Determination of anisotropic He2 up to 46 T in (BaO.55K0.45)Fe2As2 single crystals

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review B Rapid Communications

OSTI ID:960580

Altarawneh, M M ^[1]; Collar, K N ^[1]; Mielke, C H ^[1]; Ni, N ^[2]; Bud'ko, S ^[3]; Canfield, P ^[2]

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1. Los Alamos National Laboratory
2. IOWA STATE UNIV
3. IOWA STATE UNIV.

The magnetoresistance and the radio frequency penetration depth was measured in the superconductor (Ba{sub 0.55}K{sub 0.45})Fe{sub 2}As{sub 2} under pulsed arid static magnetic fields extending to 46 tesla and down to 20 K. Using these data we are able to infer a H{sub c2}(T), H - T phase diagram, for applied fields parallel and perpendicular to the crystallographic c-axis. The upper critical field anisotropy is moderate, {approx} 3.5 close to T{sub c} , and decreases with the decrease of temperature, reaching {approx} 1.5 at T {approx} 20K. These data and analysis indicate that (i) (Ba{sub 0.55}K{sub 0.45})Fe{sub 2}As{sub 2} is well described by Ginzburg-Landau theory and at 20 K is very close to a dimensional crossover and (ii) H{sub c2}(T = 0) for this compound may easily approach fields of 75 tesla.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 960580
• Report Number(s): LA-UR-08-05344; LA-UR-08-5344; PRBOFW; TRN: US1002076
• Journal Information: Physical Review B Rapid Communications, Journal Name: Physical Review B Rapid Communications; ISSN 1089-4896
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANISOTROPY
CRITICAL FIELD
DATA
GINZBURG-LANDAU THEORY
MAGNETIC FIELDS
MAGNETORESISTANCE
MONOCRYSTALS
PENETRATION DEPTH
PHASE DIAGRAMS
SUPERCONDUCTORS