Magnetism, structure and superconductivity in CaFe2As2

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review Letters

OSTI ID:960900

Park, Tuson O ^[1]; Lee, Han ^[1]; Ronning, Filip ^[1]; Bauer, Eric D ^[1]; Thompson, Joe D ^[1]

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1. Los Alamos National Laboratory

Tbe spin-density-wave (SDW) anti ferromagnet CaFe{sub 2}As{sub 2} becomes superconducting under pressure. By measuring electrical resistivity and magnetic susceptibility under pressure, we show that bulk superconductivity is present in a narrow pressure range where a collapsed tetrgaonal structure is favored. At higher pressures, a new low-temperature structure appears, with the boundary between this new structure and the collapsed tetragonal structure strongly dependent on pressure history. Magnetic fluctuations in the collapsed phase appear to be important for superconductivity.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 960900
• Report Number(s): LA-UR-08-06424; LA-UR-08-6424; PRLTAO; TRN: US1002662
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
ARSENIC COMPOUNDS
CALCIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
FLUCTUATIONS
IRON COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MAGNETISM
PRESSURE RANGE
SPIN WAVES
SUPERCONDUCTIVITY
TEMPERATURE RANGE 0065-0273 K