Imperial College London
Portrait Picture

Professor Lesley F Cohen

Faculty of Natural Sciences, Department of Physics

Associate Provost (Equality, Diversity and Inclusion)
 
 
 
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Contact

 

+44 (0)20 7594 7598l.cohen Website CV

 
 
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Assistant

 

Mrs Carolyn Dale +44 (0)20 7594 7579

 
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Location

 

1111Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

450 results found

Cowie A, Cohen LF, Denhoff MW, 1999, The microwave power handling of an FIB-generated weak link in a YBCO film, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 12, Pages: 431-435, ISSN: 0953-2048

Journal article

Gibson G, Humphreys RG, Cohen LF, MacManus-Driscoll JLet al., 1999, Influence of growth temperature & composition on structural disorder in YBCO thin films, 1998 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 1848-1851, ISSN: 1051-8223

Conference paper

Booth JC, Beall JA, Rudman DA, Vale LR, Ono RH, Holloway CL, Qadri SB, Osofsky MS, Skelton EF, Claassen JH, Gibson G, MacManus-Driscoll JL, Malde N, Cohen LFet al., 1999, Simultaneous optimization of the linear and nonlinear microwave response of YBCO films and devices, 1998 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 4176-4180, ISSN: 1051-8223

Conference paper

Rudman DA, Stork FJB, Booth JC, Juang JY, Vale LR, Beatty GJ, Williams CI, Beall JA, Ono RH, Qadri SB, Osofsky MS, Skelton EF, Claassen JH, Gibson G, MacManus-Driscoll JL, Malde N, Cohen LFet al., 1999, Role of oxygen pressure during deposition on the microwave properties of YBCO films, 1998 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 2460-2464, ISSN: 1051-8223

Conference paper

Hossain AKMA, Cohen LF, Kodenkandeth T, MacManus-Driscoll J, Alford NMet al., 1999, Influence of oxygen vacancies on magnetoresistance properties of bulk La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3-δ</sub>, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol: 195, Pages: 31-36, ISSN: 0304-8853

Journal article

Thomas JV, Perkins GK, Lacey DE, Totty JT, Cohen LF, Caplin AD, Zhukov AA, Voronkova VIet al., 1999, Influence of oxygen deficiency on anisotropy and <i>c</i>-axis critical current densities in TmBa<sub>2</sub>Cu<sub>3</sub>O<sub>y</sub> single crystals, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 12, Pages: 135-141, ISSN: 0953-2048

Journal article

Akther Hossain AKM, Cohen LF, Damay F, Berenov A, MacManus-Driscoll J, Alford NM, Mathur ND, Blamire MG, Evetts JEet al., 1999, Influence of grain size on magnetoresistance properties of bulk La<inf>0.67</inf>Ca<inf>0.33</inf>MnO<inf>3-δ</inf>, Journal of Magnetism and Magnetic Materials, Vol: 192, Pages: 263-270, ISSN: 0304-8853

The magnetic and magnetoresistive properties of six polycrystalline bulk samples of nominal chemical composition La0.67Ca0.33MnO3-δ and varying grain size (3.3 μm-20.4 μm), were investigated. Although the Curie temperature, Tc, is independent of grain size, the variation of the saturation magnetisation with grain size depends on the magnetic history. At 20 K and 8 T applied field, the magnetisation decreases as the grain size increases. An approximate linear variation of resistivity and magnetoresistivity with grain size allows the use of a simple 1D model to extract the intrinsic grain magnetoresistance for these materials at Tc and to separate the grain and grain boundary resistivity contributions. The relationship between resistivity and magnetisation is discussed. © 1999 Elsevier Science B.V.

Journal article

Hossain AKMA, Cohen LF, Damay F, Berenov A, MacManus-Driscoll J, Alford NM, Mathur ND, Blamire M, Evetts JEet al., 1999, Influence of grain size on magnetoresistance properties of bulk La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3-δ</sub>, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol: 192, Pages: 263-270, ISSN: 0304-8853

Journal article

Blamire MG, Teo BS, Durrell JH, Mathur ND, Barber ZH, Driscoll JLM, Cohen LF, Evetts JEet al., 1999, Strain-induced time-dependent magnetic disorder in ultra-thin La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> films, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol: 191, Pages: 359-367, ISSN: 0304-8853

Journal article

Ghivelder L, Castillo IA, Alford NM, Tomka GJ, Riedi PC, MacManus-Driscoll J, Hossain AKMA, Cohen LFet al., 1998, Specific heat of La<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3-δ</sub>, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol: 189, Pages: 274-282, ISSN: 0304-8853

Journal article

Thomas KA, de Silva PSIPN, Cohen LF, Hossain A, Rajeswari M, Venkatesan T, Hiskes R, MacManus-Driscoll JLet al., 1998, Influence of strain and microstructure on magnetotransport in La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> thin films, JOURNAL OF APPLIED PHYSICS, Vol: 84, Pages: 3939-3948, ISSN: 0021-8979

Journal article

Zhukov AA, Perkins GK, Cohen LF, Caplin AD, Kupfer H, Wolf T, Wirth Get al., 1998, Narrow dip in the angular dependence of the irreversible magnetic moment in columnar-defected YBa<sub>2</sub>Cu<sub>3</sub>O<sub>y</sub> single crystals, PHYSICAL REVIEW B, Vol: 58, Pages: 8820-8825, ISSN: 1098-0121

Journal article

Totty JT, Perkins GK, Jensen HJ, Doyle RA, Cohen LFet al., 1998, Comparison of dynamic relaxation in columnar defected and virgin Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8</sub> crystals, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 11, Pages: 866-874, ISSN: 0953-2048

Journal article

Cohen LF, de Silva PSIPN, Malde N, Hossain AKMA, Thomas KA, Chater R, MacManus-Driscoll JD, Tate T, Mathur ND, Blamire MG, Evetts JEet al., 1998, Reentrant metal-insulator-type transition induced by high fluence chromium ion implantation of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> thin films, APPLIED PHYSICS LETTERS, Vol: 73, Pages: 1005-1007, ISSN: 0003-6951

Journal article

Li YH, Thomas KA, de Silva PSIPN, Cohen LF, Goyal A, Rajeswari M, Mathur ND, Blamire MG, Evetts JE, Venkatesan T, MacManus-Driscoll JLet al., 1998, Transmission electron microscopy and x-ray structural investigation of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> thin films, JOURNAL OF MATERIALS RESEARCH, Vol: 13, Pages: 2161-2169, ISSN: 0884-2914

Journal article

Evetts JE, Blamire MG, Mathur ND, Isaac SP, Teo BS, Cohen LF, Macmanus-Driscoll JLet al., 1998, Defect-induced spin disorder and magnetoresistance in single-crystal and polycrystal rare-earth manganite thin films, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 356, Pages: 1593-1613, ISSN: 1364-503X

Journal article

Malde N, de Silva PSIPN, Hossain AKMA, Cohen LF, Thomas KA, MacManus-Driscoll JL, Mathur ND, Blamire MGet al., 1998, Influence of oxygen stoichiometry on Raman phonon spectroscopy, lattice parameters and physical properties of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> thin films, SOLID STATE COMMUNICATIONS, Vol: 105, Pages: 643-648, ISSN: 0038-1098

Journal article

de Silva PSIPN, Richards FM, Cohen LF, Alonso JA, Martinez-Lope MJ, Casais MT, Thomas KA, MacManus-Driscoll JLet al., 1998, Effects of high vacancy concentrations on the magnetic properties of La<sub>1-x</sub>Mn<sub>1-y</sub>O<sub>3</sub> (0.02≤x, y≤0.13), JOURNAL OF APPLIED PHYSICS, Vol: 83, Pages: 394-399, ISSN: 0021-8979

Journal article

De Silva PSIPN, Malde N, Hossain AKMA, Cohen LF, Thomas KA, Chater R, MacManus-Driscoll JD, Tate TJ, Mathur ND, Blamire MG, Evetts JEet al., 1998, Effects of chromium ion implantation on the magneto-transport properties of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> thin films, Symposium on Metallic Magnetic Oxides at the Materials-Research-Society Fall Meeting, Publisher: MATERIALS RESEARCH SOCIETY, Pages: 323-328, ISSN: 0272-9172

Conference paper

Cohen LF, Jensen HJ, 1997, Open questions in the magnetic behaviour of high-temperature superconductors, REPORTS ON PROGRESS IN PHYSICS, Vol: 60, Pages: 1581-1672, ISSN: 0034-4885

Journal article

Ghosh IS, Cohen LF, Gallop JC, 1997, The field dependence of the microwave vortex pinning parameters: evidence for collective pinning effects and unconventional frictional damping, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 10, Pages: 936-943, ISSN: 0953-2048

Journal article

Alonso JA, MartinezLope MJ, Casais MT, MacManusDriscoll JL, deSilva PSIPN, Cohen LF, FernandezDiaz MTet al., 1997, Non-stoichiometry, structural defects and properties of LaMnO3+delta with high delta values (0.1<=delta<=0.29), JOURNAL OF MATERIALS CHEMISTRY, Vol: 7, Pages: 2139-2144, ISSN: 0959-9428

Journal article

Gallop JC, Cowie A, Cohen LF, 1997, Variation in microwave losses induced by dc and rf magnetic fields in HTS thin films, International Conference on Materials and Mechanisms of Superconductivity - High Temperature Superconductors V, Publisher: ELSEVIER SCIENCE BV, Pages: 1577-1578, ISSN: 0921-4534

Conference paper

Perkins GK, Zhukov AA, Bugoslavsky YV, Cohen LF, Caplin AD, Wolf Tet al., 1997, Anomalous behaviour of vortex creep in twinned YBCO crystals, International Conference on Materials and Mechanisms of Superconductivity - High Temperature Superconductors V, Publisher: ELSEVIER SCIENCE BV, Pages: 2235-2236, ISSN: 0921-4534

Conference paper

Zhukov AA, Perkins GK, Bugoslavsky Y, Totty J, Cohen LF, Caplin AD, Kupfer H, Wolf T, Wirth Get al., 1997, Vortex lock-in by columnar defects in YBa2Cu3Oy single crystals, International Conference on Materials and Mechanisms of Superconductivity - High Temperature Superconductors V, Publisher: ELSEVIER SCIENCE BV, Pages: 2155-2156, ISSN: 0921-4534

Conference paper

Cohen LF, Zhukov AA, Perkins GK, Totty J, Caplin AD, Kupfer H, Wolf TH, Wirth Get al., 1997, Effect of columnar defects on the vortex dynamics in a twinned YBCO 123 crystal, International Conference on Materials and Mechanisms of Superconductivity - High Temperature Superconductors V, Publisher: ELSEVIER SCIENCE BV, Pages: 2227-2228, ISSN: 0921-4534

Conference paper

Perkins GK, Zhukov AA, Bugoslavsky YV, Cohen LF, Wolf T, Klaser M, Caplin ADet al., 1997, The effect of twin plane boundaries on the vortex dynamics in twinned YBCO crystals, International Conference on Materials and Mechanisms of Superconductivity - High Temperature Superconductors V, Publisher: ELSEVIER SCIENCE BV, Pages: 2149-2150, ISSN: 0921-4534

Conference paper

Totty JT, Cohen LF, Perkins GK, Kadowaki K, Wirth G, Paul DM, Balakrishnan Get al., 1997, Effect of columnar defects on the vortex dynamics in BSCCO 2212 single crystals, International Conference on Materials and Mechanisms of Superconductivity - High Temperature Superconductors V, Publisher: ELSEVIER SCIENCE BV, Pages: 2187-2188, ISSN: 0921-4534

Conference paper

Cohen LF, Cowie A, Gallop JC, Ghosh IS, Chrosch J, Goncharov INet al., 1997, Variation of microwave losses induced by dc and rf magnetic fields in Gd123 thin films, 1996 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 1291-1294, ISSN: 1051-8223

Conference paper

Gibson G, MacManusDriscoll JL, Cohen LF, 1997, Raman microscopy as a local probe of structural defects and oxygen content in HTS thin films, 1996 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 2130-2133, ISSN: 1051-8223

Conference paper

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