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Observation of structures of chain vortices inside anisotropic high- Tc superconductors. PHYSICAL REVIEW LETTERS 2002; 88:237001. [PMID: 12059390 DOI: 10.1103/physrevlett.88.237001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2002] [Indexed: 05/23/2023]
Abstract
In order to elucidate the formation mechanism of unconventional arrangements of vortices in high- Tc superconducting thin films at an inclined magnetic field to the layer plane, we investigated the structures of vortex lines inside the films by Lorentz microscopy using our 1-MV field-emission electron microscope. Our observation results concluded that vortex lines are tilted to form linear chains in YBaCu3O(7,8). Vortex lines in the chain-lattice state in Bi2Sr2CaCu2O(8+delta), on the other hand, are all perpendicular to the layer plane, and therefore only vortices lined up along Josephson vortices form chains.
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2
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Direct observation of spontaneous weak ferromagnetism in the superconductor ErNi2B2C. PHYSICAL REVIEW LETTERS 2001; 87:107001. [PMID: 11531497 DOI: 10.1103/physrevlett.87.107001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2001] [Indexed: 05/23/2023]
Abstract
Neutron measurements show that superconducting ErNi2B2C (T(C) = 11 K) develops antiferromagnetic spin density wave magnetic order (T(N) = 6 K), which squares up with decreasing temperature yielding a series of higher-order magnetic Bragg peaks with odd harmonics. Below T(WFM) = 2.3 K where magnetization indicates a net moment develops, even-order Bragg peaks develop which low field (approximately 3 Oe) polarized beam measurements show are magnetic in origin. The data directly demonstrate the existence of a net magnetization with a periodicity of 20a, confirming the microscopic coexistence of spontaneous weak ferromagnetism with superconductivity.
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3
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Temperature dependence of the flux line lattice transition into square symmetry in superconducting LuNi2B2C. PHYSICAL REVIEW LETTERS 2001; 86:5148-5151. [PMID: 11384443 DOI: 10.1103/physrevlett.86.5148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2000] [Indexed: 05/23/2023]
Abstract
We have investigated the temperature dependence of the H parallel to c flux line lattice structural phase transition from square to hexagonal symmetry, in the tetragonal superconductor LuNi2B2C ( T(c) = 16.6 K). At temperatures below 10 K the transition onset field, H2(T), is only weakly temperature dependent. Above 10 K, H2(T) rises sharply, bending away from the upper critical field. This contradicts theoretical predictions of H2(T) merging with the upper critical field and suggests that just below the H(c2)(T) curve the flux line lattice might be hexagonal.
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Flux line lattice reorientation in the borocarbide superconductors with H parallel a. PHYSICAL REVIEW LETTERS 2001; 86:320-323. [PMID: 11177821 DOI: 10.1103/physrevlett.86.320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2000] [Indexed: 05/23/2023]
Abstract
Small angle neutron scattering studies of the flux line lattice in LuNi2B2C and ErNi2B2C induced by a field parallel to the a axis reveal a first order flux line lattice reorientation transition. Below the transition the flux line lattice nearest neighbor direction is parallel to the b axis, and above the transition it is parallel to the c axis. This transition cannot be explained using nonlocal corrections to the London model. In addition, the anisotropy of the penetration depth lambda and the coherence length xi change at the transition.
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6
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Instabilities and disorder-driven first-order transition of the vortex lattice. PHYSICAL REVIEW LETTERS 2000; 85:3712-3715. [PMID: 11030988 DOI: 10.1103/physrevlett.85.3712] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2000] [Indexed: 05/23/2023]
Abstract
Transport studies in a Corbino disk suggest that the Bragg glass phase undergoes a first-order transition into a disordered solid. This transition shows sharp reentrant behavior at low fields. In contrast, in the conventional strip configuration, the phase transition is obscured by the injection of the disordered vortices through the sample edges, which results in the commonly observed vortex instabilities and smearing of the peak effect in NbSe2 crystals. These features are found to be absent in the Corbino geometry in which the circulating vortices do not cross the sample edges.
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7
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Enhanced critical currents of superconducting ErNi2B2C in the ferromagnetically ordered state. PHYSICAL REVIEW LETTERS 2000; 84:2497-2500. [PMID: 11018919 DOI: 10.1103/physrevlett.84.2497] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/1999] [Indexed: 05/23/2023]
Abstract
We report on transport and magnetization studies of the critical current in single crystal ErNi2B2C for applied fields below 4 kG. Below T approximately 2.5 K superconductivity coexists with weak ferromagnetism. We find that the critical currents are strongly enhanced for all field orientations in this ferromagnetic regime, corresponding to a threefold increase of the pinning force of the flux line lattice. We speculate that this increase is due to strong pair breaking by the ferromagnetism.
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Abstract
A silicon micromechanical magnetometer was constructed and successfully used in 60-tesla pulsed magnetic fields of less than 100-millisecond duration. The device is small, inexpensive to fabricate, and easy to use. It features a fast mechanical response (up to 50,000 hertz) and extremely high sensitivity yet is relatively robust against electrical and mechanical noise. Quantum oscillations in the magnetization of a 1-microgram sample of an organic superconductor, kappa-[bis(ethylenedithio)tetrathiafulvalene]2Cu(NCS)2, have been observed with this device.
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9
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Evidence of surface superconductivity in 2H-NbSe2 single crystals. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:6583-6586. [PMID: 9986676 DOI: 10.1103/physrevb.54.6583] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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10
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Dynamically induced disorder in the vortex lattice of 2H-NbSe2. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:11336-11339. [PMID: 9982746 DOI: 10.1103/physrevb.53.11336] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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11
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Thermodynamic and electron diffraction signatures of charge and spin ordering in La1- xCaxMnO3. PHYSICAL REVIEW LETTERS 1996; 76:3188-3191. [PMID: 10060897 DOI: 10.1103/physrevlett.76.3188] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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12
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Charge modulation in La1.67Sr0.33NiO4: A bulk thermodynamic study. PHYSICAL REVIEW LETTERS 1996; 76:447-450. [PMID: 10061459 DOI: 10.1103/physrevlett.76.447] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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13
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Vortex-motion-induced voltage noise in YBa2Cu3O7- delta single crystals. PHYSICAL REVIEW LETTERS 1995; 75:3521-3524. [PMID: 10059607 DOI: 10.1103/physrevlett.75.3521] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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14
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Yaron et al. reply. PHYSICAL REVIEW LETTERS 1995; 75:3373. [PMID: 10059568 DOI: 10.1103/physrevlett.75.3373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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15
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López et al. reply. PHYSICAL REVIEW LETTERS 1995; 75:2447. [PMID: 10059308 DOI: 10.1103/physrevlett.75.2447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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16
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Vortex dynamics below the flux-lattice melting transition in YBa2Cu3O7- delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:6211-6214. [PMID: 9981846 DOI: 10.1103/physrevb.52.6211] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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17
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Observation of magnetic-field penetration via dendritic growth in superconducting niobium films. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:75-78. [PMID: 9979573 DOI: 10.1103/physrevb.52.75] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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18
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Role of twin boundaries in the magnetic flux penetration in YBa2Cu3O7- delta. PHYSICAL REVIEW LETTERS 1995; 74:3712. [PMID: 10058277 DOI: 10.1103/physrevlett.74.3712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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19
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Frustration induced spin freezing in a site-ordered magnet: Gadolinium gallium garnet. PHYSICAL REVIEW LETTERS 1995; 74:2379-2382. [PMID: 10057913 DOI: 10.1103/physrevlett.74.2379] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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20
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Comment on "Vortex dynamics and melting in niobium". PHYSICAL REVIEW LETTERS 1995; 74:1697. [PMID: 10059097 DOI: 10.1103/physrevlett.74.1697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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21
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Neutron diffraction studies of flowing and pinned magnetic flux lattices in 2H-NbSe2. PHYSICAL REVIEW LETTERS 1994; 73:2748-2751. [PMID: 10057182 DOI: 10.1103/physrevlett.73.2748] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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22
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Observation of a nonlocal conductivity in the mixed state of YBa2Cu3O7- delta : Experimental evidence for a vortex line liquid. PHYSICAL REVIEW LETTERS 1994; 72:1272-1275. [PMID: 10056666 DOI: 10.1103/physrevlett.72.1272] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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23
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Direct magneto-optical measurements of anisotropic critical currents in (La1-xSrx)2CuO4 single crystals. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:3608-3611. [PMID: 10011236 DOI: 10.1103/physrevb.49.3608] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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24
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Small angle neutron scattering study of the magnetic flux-line lattice in single crystal 2H-NbSe2. PHYSICAL REVIEW LETTERS 1994; 72:278-281. [PMID: 10056104 DOI: 10.1103/physrevlett.72.278] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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25
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Observation of tilt induced orientational order in the magnetic flux lattice in 2H-NbSe2. PHYSICAL REVIEW LETTERS 1993; 71:4039-4042. [PMID: 10055138 DOI: 10.1103/physrevlett.71.4039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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26
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Experimental evidence for a multicritical point in the magnetic phase diagram for the mixed state of clean untwinned YBa2Cu3O7. PHYSICAL REVIEW LETTERS 1993; 70:3800-3803. [PMID: 10053965 DOI: 10.1103/physrevlett.70.3800] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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27
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Observation of a novel vortex structure driven by magnetic interactions near a sawtooth twin boundary in YBa2Cu3O7- delta. PHYSICAL REVIEW LETTERS 1992; 69:3808-3811. [PMID: 10046919 DOI: 10.1103/physrevlett.69.3808] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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28
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Observation of two-dimensional vortices in Bi2Sr2CaCu2Ox. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:14238-14241. [PMID: 10003506 DOI: 10.1103/physrevb.46.14238] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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29
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Experimental evidence for a first-order vortex-lattice-melting transition in untwinned, single crystal YBa2Cu3O7. PHYSICAL REVIEW LETTERS 1992; 69:824-827. [PMID: 10047042 DOI: 10.1103/physrevlett.69.824] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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30
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Images of the vortex chain state in untwinned YBa2Cu3O7- delta crystals. PHYSICAL REVIEW LETTERS 1992; 68:3343-3346. [PMID: 10045678 DOI: 10.1103/physrevlett.68.3343] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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31
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SQUID picovoltometry of single crystal Bi2Sr2CaCu2O8+ delta : Observation of the crossover from high-temperature Arrhenius to low-temperature vortex-glass behavior. PHYSICAL REVIEW LETTERS 1992; 68:2672-2675. [PMID: 10045458 DOI: 10.1103/physrevlett.68.2672] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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32
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Abstract
A variety of recent experiments on both the static and the dynamic properties of vortices and flux-line lattices in the mixed state of the copper oxide superconductors are discussed. The experiments are of two basic types: (i) experiments that image the magnetic flux patterns either with magnetic decoration or neutrons and give information about static structures, and (ii) experiments that explore the dynamics of vortices either through the resistivity or other electrodynamic responses of the material. Results of these experiments argue in favor of the existence of a true phase transition in the high-field vortex state from a low-temperature superconducting vortex glass phase into a disordered high-temperature vortex fluid phase. The vortex glass phase transition model does a good job of explaining high-precision measurements of the dynamics at the transition. At low fields and temperatures, very long range hexatic order in the flux-line lattice is observed.
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33
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Determination of Coulomb-blockade resistances and observation of the tunneling of single electrons in small-tunnel-junction circuits. PHYSICAL REVIEW LETTERS 1991; 67:3148-3151. [PMID: 10044653 DOI: 10.1103/physrevlett.67.3148] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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34
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Electrical and magnetic properties of Nb2O5- delta crystallographic shear structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:6973-6981. [PMID: 9998581 DOI: 10.1103/physrevb.44.6973] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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35
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Translational and bond-orientational order in the vortex lattice of the high-Tc superconductor Bi2.1Sr1.9Ca0.9Cu2O8+ delta. PHYSICAL REVIEW LETTERS 1991; 66:2270-2273. [PMID: 10043440 DOI: 10.1103/physrevlett.66.2270] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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36
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SQUID picovoltometry of YBa2Cu3O7 single crystals: Evidence for a finite-temperature phase transition in the high-field vortex state. PHYSICAL REVIEW LETTERS 1991; 66:953-956. [PMID: 10043949 DOI: 10.1103/physrevlett.66.953] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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37
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Observation of a commensurate array of flux chains in tilted flux lattices in Bi-Sr-Ca-Cu-O single crystals. PHYSICAL REVIEW LETTERS 1991; 66:112-115. [PMID: 10043155 DOI: 10.1103/physrevlett.66.112] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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38
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Nonsuperconducting BaSn1-xSbxO3: The 5s-orbital analog of BaPb1-xBixO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:4815-4818. [PMID: 9996029 DOI: 10.1103/physrevb.42.4815] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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39
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Observation of a hexatic vortex glass in flux lattices of the high-Tc superconductor Bi2.1Sr1.9Ca0.9Cu2O8+ delta. PHYSICAL REVIEW LETTERS 1990; 64:2312-2315. [PMID: 10041642 DOI: 10.1103/physrevlett.64.2312] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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40
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Little-Parks oscillations of Tc in patterned microstructures of the oxide superconductor YBa2Cu3O7: Experimental limits on fractional-statistics-particle theories. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:2593-2596. [PMID: 9994012 DOI: 10.1103/physrevb.41.2593] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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41
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Mechanical measurements of two-dimensional flux lattices: Observation of two-stage melting. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:7354-7356. [PMID: 9991143 DOI: 10.1103/physrevb.40.7354] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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42
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Observation of combined Josephson and charging effects in small tunnel junction circuits. PHYSICAL REVIEW LETTERS 1989; 63:1307-1310. [PMID: 10040529 DOI: 10.1103/physrevlett.63.1307] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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43
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Pair-breaking description of the vortex-depinning critical field in YBa2Cu3O7 thin films. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:5243-5246. [PMID: 9992541 DOI: 10.1103/physrevb.40.5243] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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44
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45
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Nonlinear temperature dependence of the normal-state resistivity in YBa2Cu4O8+/- delta films. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:9611-9613. [PMID: 9947705 DOI: 10.1103/physrevb.39.9611] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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46
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Mechanical measurements of the flux lattice in the heavy-fermion superconductor UPt sub 3. PHYSICAL REVIEW LETTERS 1989; 62:328-331. [PMID: 10040204 DOI: 10.1103/physrevlett.62.328] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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47
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Ultralow-temperature behavior of the nu =(5/2 fractional quantum Hall effect. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:10128-10130. [PMID: 9945858 DOI: 10.1103/physrevb.38.10128] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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48
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Evidence from mechanical measurements for flux-lattice melting in single crystals YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8. PHYSICAL REVIEW LETTERS 1988; 61:1666-1669. [PMID: 10038864 DOI: 10.1103/physrevlett.61.1666] [Citation(s) in RCA: 133] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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49
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Flux-lattice melting in amorphous composite In/InOx two-dimensional superconductors. PHYSICAL REVIEW LETTERS 1988; 60:144-147. [PMID: 10038220 DOI: 10.1103/physrevlett.60.144] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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50
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Observation of hexagonally correlated flux quanta in YBa2Cu. PHYSICAL REVIEW LETTERS 1987; 59:2592-2595. [PMID: 10035592 DOI: 10.1103/physrevlett.59.2592] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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