Superconducting transition and phase diagram of single crystal MgB{sub 2}.

Journal Article · Wed Jan 01 00:00:00 EST 2003 · Phys. Rev. B

DOI:https://doi.org/10.1103/PhysRevB.67.012505· OSTI ID:961066

Welp, U; Rydh, A; Karapetrov, G; Kwok, W K; Crabtree, G W; Marcenat, Ch; Paulius, L; Klein, T; Marcus, J; Kim, K H. P.; Jung, C U; Lee, H -S; Kang, B; Lee, S -I; CEA, Grenoble; CNRS,

The superconducting phase diagram of MgB{sub 2} was determined from magnetization, magneto-transport and the first single-crystal specific heat measurements. A zero-temperature in-plane coherence length of 8 nm is determined. The superconducting anisotropy {gamma} increases from a value around 2 near T{sub c} to above 4.5 at 22 K. For H {parallel} c a pronounced peak effect in the critical current occurs at the upper critical field. Evidence for a surface superconducting state is presented for H {parallel} c, which might account for the wide spread in reported values of {gamma}.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF); FOR
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 961066
• Report Number(s): ANL/MSD/JA-44321; TRN: US1003247
• Journal Information: Phys. Rev. B, Vol. 67, Issue Jan. 1, 2003; ISSN 1098-0121
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
COHERENCE LENGTH
CRITICAL CURRENT
CRITICAL FIELD
MAGNESIUM BORIDES
MAGNETIZATION
MONOCRYSTALS
PHASE DIAGRAMS
SPECIFIC HEAT
SUPERCONDUCTIVITY
SURFACES
TRANSITION TEMPERATURE