ray diffraction measurements indicate that occupation of excess Li is at Cd sites rather than the interstitial site. Consequently holes are doped by excess Li substitution. More interestingly Li1+y(Cd,Mn)P shows a very low coercive field (<100 Oe) and giant negative magnetoresistance (~80%) in ferromagnetic state that will benefit potential spintronics applications.
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Affiliation(s)
- W Han
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China.,Department of Physics and Electronic Engineering, Hebei Normal University for Nationalities, Chengde, 067000, China
| | - B J Chen
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - B Gu
- Kavli Institute for Theoretical Sciences & CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, 100190, China.,Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, 319-1195, Japan
| | - G Q Zhao
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - S Yu
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - X C Wang
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Q Q Liu
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Z Deng
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China. .,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China.
| | - W M Li
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - J F Zhao
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - L P Cao
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Y Peng
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.,Department of Materials Science & Engineering, Sichuan University, Chengdu, China
| | - X Shen
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - X H Zhu
- Department of Materials Science & Engineering, Sichuan University, Chengdu, China
| | - R C Yu
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - S Maekawa
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, 319-1195, Japan
| | - Y J Uemura
- Department of Physics, Columbia University, New York, New York, 10027, USA
| | - C Q Jin
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China. .,School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China. .,Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China.
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5
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Guguchia Z, Kerelsky A, Edelberg D, Banerjee S, von Rohr F, Scullion D, Augustin M, Scully M, Rhodes DA, Shermadini Z, Luetkens H, Shengelaya A, Baines C, Morenzoni E, Amato A, Hone JC, Khasanov R, Billinge SJL, Santos E, Pasupathy AN, Uemura YJ. Magnetism in semiconducting molybdenum dichalcogenides. Sci Adv 2018; 4:eaat3672. [PMID: 30588488 PMCID: PMC6303124 DOI: 10.1126/sciadv.aat3672] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 11/19/2018] [Indexed: 05/30/2023]
Abstract
Transition metal dichalcogenides (TMDs) are interesting for understanding the fundamental physics of two-dimensional (2D) materials as well as for applications to many emerging technologies, including spin electronics. Here, we report the discovery of long-range magnetic order below T M = 40 and 100 K in bulk semiconducting TMDs 2H-MoTe2 and 2H-MoSe2, respectively, by means of muon spin rotation (μSR), scanning tunneling microscopy (STM), and density functional theory (DFT) calculations. The μSR measurements show the presence of large and homogeneous internal magnetic fields at low temperatures in both compounds indicative of long-range magnetic order. DFT calculations show that this magnetism is promoted by the presence of defects in the crystal. The STM measurements show that the vast majority of defects in these materials are metal vacancies and chalcogen-metal antisites, which are randomly distributed in the lattice at the subpercent level. DFT indicates that the antisite defects are magnetic with a magnetic moment in the range of 0.9 to 2.8 μB. Further, we find that the magnetic order stabilized in 2H-MoTe2 and 2H-MoSe2 is highly sensitive to hydrostatic pressure. These observations establish 2H-MoTe2 and 2H-MoSe2 as a new class of magnetic semiconductors and open a path to studying the interplay of 2D physics and magnetism in these interesting semiconductors.
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Affiliation(s)
- Z. Guguchia
- Department of Physics, Columbia University, New York, NY 10027, USA
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A. Kerelsky
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - D. Edelberg
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - S. Banerjee
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
| | - F. von Rohr
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - D. Scullion
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
| | - M. Augustin
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
| | - M. Scully
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
| | - D. A. Rhodes
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - Z. Shermadini
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - H. Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A. Shengelaya
- Department of Physics, Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia
- Andronikashvili Institute of Physics of I. Javakhishvili Tbilisi State University, Tamarashvili str. 6, 0177 Tbilisi, Georgia
| | - C. Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - E. Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A. Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - J. C. Hone
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - R. Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - S. J. L. Billinge
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - E. Santos
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
| | - A. N. Pasupathy
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - Y. J. Uemura
- Department of Physics, Columbia University, New York, NY 10027, USA
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6
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Cai Y, Wilson MN, Hallas AM, Liu L, Frandsen BA, Dunsiger SR, Krizan JW, Cava RJ, Rubel O, Uemura YJ, Luke GM. μSR study of spin freezing and persistent spin dynamics in NaCaNi 2F 7. J Phys Condens Matter 2018; 30:385802. [PMID: 30089706 DOI: 10.1088/1361-648x/aad91c] [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] [Indexed: 06/08/2023]
Abstract
A new pyrochlore compound, NaCaNi2F7, was recently synthesized and has a single magnetic site with spin-1 Ni2+ . We present zero field and longitudinal field muon spin rotation (μSR) measurements on this pyrochlore. Density functional theory calculations show that the most likely muon site is located between two fluorine ions, but off-centre. A characteristic F-μ-F muon spin polarization function is observed at high temperatures where Ni spin fluctuations are sufficiently rapid. The Ni2+ spins undergo spin freezing into a disordered ground state below 4 K, with a characteristic internal field strength of 140 G. Persistent Ni spin dynamics are present to our lowest temperatures (75 mK), a feature characteristic of many geometrically frustrated magnetic systems.
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Affiliation(s)
- Y Cai
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
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7
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Guguchia Z, Roessli B, Khasanov R, Amato A, Pomjakushina E, Conder K, Uemura YJ, Tranquada JM, Keller H, Shengelaya A. Complementary Response of Static Spin-Stripe Order and Superconductivity to Nonmagnetic Impurities in Cuprates. Phys Rev Lett 2017; 119:087002. [PMID: 28952761 DOI: 10.1103/physrevlett.119.087002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Indexed: 06/07/2023]
Abstract
We report muon-spin rotation and neutron-scattering experiments on nonmagnetic Zn impurity effects on the static spin-stripe order and superconductivity of the La214 cuprates. Remarkably, it was found that, for samples with hole doping x≈1/8, the spin-stripe ordering temperature T_{so} decreases linearly with Zn doping y and disappears at y≈4%, demonstrating a high sensitivity of static spin-stripe order to impurities within a CuO_{2} plane. Moreover, T_{so} is suppressed by Zn in the same manner as the superconducting transition temperature T_{c} for samples near optimal hole doping. This surprisingly similar sensitivity suggests that the spin-stripe order is dependent on intertwining with superconducting correlations.
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Affiliation(s)
- Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Department of Physics, Columbia University, New York, New York 10027, USA
| | - B Roessli
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - E Pomjakushina
- Laboratory for scientific developments and novel materials, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - K Conder
- Laboratory for scientific developments and novel materials, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - Y J Uemura
- Department of Physics, Columbia University, New York, New York 10027, USA
| | - J M Tranquada
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - H Keller
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - A Shengelaya
- Department of Physics, Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia
- Andronikashvili Institute of Physics, I. Javakhishvili Tbilisi State University, Tamarashvili Street 6, 0177 Tbilisi, Georgia
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8
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Guo SL, Zhao Y, Man HY, Ding C, Gong X, Zhi GX, Fu LC, Gu YL, Frandsen BA, Liu L, Cheung SC, Munsie TJ, Wilson MN, Cai YP, Luke GM, Uemura YJ, Ning FL. μSR investigation of a new diluted magnetic semiconductor Li(Zn,Mn,Cu)As with Mn and Cu codoping at the same Zn sites. J Phys Condens Matter 2016; 28:366001. [PMID: 27401041 DOI: 10.1088/0953-8984/28/36/366001] [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] [Indexed: 06/06/2023]
Abstract
We report the successful synthesis and characterization of a new type I-II-V bulk form diluted magnetic semiconductor (DMS) Li(Zn,Mn,Cu)As, in which charge and spin doping are decoupled via (Cu,Zn) and (Mn,Zn) substitution at the same Zn sites. Ferromagnetic transition temperature up to ∼33 K has been observed with a coercive field ∼40 Oe for the 12.5% doping level. μSR measurements confirmed that the magnetic volume fraction reaches nearly 100% at 2 K, and the mechanism responsible for the ferromagnetic interaction in this system is the same as other bulk form DMSs.
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Affiliation(s)
- S L Guo
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China. Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
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9
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Ding C, Guo S, Zhao Y, Man H, Fu L, Gu Y, Wang Z, Liu L, Frandsen BA, Cheung S, Uemura YJ, Goko T, Luetkens H, Morenzoni E, Zhao Y, Ning FL. The synthesis and characterization of 1 1 1 1 type diluted ferromagnetic semiconductor (La(1-x)Ca(x))(Zn(1-x) Mn(x))AsO. J Phys Condens Matter 2016; 28:026003. [PMID: 26679223 DOI: 10.1088/0953-8984/28/2/026003] [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] [Indexed: 06/05/2023]
Abstract
We report the synthesis and characterization of a bulk form diluted magnetic semiconductor, (La(1-x)Ca(x))(Zn(1-y) Mn(y))AsO, with a layered crystal structure isostructural to that of the 1 1 1 1 type Fe-based high-temperature superconductor LaFeAsO and the antiferromagnetic LaMnAsO. With Ca and Mn codoping into LaZnAsO, the ferromagnetic ordering occurs below the Curie temperature T(c) ∼30 K. Taking advantage of the decoupled charge and spin doping, we investigate the influence of carrier concentration on the ferromagnetic ordering state. For a fixed Mn concentration of 10%, T(c) increases from 24 K to 30 K when the Ca concentration increases from 5% to 10%. Further increase of Ca concentration reduces both the coercive field and saturation moment. Muon spin relaxation measurements confirm the ferromagnetically ordered state, and clearly demonstrate that La(1-x)Ca(x))(Zn(1-y) Mn(y))AsO shares a common mechanism for the ferromagnetic exchange interaction with (Ga,Mn)As. Neutron scattering measurements show no structural transition in (La(0.90)Ca(0.10))(Zn(0.90)Mn(0.10)) AsO below 300 K.
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Affiliation(s)
- Cui Ding
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China. Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
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10
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Thompson CM, Carlo JP, Flacau R, Aharen T, Leahy IA, Pollichemi JR, Munsie TJS, Medina T, Luke GM, Munevar J, Cheung S, Goko T, Uemura YJ, Greedan JE. Long-range magnetic order in the 5d(2) double perovskite Ba2CaOsO6: comparison with spin-disordered Ba2YReO6. J Phys Condens Matter 2014; 26:306003. [PMID: 25001885 DOI: 10.1088/0953-8984/26/30/306003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The B-site ordered double perovskite Ba2CaOsO6 was studied by dc magnetic susceptibility, powder neutron diffraction and muon spin relaxation methods. The lattice parameter is a = 8.3619(6) Å at 280 K and cubic symmetry [Formula: see text] is retained to 3.5 K with a = 8.3462(7) Å. Curie-Weiss susceptibility behaviour is observed for T > 100 K and the derived constants are C = 0.3361(3) emu K mol(-1) and ΘCW = -156.2(3) K, in excellent agreement with literature values. This Curie constant is much smaller than the spin-only value of 1.00 emu K mol(-1) for a 5d(2) Os(6+) configuration, indicating a major influence of spin-orbit coupling. Previous studies had detected both susceptibility and heat capacity anomalies near 50 K but no definitive conclusion was drawn concerning the nature of the ground state. While no ordered Os moment could be detected by powder neutron diffraction, muon spin relaxation (µSR) data show clear long-lived oscillations indicative of a continuous transition to long-range magnetic order below TC = 50 K. An estimate of the ordered moment on Os(6+) is ∼ 0.2 μB, based upon a comparison with µSR data for Ba2YRuO6 with a known ordered moment of 2.2 μB. These results are compared with those for isostructural Ba2YReO6 which contains Re(5+), also 5d(2), and has a nearly identical unit cell constant, a = 8.36278(2) Å-a structural doppelgänger. In contrast, Ba2YReO6 shows ΘCW = - 616 K, and a complex spin-disordered and, ultimately, spin-frozen ground state below 50 K, indicating a much higher level of geometric frustration than in Ba2CaOsO6. The results on these 5d(2) systems are compared to recent theory, which predicts a variety of ferromagnetic and antiferromagnetic ground states. In the case of Ba2CaOsO6, our data indicate that a complex four-sublattice magnetic structure is likely. This is in contrast to the spin-disordered ground state in Ba2YReO6, despite a lack of evidence for structural disorder, for which theory currently provides no clear explanation.
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Affiliation(s)
- C M Thompson
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada. Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON L8S 4M1, Canada
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11
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Carlo JP, Goko T, Gat-Malureanu IM, Russo PL, Savici AT, Aczel AA, MacDougall GJ, Rodriguez JA, Williams TJ, Luke GM, Wiebe CR, Yoshida Y, Nakatsuji S, Maeno Y, Taniguchi T, Uemura YJ. New magnetic phase diagram of (Sr,Ca)2RuO4. Nat Mater 2012; 11:323-328. [PMID: 22344326 DOI: 10.1038/nmat3236] [Citation(s) in RCA: 5] [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: 08/23/2010] [Accepted: 12/23/2011] [Indexed: 05/31/2023]
Abstract
High-T(c) cuprates, iron pnictides, organic BEDT and TMTSF, alkali-doped C(60), and heavy-fermion systems have superconducting states adjacent to competing states exhibiting static antiferromagnetic or spin density wave order. This feature has promoted pictures for their superconducting pairing mediated by spin fluctuations. Sr(2)RuO(4) is another unconventional superconductor which almost certainly has a p-wave pairing. The absence of known signatures of static magnetism in the Sr-rich side of the (Ca, Sr) substitution space, however, has led to a prevailing view that the superconducting state in Sr(2)RuO(4) emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca)(2)RuO(4) has a ground state with static magnetic order over nearly the entire range of (Ca, Sr) substitution, with spin-glass behaviour in Sr(1.5)Ca(0.5)RuO(4) and Ca(1.5)Sr(0.5)RuO(4). The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr(2)RuO(4) to competing static magnetic order.
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Affiliation(s)
- J P Carlo
- Department of Physics, Columbia University, New York, New York 10027, USA
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12
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Dunsiger SR, Aczel AA, Arguello C, Dabkowska H, Dabkowski A, Du MH, Goko T, Javanparast B, Lin T, Ning FL, Noad HML, Singh DJ, Williams TJ, Uemura YJ, Gingras MJP, Luke GM. Spin ice: magnetic excitations without monopole signatures using muon spin rotation. Phys Rev Lett 2011; 107:207207. [PMID: 22181768 DOI: 10.1103/physrevlett.107.207207] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Indexed: 05/31/2023]
Abstract
Theory predicts the low temperature magnetic excitations in spin ices consist of deconfined magnetic charges, or monopoles. A recent transverse-field (TF) muon spin rotation (μSR) experiment [S. T. Bramwell et al., Nature (London) 461, 956 (2009)] reports results claiming to be consistent with the temperature and magnetic field dependence anticipated for monopole nucleation-the so-called second Wien effect. We demonstrate via a new series of μSR experiments in Dy(2)Ti(2)O(7) that such an effect is not observable in a TF μSR experiment. Rather, as found in many highly frustrated magnetic materials, we observe spin fluctuations which become temperature independent at low temperatures, behavior which dominates over any possible signature of thermally nucleated monopole excitations.
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Affiliation(s)
- S R Dunsiger
- Physik Department, Technische Universität München, Garching, Germany.
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Rodriguez J, Aczel AA, Carlo JP, Dunsiger SR, Macdougall GJ, Russo PL, Savici AT, Uemura YJ, Wiebe CR, Luke GM. Study of the ground state properties of LiHo(x)Y(1-x)F4 using muon spin relaxation. Phys Rev Lett 2010; 105:107203. [PMID: 20867545 DOI: 10.1103/physrevlett.105.107203] [Citation(s) in RCA: 1] [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: 10/25/2009] [Revised: 04/26/2010] [Indexed: 05/29/2023]
Abstract
LiHo(x)Y(1-x)F4 is an insulator where the magnetic Ho3+ ions have an Ising character and interact mainly through magnetic dipolar fields. We used the muon spin relaxation technique to study the nature of its ground state for samples with x ≤ 0.25. In contrast with some previous works, we did not find canonical spin glass behavior down to ≈ 15 mK. Instead, below ≈300 mK we observed temperature-independent dynamic magnetism characterized by a single correlation time. The 300 mK energy scale corresponds to the Ho3+ hyperfine interaction strength, suggesting that this interaction may be involved in the dynamic behavior of the system.
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Affiliation(s)
- J Rodriguez
- Department of Physics and Astronomy, McMaster University, Hamilton, ON, Canada, L8S 4M1.
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Dunsiger SR, Carlo JP, Goko T, Nieuwenhuys G, Prokscha T, Suter A, Morenzoni E, Chiba D, Nishitani Y, Tanikawa T, Matsukura F, Ohno H, Ohe J, Maekawa S, Uemura YJ. Spatially homogeneous ferromagnetism of (Ga, Mn)As. Nat Mater 2010; 9:299-303. [PMID: 20305642 DOI: 10.1038/nmat2715] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Accepted: 01/28/2010] [Indexed: 05/29/2023]
Abstract
Mn-doped GaAs is a ferromagnetic semiconductor, widely studied because of its possible application for spin-sensitive 'spintronics' devices. The material also attracts great interest in fundamental research regarding its evolution from a paramagnetic insulator to a ferromagnetic metal. The high sensitivity of its physical properties to preparation conditions and heat treatments and the strong doping and temperature dependencies of the magnetic anisotropy have generated a view in the research community that ferromagnetism in (Ga, Mn)As may be associated with unavoidable and intrinsic strong spatial inhomogeneity. Muon spin relaxation (muSR) probes magnetism, yielding unique information about the volume fraction of regions having static magnetic order, as well as the size and distribution of the ordered moments. By combining low-energy muSR, conductivity and a.c. and d.c. magnetization results obtained on high-quality thin-film specimens, we demonstrate here that (Ga, Mn)As shows a sharp onset of ferromagnetic order, developing homogeneously in the full volume fraction, in both insulating and metallic films. Smooth evolution of the ordered moment size across the insulator-metal phase boundary indicates strong ferromagnetic coupling between Mn moments that exists before the emergence of fully itinerant hole carriers.
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Carlo JP, Uemura YJ, Goko T, Macdougall GJ, Rodriguez JA, Yu W, Luke GM, Dai P, Shannon N, Miyasaka S, Suzuki S, Tajima S, Chen GF, Hu WZ, Luo JL, Wang NL. Static magnetic order and superfluid density of RFeAs(O,F) (R=La,Nd,Ce) and LaFePO studied by muon spin relaxation: unusual similarities with the behavior of cuprate superconductors. Phys Rev Lett 2009; 102:087001. [PMID: 19257776 DOI: 10.1103/physrevlett.102.087001] [Citation(s) in RCA: 4] [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: 05/14/2008] [Indexed: 05/27/2023]
Abstract
Muon spin relaxation measurements in iron-oxypnictide systems have revealed: (1) commensurate long-range order in undoped LaFeAsO; (2) a Bessel function line shape in LaFeAs(O0.97F0.03) which indicates possible incommensurate or stripe magnetism; (3) anomalous weak magnetism existing in superconducting LaFePO, CeFeAs(O0.084F0.16), and NdFeAs(O0.88F0.12) but absent in superconducting LaFeAs(O0.92F0.08); and (4) scaling of the superfluid density with T_{c} in the Ce-, La-, and Nd-FeAs superconductors following a nearly linear relationship found in cuprates.
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Affiliation(s)
- J P Carlo
- Department of Physics, Columbia University, New York, New York 10027, USA
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16
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MacDougall GJ, Aczel AA, Carlo JP, Ito T, Rodriguez J, Russo PL, Uemura YJ, Wakimoto S, Luke GM. Absence of broken time-reversal symmetry in the pseudogap state of the high temperature La(2-x)SrxCuO4 superconductor from muon-spin-relaxation measurements. Phys Rev Lett 2008; 101:017001. [PMID: 18764143 DOI: 10.1103/physrevlett.101.017001] [Citation(s) in RCA: 1] [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: 01/16/2008] [Indexed: 05/26/2023]
Abstract
We have performed zero-field muon-spin-relaxation measurements on single crystals of La(2-x)SrxCuO4 to search for spontaneous currents in the pseudogap state. By comparing measurements on materials across the phase diagram, we put strict upper limits on any possible time-reversal symmetry breaking fields that could be associated with the pseudogap. Comparison between experimental limits and the proposed circulating current states effectively eliminates the possibility that such states exist in this family of materials.
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Affiliation(s)
- G J MacDougall
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada, L8S-4M1
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Savici AT, Fukaya A, Gat-Malureanu IM, Ito T, Russo PL, Uemura YJ, Wiebe CR, Kyriakou PP, MacDougall GJ, Rovers MT, Luke GM, Kojima KM, Goto M, Uchida S, Kadono R, Yamada K, Tajima S, Masui T, Eisaki H, Kaneko N, Greven M, Gu GD. Muon spin relaxation studies of magnetic-field-induced effects in high-Tc superconductors. Phys Rev Lett 2005; 95:157001. [PMID: 16241752 DOI: 10.1103/physrevlett.95.157001] [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: 07/04/2004] [Revised: 03/30/2005] [Indexed: 05/05/2023]
Abstract
Muon spin relaxation measurements in high transverse magnetic fields [FORMULA: SEE TEXT] revealed strong field-induced quasistatic magnetism in the underdoped and Eu-doped (La,Sr)2CuO4 and La1.875Ba0.125CuO4, existing well above Tc and TN. The susceptibility counterpart of Cu spin polarization, derived from the muon spin relaxation rate, exhibits a divergent behavior towards T approximately 25 K. No field-induced magnetism was detected in overdoped La1.81Sr0.19CuO4, optimally doped Bi2212, and Zn-doped YBa2Cu3O7.
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Affiliation(s)
- A T Savici
- Department of Physics, Columbia University, New York, New York 10027, USA
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18
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Keren A, Gardner JS, Ehlers G, Fukaya A, Segal E, Uemura YJ. Dynamic properties of a diluted pyrochlore cooperative paramagnet (Tb(p)Y(1-p))2Ti2O7. Phys Rev Lett 2004; 92:107204. [PMID: 15089239 DOI: 10.1103/physrevlett.92.107204] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2003] [Indexed: 05/24/2023]
Abstract
Investigations of the spin dynamics of the geometrically frustrated pyrochlore (Tb(p)Y(1-p))2Ti2O7, using muon spin relaxation and neutron spin echo, as a function of magnetic coverage p, have been carried out. Our major finding is that paramagnetic fluctuations prevail as T-->0 for all values of p, and that they are sensitive to dilution, indicating a cooperative spin motion. However, the percolation threshold pc is not a critical point for the fluctuations. We also find that the low temperature spectral density has a 1/f behavior, and that dilution slows down the spin fluctuations.
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Affiliation(s)
- A Keren
- Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel
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Fukaya A, Fudamoto Y, Gat IM, Ito T, Larkin MI, Savici AT, Uemura YJ, Kyriakou PP, Luke GM, Rovers MT, Kojima KM, Keren A, Hanawa M, Hiroi Z. Muon spin relaxation and susceptibility studies of the pure and diluted spin 1/2 kagomé-like lattice system (CuxZn(1-x))3V2O7(OH2) 2H2O. Phys Rev Lett 2003; 91:207603. [PMID: 14683396 DOI: 10.1103/physrevlett.91.207603] [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: 03/07/2003] [Indexed: 05/24/2023]
Abstract
Muon spin relaxation and magnetic susceptibility measurements have been performed on the pure and diluted spin 1/2 kagomé system (CuxZn(1-x))3V2O7(OH)2 2H2O. In the pure x=1 system we found a slowing down of Cu spin fluctuations with decreasing temperature towards T approximately 1 K, followed by slow and nearly temperature-independent spin fluctuations persisting down to T=50 mK, indicative of quantum fluctuations. No indication of static spin freezing was detected in either of the pure (x=1.0) or diluted samples. The observed magnitude of fluctuating fields indicates that the slow spin fluctuations represent an intrinsic property of kagomé network rather than impurity spins.
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Affiliation(s)
- A Fukaya
- Physics Department, Columbia University, 538 West 120th Street, New York, New York 10027, USA
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Gat-Malureanu IM, Fukaya A, Larkin MI, Millis AJ, Russo PL, Savici AT, Uemura YJ, Kyriakou PP, Luke GM, Wiebe CR, Sushko YV, Heffner RH, MacLaughlin DE, Andreica D, Kalvius GM. Field dependence of the muon spin relaxation rate in MnSi. Phys Rev Lett 2003; 90:157201. [PMID: 12732065 DOI: 10.1103/physrevlett.90.157201] [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: 07/24/2002] [Indexed: 05/24/2023]
Abstract
Muon spin rotation/relaxation measurements have been performed in the itinerant helical magnet MnSi at ambient pressure and at 8.3 kbar. We have found the following: (a) the spin-lattice relaxation rate 1/T(1) shows divergence as T1T proportional, variant (T-T(c))(beta) with the power beta larger than 1 near T(c); (b) 1/T(1) is strongly reduced in an applied external field B(L) and the divergent behavior near T(c) is completely suppressed at B(L)> or =4000 G. We discuss that (a) is consistent with the self-consistent renormalization theory and reflects a departure from "mean-field" behavior, while (b) indicates selective suppression of spin fluctuations of the q=0 component by B(L).
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Larkin MI, Fudamoto Y, Gat IM, Kinkhabwala A, Kojima KM, Luke GM, Merrin J, Nachumi B, Uemura YJ, Azuma M, Saito T, Takano M. Crossover from dilute to majority spin freezing in two leg ladder system Sr(Cu,Zn)2O3. Phys Rev Lett 2000; 85:1982-1985. [PMID: 10970663 DOI: 10.1103/physrevlett.85.1982] [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: 09/15/1999] [Revised: 03/16/2000] [Indexed: 05/23/2023]
Abstract
Muon spin relaxation has been measured in Sr(Cu1-xZnx)2O3. The results for low Zn concentration x</=0.6% are consistent with freezing of dilute moments, with one Cu spin for each Zn, having approximately 0.5&mgr;(B) frozen moment. A sharp increase of the relaxation rate at T-->0 occurred with increasing x around x approximately 0.8%, accompanied by a change of line shape to that expected in a concentrated magnetic environment. Analyses of the results for x>/=0.8% suggest that the majority of Cu moments participate in spin freezing, yet with a significantly reduced and spatially inhomogeneous moment size having a 1D correlation length xi approximately 6 lattice units, or a 2D correlation area involving approximately 19 Cu spins.
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Affiliation(s)
- MI Larkin
- Physics Department, Columbia University, New York, New York 10027, USA
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22
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Keren A, Uemura YJ, Luke G, Mendels P, Mekata M, Asano T. Magnetic dilution in the geometrically frustrated SrCr(9p)Ga(12-9p)O19 and the role of local dynamics: A muon spin relaxation study. Phys Rev Lett 2000; 84:3450-3453. [PMID: 11019112 DOI: 10.1103/physrevlett.84.3450] [Citation(s) in RCA: 6] [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: 07/12/1999] [Indexed: 05/23/2023]
Abstract
We investigate the spin dynamics of SrCr(9p)Ga(12-9p)O19 for p below and above the percolation threshold p(c) using muon spin relaxation. Our major findings are as follows: (i) At T-->0 the relaxation rate is T independent and approximately p(3), (ii) the slowing down of spin fluctuation is activated with an energy U, which is also a linear function of p(3) and lim U as p-->0 = 8 K; this energy scale could stem only from a single ion anisotropy, and (iii) the p dependence of the dynamical properties is identical below and above p(c), indicating that they are controlled by local excitation.
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Affiliation(s)
- A Keren
- Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel
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23
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Nachumi B, Keren A, Kojima K, Larkin M, Luke GM, Merrin J, Tchernyshöv O, Uemura YJ, Ichikawa N, Goto M, Uchida S. Muon Spin Relaxation Studies of Zn-Substitution Effects in High-Tc Cuprate Superconductors. Phys Rev Lett 1996; 77:5421-5424. [PMID: 10062799 DOI: 10.1103/physrevlett.77.5421] [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: 05/23/2023]
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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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Le LP, Heffner RH, MacLaughlin DE, Kojima K, Luke GM, Nachumi B, Uemura YJ, Sarrao JL, Fisk Z. Magnetic behavior in Li-doped La2CuO4. Phys Rev B Condens Matter 1996; 54:9538-9541. [PMID: 9984695 DOI: 10.1103/physrevb.54.9538] [Citation(s) in RCA: 13] [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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Heffner RH, Le LP, Hundley MF, Neumeier JJ, Luke GM, Kojima K, Nachumi B, Uemura YJ, MacLaughlin DE, Cheong SW. Ferromagnetic Ordering and Unusual Magnetic Ion Dynamics in La0.67Ca0.33MnO3. Phys Rev Lett 1996; 77:1869-1872. [PMID: 10063192 DOI: 10.1103/physrevlett.77.1869] [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: 05/23/2023]
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Takigawa M, Asano T, Ajiro Y, Mekata M, Uemura YJ. Dynamics in the S=1 one-dimensional antiferromagnet AgVP2S6 via 31P and 51V NMR. Phys Rev Lett 1996; 76:2173-2176. [PMID: 10060624 DOI: 10.1103/physrevlett.76.2173] [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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Keren A, Kojima K, Le LP, Luke GM, Wu WD, Uemura YJ, Takano M, Dabkowska H, Gingras MJ. Muon-spin-rotation measurements in the kagomé lattice systems: Cr-jarosite and Fe-jarosite. Phys Rev B Condens Matter 1996; 53:6451-6454. [PMID: 9982044 DOI: 10.1103/physrevb.53.6451] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [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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Uemura YJ, Kojima K, Luke GM, Wu WD, Oszlanyi G, Chauvet O, Forro L. Static magnetic order in the one-dimensional conductor RbC60. Phys Rev B Condens Matter 1995; 52:R6991-R6994. [PMID: 9979732 DOI: 10.1103/physrevb.52.r6991] [Citation(s) in RCA: 19] [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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Kojima K, Keren A, Le LP, Luke GM, Nachumi B, Wu WD, Uemura YJ, Kiyono K, Miyasaka S, Takagi H, Uchida S. Muon Spin Relaxation and Magnetic Susceptibility Measurements in the Haldane System Y2-xCax)Ba(Ni1-yMgy)O5. Phys Rev Lett 1995; 74:3471-3474. [PMID: 10058209 DOI: 10.1103/physrevlett.74.3471] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [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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31
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Kojima K, Keren A, Luke GM, Nachumi B, Wu WD, Uemura YJ, Azuma M, Takano M. Magnetic Behavior of the 2-Leg and 3-Leg Spin Ladder Cuprates Srn-1Cun+1O2n. Phys Rev Lett 1995; 74:2812-2815. [PMID: 10058024 DOI: 10.1103/physrevlett.74.2812] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [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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32
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Uemura YJ, Keren A, Kojima K, Le LP, Luke GM, Wu WD, Ajiro Y, Asano T, Kuriyama Y, Mekata M, Kikuchi H, Kakurai K. Spin fluctuations in frustrated kagomé lattice system SrCr8Ga4O19 studied by muon spin relaxation. Phys Rev Lett 1994; 73:3306-3309. [PMID: 10057343 DOI: 10.1103/physrevlett.73.3306] [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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33
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Luke GM, Keren A, Kojima K, Le LP, Sternlieb BJ, Wu WD, Uemura YJ, Onuki Y, Komatsubara T. Competition between magnetic order and superconductivity in CeCu2.2Si2. Phys Rev Lett 1994; 73:1853-1856. [PMID: 10056903 DOI: 10.1103/physrevlett.73.1853] [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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34
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Wu WD, Keren A, Le LP, Luke GM, Sternlieb BJ, Uemura YJ, Seaman CL, Dalichaouch Y, Maple MB. Muon spin relaxation studies of magnetic order in Y1-xUxPd3 and UPd4. Phys Rev Lett 1994; 72:3722-3725. [PMID: 10056273 DOI: 10.1103/physrevlett.72.3722] [Citation(s) in RCA: 4] [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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35
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Keren A, Le LP, Luke GM, Sternlieb BJ, Wu WD, Uemura YJ, Tajima S, Uchida S. Muon-spin-rotation measurements in infinite-layer and infinite-chain cuprate antiferromagnets: Ca0.86Sr0.14CuO2 and Sr2CuO3. Phys Rev B Condens Matter 1993; 48:12926-12935. [PMID: 10007668 DOI: 10.1103/physrevb.48.12926] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [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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36
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Le LP, Keren A, Luke GM, Sternlieb BJ, Wu WD, Uemura YJ, Brewer JH, Riseman TM, Upasani RV, Chiang LY, Kang W, Chaikin PM, Csiba T, Grüner G. Muon-spin-rotation and relaxation studies in (TMTSF)2-X compounds. Phys Rev B Condens Matter 1993; 48:7284-7296. [PMID: 10006896 DOI: 10.1103/physrevb.48.7284] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.4] [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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37
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Luke GM, Keren A, Le LP, Wu WD, Uemura YJ, Bonn DA, Taillefer L, Garrett JD. Muon spin relaxation in UPt3. Phys Rev Lett 1993; 71:1466-1469. [PMID: 10055547 DOI: 10.1103/physrevlett.71.1466] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.6] [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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38
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Uemura YJ, Keren A, Le LP, Luke GM, Wu WD, Kubo Y, Manako T, Shimakawa Y, Subramanian M, Cobb JL, Markert JT. Magnetic-field penetration depth in TI2Ba2CuO6+δ in the overdoped regime. Nature 1993. [DOI: 10.1038/364605a0] [Citation(s) in RCA: 195] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Wu WD, Keren A, Le LP, Sternlieb BJ, Luke GM, Uemura YJ, Dosanjh P, Riseman TM. Muon-spin-relaxation studies of flux pinning in Bi2Sr2CaCu2O8 and Pb0.7Bi1.3Sr2CaCu2O8. Phys Rev B Condens Matter 1993; 47:8172-8186. [PMID: 10004830 DOI: 10.1103/physrevb.47.8172] [Citation(s) in RCA: 13] [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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40
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Mekata M, Yaguchi N, Kuriyama H, Asano T, Nagamine K, Keren A, Le LP, Luke GM, Wu WD, Uemura YJ. ?+SR study of two-dimensional antiferromagnets, delafossite-type compounds. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf00568168] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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41
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Le LP, Luke GM, Sternlieb BJ, Wu WD, Uemura YJ, Brewer JH, Riseman TM, Stronach CE, Saito G, Yamochi H, Wang HH, Kini AM, Carlson KD, Williams JM. Muon-spin-relaxation measurements of magnetic penetration depth in organic superconductors (BEDT-TTF)2-X: X=Cu(NCS)2 and Cu. Phys Rev Lett 1992; 68:1923-1926. [PMID: 10045255 DOI: 10.1103/physrevlett.68.1923] [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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42
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Uemura YJ, Le LP, Luke GM, Sternlieb BJ, Wu WD, Brewer JH, Riseman TM, Seaman CL, Maple MB, Ishikawa M, Hinks DG, Jorgensen JD, Saito G, Yamochi H. Basic similarities among cuprate, bismuthate, organic, Chevrel-phase, and heavy-fermion superconductors shown by penetration-depth measurements. Phys Rev Lett 1991; 66:2665-2668. [PMID: 10043580 DOI: 10.1103/physrevlett.66.2665] [Citation(s) in RCA: 95] [Impact Index Per Article: 2.9] [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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43
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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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44
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Sternlieb BJ, Luke GM, Uemura YJ, Riseman TM, Brewer JH, Gehring PM, Yamada K, Hidaka Y, Murakami T, Thurston TR, Birgeneau RJ. Erratum: Muon-spin-relaxation and neutron-scattering studies of magnetism in single-crystal La1.94Sr0.06CuO4. Phys Rev B Condens Matter 1990; 42:6745. [PMID: 9994774 DOI: 10.1103/physrevb.42.6745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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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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Le LP, Luke GM, Sternlieb BJ, Uemura YJ, Brewer JH, Riseman TM, Johnston DC, Miller LL. Muon-spin-rotation studies in single-crystal Sr2CuO2Cl2. Phys Rev B Condens Matter 1990; 42:2182-2187. [PMID: 9995663 DOI: 10.1103/physrevb.42.2182] [Citation(s) in RCA: 15] [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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47
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Sternlieb BJ, Luke GM, Uemura YJ, Riseman TM, Brewer JH, Gehring PM, Yamada K, Hidaka Y, Murakami T, Thurston TR, Birgeneau RJ. Muon-spin-relaxation and neutron-scattering studies of magnetism in single-crystal La1.94Sr0.06CuO4. Phys Rev B Condens Matter 1990; 41:8866-8871. [PMID: 9993225 DOI: 10.1103/physrevb.41.8866] [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: 04/12/2023]
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48
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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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49
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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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50
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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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