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U. Welp

United States Department of Energy

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Synthetic Metals | 1995

New ET-based organic superconductors with the organometallic anion Cu(CF3)4-

Urs Geiser; John A. Schlueter; K. Douglas Carlson; Jack M. Williams; H. Hau Wang; Wai Kwong Kwok; U. Welp; John A. Fendrich; James D. Dudek; Crystal A. Achenbach; Adam S. Komosa; Patricia M. Keane; Dieter Naumann; Thomas Roy; J. E. Schirber; W. R. Bayless; J. Ren; M.-H. Whangbo

Abstract Electrocrystallization of bis(ethylenedithio)tetrathiafulvalene (ET) with (PNP)Cu(CF 3 ) 4 in 1,1,2-trichloroethane (TCE) results in two new superconductors, κ L -(ET) 2 Cu(CF 3 ) 4 ·(TCE), 1 , with T c = 4.0 K, and κ H -(ET) 2 Cu(CF 3 ) 4 ·(TCE) x , 2 , with T c = 9.2 K. 1 forms well-developed plate-like crystals whose structure was determined by X-ray crystallography. Its band electronic structure is reported. The κ H -phase forms long, thin needle bundles.

Physical Review B | 1990

a-b anisotropy of the normal-state resistivity of untwinned YBa2Cu3O7- delta.

U. Welp; S. Fleshler; W. K. Kwok; J. W. Downey; Y. Fang; G. W. Crabtree; J. Z. Liu

Physical Review B | 1992

Flux pinning in YBa2Cu3O7- delta single crystals: Neutron irradiation and annealing.

Vlcek Bm; M. C. Frischherz; S. Fleshler; U. Welp; J. Z. Liu; J. W. Downey; K.G. Vandervoort; G. W. Crabtree; M. A. Kirk; J. Giapintzakis; J. W. Farmer

Microscopy Microanalysis Microstructures | 1994

Near-field magneto-optical microscope

Vitalii K. Vlasko-Vlasov; U. Welp; George W. and Crabtree

Physical Review B | 1993

Effect of gold impurities on the superconducting fluctuations and the upper critical field ofYBa2Cu3O7−δsingle crystals

U. Welp; S. Fleshler; W. K. Kwok; J. W. Downey; G. W. Crabtree; H. Claus; A. Erb; Müller-Vogt G

Physical Review B | 2002

Vortex-lattice melting in untwinnedYBa2Cu3O7−δforH⊥c

A. Schilling; U. Welp; W. K. Kwok; George W. Crabtree

Physical Review B | 1995

Order of the fundamental vortex transformation in YBa2Cu3O7- delta.

D. E. Farrell; W. K. Kwok; U. Welp; John Anton Fendrich; G. W. Crabtree

Physical Review B | 2015

Anisotropic superconductors in tilted magnetic fields

V. K. Vlasko-Vlasov; Andreas Glatz; A. E. Koshelev; U. Welp; W. K. Kwok

Physical Review B | 2002

Vortex-lattice melting in untwinned YBa2Cu3O7-Φ for H⊥c

A. Schilling; U. Welp; W. K. Kwok; George W. Crabtree

Archive | 1998

Magneto-Optical Observation of Flux Patterns Due to Microscopic Holes in YBa_2Cu_3O_7-d Thin Films (This work was supported by the U.S. Department of Energy, BES-Materials Science under contract #W-31-109-ENG-38 (TBP,UW,GWC,VVV))

Ted B. Peterson; U. Welp; George W. Crabtree; V. K. Vlasko-Vlasov; V. I. Nikitenko; Richard Hammond

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