Contents

PREFACE xxv

ACKNOWLEDGMENTS xxvii

MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS xxix

PART I: PLENARY SESSION I

OXIDE SUPERCONDUCTORS: A CHEMIST'S VIEW 3 A.W. Sleight

NEUTRON DIFFRACTION STUDIES OF HIGH Tc SUPERCONDUCTORS 9 D.G. Hinks, B. Dabrowski, K. Zhang, C.U. Segre, J, D, Jorgensen, L, Soderholm, and M.A. Beno

Ba2YCu3O7_δ: EFFECT OF OXYGEN STOICHIOMETRY 19 R. J. Cava, B. Batlogg, A.P- Ramirez, D. Werder, C.H. Chen, E.A. Rietman, and S.M. Zahurak

THEORIES OF HIGH Tc SUPERCONDUCTORS 27 John Bardeen

PART II: PLENARY SESSION II

MATERIALS ASPECTS OF OXIDE SUPERCONDUCTORS―EFFECT OF AMBIENT WATER ON SUPERCONDUCTIVITY 33

K. Kitazawa, K. Kishio, T. Hasegawa, A. Ohtomo, S. Yaegashi, S. Kanbe, K. Park, K. Kuwahara, and K. Fueki

OXYGEN VACANCY ORDERING IN BaYCu3O7_x, 0

PART III: INVITED SESSION I

MAGNETISM, SPECIFIC HEAT, AND SURFACE TOPOGRAPHY OF OXIDE SUPERCONDUCTORS 71

H. Jenny, H. Bretscher, T. Frey, D. Anselmetti, H. Heinzelmann, R. Wiesendanger, G. Leemann, B. Walz, D. Sackinger, and H.-J. Guntherodt

THE EFFECTS OF OXYGEN STOICHIOMETRY AND OXYGEN ORDERING ON SUPERCONDUCTIVITY IN Y1Ba2Cu3O9-x 77

R. Beyers, E.M. Engler, P.M. Grant, S.S.P. Parkin, G. Lim, M.L. Ramirez, K.P. Roche, J.E. Vazquez, V.Y. Lee, R.D. Jacowitz, B.T. Ahn, T.M. Giir, and R.A. Huggins

HIGH-RESOLUTION X-RAY MICROSTRUCTURAL STUDY OF SINGLE CRYSTALS OF YBa2Cu3O7-y 83

Hoydoo You, J.D, Axe, X.B. Kan, S.C. Moss, J.Z. Liu, and D.J. Lam

EFFECT OF OXYGEN PRESSURE ON THE PHASE TRANSFORMATION IN THE Y-Ba-Cu-0 AND RELATED SUPERCONDUCTING OXIDES 89

Y. Kubo, Y. Nakabayashi, J. Tabuchi, T. Yoshitake, T. Manako, A- Ochi, K. Utsumi, H. Igarashi, and M. Yonezawa

THEORETICAL STUDIES OF COPPER OXIDE CLUSTERS: PREDICTION OF AN ELECTRONICALLY DRIVEN PHASE SEPARATION IN YBa2Cu3Ox 95

L.A. Curtiss, T.O. Brun, and D.M. Gruen

HIGH TEMPERATURE SUPERCONDUCTORS IN THE Lai+xBa2-xCu3Oy SYSTEM 101

E.M. McCarron III, C.C. Torardi, J.P. Attfield, K.J. Morrissey, A.W. Sleight, D.E. Cox, R.K. Bordia, W.E. Farneth, R.B. Flippen, M.A. Subramanian, E. Lopdrup, and S.J. Poon

OXYGEN ORDER, STOICHIOMETRY AND MAGNETIC BEHAVIOR OF YBa2(Cui_xFex)307+6 107

C.W. Kimball, J.L. Matykiewicz, John Giapintzakis, Hsun Lee, B.D. Dunlap, M. Slaski, F.Y. Fradin, C. Segre, and J.D. Jorgensen

IN-SITU PRODUCTION OF SUPERCONDUCTING YBa2Cu3O7_y THIN

FILMS BY HIGH PRESSURE REACTIVE EVAPORATION WITH RAPID THERMAL ANNEALING 113

D.K. Lathrop, S.E. Russek, and R.A. Buhrman

HIGH CRITICAL-CURRENT DENSITY Ba2YCu3O7 THIN FILMS PRODUCED BY COEVAPORATION OF Y, Cu, AND BaF2 119

P.M. Mankiewich, R.E. Howard, W.J. Skocpol, A.H. Dayem, A. Ourmazd, M.G. Young, and E. Good

RADIATION DAMAGE IN THIN FILMS OF HIGH Tc SUPERCONDUCTORS 127

G.J. Clark, F.K. Legoues, A.D. Marwick, R.B. Laibowitz, and R.H. Koch

PART IV: INVITED SESSION II

OPTICAL PROPERTIES OF DOPANT INDUCED STATES IN La2-xSrxCu04-6 COMPOUNDS 135

S. Etemad, D.E. Aspnes, P. Barboux, G.W. Hull, M.K. Kelly, J.M. Tarascon, R. Thompson, S.L. Herr, K. Kamaras, CD. Porter, and D.B. Tanner

THE n-p TRANSITION IN YBa2Cu3Og.5+x 141 G.M. Choi, H.L. Tuller, and*M.-J. Tsai

SINGLE-CRYSTAL STRUCTURAL STUDY OF La2CUQ,9 5Li0.054 147 J.M. Delgado, J.S. Speck, R.K. McMullan, G. Diaz de Delgado, and B.J. Wuensch

OBSERVATION OF HEXAGONALLY ORDERED FLUX QUANTA IN YBa2Cu307 153

P.L- Gammel, D.J. Bi shop, G.J. Dolan, J.R. Kwo, C.A. Murray, L.F. Schneemeyer, and J.V. Waszczak

PREPARATION OF HIGH Tc YBa2CU3O7_x POWDERS FROM NITRATE AND OXALATE PRECURSORS 159

M.H. Kayser, B. Borglum, G. Antony, S.G. Shyu, and R.C. Buchanan

HIGH~TC SUPERCONDUCTING OXIDE FILMS PRODUCED FROM SOLUTION PRECURSORS 165

Emanuel I. Cooper, Margaret A. Frisch, Edward A. Giess, Arunava Gupta, Brian W. Hussey,

Eugene J.M. 01Sullivan, Stanley I. Raider, and Gerald J. Scilla

PHASE EQUILIBRIA STUDIES NEAR THE SUPERCONDUCTING

YBa2CU3Ox COMPOSITION BY A SOLID-STATE IONIC TECHNIQUE 171 Byung Tae Ahn, Turgut M. Giir, Robert A, Huggins, Robert Beyers, and Edward M. Engler

X-RAY ABSORPTION STUDIES OF La2-xSrxCuO4 A^0 Y1_xPrxBa2Cu307_δ 177

E.E. Alp, G.K. Shenoy, L. Soderholm, G.L. Goodman, D.G. Hinks, B.W. Veal, P.A. Montano, and D.E. Ellis

ANISOTROPIC NORMAL STATE TRANSPORT PROPERTIES OF OXIDE

SUPERCONDUCTORS PREDICTED FROM LAPW BAND STRUCTURES 183 Philip B. Allen, Warren E. Pickett, and Henry Krakauer

PART V: INVITED SESSION III

DEVELOPMENTS OF TAPE AND WIRE FABRICATION PROCESSES FOR

HIGH TcBa2YCU3O7_y OXIDE SUPERCONDUCTORS 191 K. Togano, H. Kumakura, and H. Shimizu

THE DEPOSITION, FABRICATION AND CHARACTERISTICS OF HIGH CRITICAL TEMPERATURE DEVICES 197

G.W. Morris, M.G. Blamire, R.E. Somekh, E.J. Tomlinson, and J.E. Evetts

ALIGNED SINTERED COMPACTS OF RBa2Cu3O7_x (R=Dy, Er, Eu, Gd, Ho, Y) 203

R.H. Arendt, A.R. Gaddipati, M.F. Garbauskas, E.L. Hall, H.R. Hart, Jr., K.W. Lay, J.D. Livingston, F.E. Luborsky, and L.L. Schilling

DEFECT STRUCTURES IN YBa2Cu3O7_x PRODUCED BY ELECTRON IRRADIATION 209

M.A. Kirk, M.C. Baker, J.Z. Liu, D. J. Lam, and H.W. Weber

TRANSMISSION ELECTRON MICROSCOPE STUDIES ON MINOR PHASES AND IMPERFECTIONS IN YBa2Cu3Ox COMPOUNDS 215

Shozo Ikeda, Kazuhiro Kimura, Akiyuki Matsushita, Haruyoshi Aoki, Takeshi Hatano, Takehiko Matsumoto, and Keiichi Ogawa

FIELD DEPENDENCE OF MEISSNER EFFECT IN A SINGLE CRYSTAL OF YBa2CU3Ox IN THE ULTRA-LOW MAGNETIC FIELD REGIME 221

L. Krusin-Elbaum, A.P. Malozemoff, and Y. Yeshurun

FAR-INFRARED PROPERTIES OF ab PLANE ORIENTED YBa2Cu3O7_ 6 227

D.A. Bonn, A.H. O'Reilly, J.E. Greedan, C.V. Stager, T. Timusk, K- Kamaras, and D.B. Tanner

ON THE TWIN FORMATION IN ORTHORHOMBIC Y1Ba2CU3O7_y 233 D. Rios-Jara, C. Varea, A. Robledo, A. Huanosta, J.M. Dominguez, J. Omaha, T. Akachi, and R. Escudero

PART VI; PREPARATION OF BULK MATERIALS I

Ba2YCu306B9 POWDER PREPARATION BY SOL-GEL EMULSION TECHNIQUES 241

M.J. Cima, R- Chiu, and W.E. Rhine

SINTERING AND MICROSTRUCTURE - PROPERTY RELATIONS FOR YBa2Cu3Ox 245

R.K. Bordia, H.S. Horowitz, M.A. Subramanian, J.B. Michel, E.M. McCarron, III, C.C. Torardi, J.D. Bolt, U. Chowdhry, E. Lopdrup, and S.J. Poon

SYNTHESIS AND CHARACTERIZATION OF Ba2Cu3PrO7_x 249 J. Amador, C. Cascales, and I. Rasines

APPLICATION OF GEL TECHNOLOGY IN PREPARATION OF HIGH-TC PEROVSKITE SUPERCONDUCTORS 253

R.S. Liu, G.C. Lin, H.M. Sung, Y.C. Chen, and O.C.C. Lin

YBa2Cu3O7_6 SUPERCONDUCTORS PRODUCED BY HOT-PRESSING OF FREEZE-DRIED, CARBONATE- AND OXALATE-COPRECIPITATED POWDERS 257

C.T. Wang, L.S. Lin, J.H. Lin, J.Y. Su, S.J, Yang, and S.E. Hsu

THE FORMATION OF Y-Ba-Cu-0 PHASES DURING SOLID STATE REACTION 261

T.S- Chin, T.W. Huang, W.T. Lin, N.C. Wu, Y.H. Chou, T.C. Wu, P.T. Wu, and H.H. Yen

EFFECT OF THERMAL PROCESSING ON THE MICROSTRUCTURES AND SUPERCONDUCTING PROPERTIES OF YBa2Cu3Oy 265

K. Gotoh, H. Enomoto, K. Iida, Y. Takano, N. Mori, and H. Ozaki

PROCESSING-PROPERTY RELATIONS IN YBa2CU3O6+x SUPER- CONDUCTORS 269

A. Safari, J.B. Wachtman, Jr., V. Parkhe, R. Caracciolo, D. Jeter, A.S. Rao, H.G.K. Sundar, N. Jisrawi, and W.L. McLean

LASER INDUCED DEPOSITION OF YBa2Cu3O7_x THIN FILMS 273 H.S. Kwok, P. Mattocks, D.T. Shaw, L. Shi, X.W. Wang, S. Witanachchi, Q.Y. Ying, J.P. Zheng, and P. Bush

TOP SEEDED SOLUTION GROWTH OF LANTHANUM COPPER OXIDE 279 P.J, Picone, H.P. Jenssen, D.R, Gabbe, and H.L. Tuller

EFFECT OF OXYGEN ANNEALING ON LOW-RESISTIVITY CONTACTS FOR HIGH-TC SUPERCONDUCTORS 283

J.W. Ekin, A.J. Panson, and B.A. Blankenship

PART VII: FILMS, WIRES, ETC. I

HIGH Tc SUPERCONDUCTING FILMS FROM METALLO-ORGANIC PRECURSORS 289

W.W. Davison, S.G. Shyu, and R.C. Buchanan

FABRICATION AND SUPERCONDUCTING PROPERTIES OF HIGH Tc OXIDE WIRE 293

N. Sadakata, Y, Ikeno, M. Nakagawa, K. Gotoh, and O. Kohno

A METAL-ALLOY PROCESS FOR THE FORMATION OF OXIDE SUPERCONDUCTING FILMS: ADVANTAGES, PROBLEMS SUBSTRATE INTERACTIONS, BUFFER LAYERS 297

M. Gurvitch and A.T. Fiory

INTERFACE EFFECTS OF LASER ABLATED AND SPUTTERED HIGH Tc SUPERCONDUCTING THIN FILMS 303

B. Dam, T.S. Bailer, G.N.A. van Veen, H.A.M. van Hal, J.W.C. De Vries, and G.M. Stollman

SPIN-ON THIN FILMS OF YBa2CU3O7_y AND La2-xSrxCuO4-y FROM CITRATE-POLYMER PRECURSORS 307

Yet-Ming Chiang, Sharon L. Furcone, Jeri Ann S. Ikeda, and David A. Rudman

FABRICATION OF HIGH Tc SUPERCONDUCTING FILMS WITH DIFFUSION BARRIERS 311

C.L. Chien, Gang Xiao, M.Z. Cieplak, A. Bakhshai, A. Gavrin, F.H. Streitz, and J. Childress

FORMATION OF THIN FILM YBaCuO SUPERCONDUCTORS FROM Cu/BaO/Y2O3 LAYER STRUCTURES 315

Chin-An Chang, C.C. Tsuei, C.C Chi, M.R. Scheuermann, D.S. Yee, and J.P. Berosh

PREPARATION OF Y-Ba-Cu-0 SUPERCONDUCTING FILMS BY MODIFIED DC SPUTTERING PROCESS 319

R.J. Lin, Y.C. Chen, J.H. Kung, and P.T. Wu

PREPARATION OF THIN FILM YBa2CU3Og+x CERAMIC SUPER- CONDUCTORS BY THE SOL-GEL PROCESS 323

S. Kramer, K. Wu, and G. Kordas

FORMATION AND PROCESSING OF HIGH Tc SUPERCONDUCTOR FILMS WITH PULSED EXCIMER LASER 327

Tomoji Kawai, Masaki Kanai, and Maki Kawai

PROPERTIES OF Y-Ba-Cu-0 FILM FORMED BY THE SPRAY PYROLYSIS METHOD 331

Maki Kawai, Tomoj i Kawai, Hiromi Masuhira, and Makoto Takahasi

THIN FILMS OF Y-Ba-Cu-0 BY RF SPUTTERING 335 Paul H. Ballentine, A.M. Kadin, J. Ar