Published December 17, 2012 | Version v1
Journal article Metadata-only

Gap-like feature in the normal state of X(Fe1−x Cox)2As2, X = Ba, Sr and Fe1+yTe revealed by Point Contact Spectroscopy

Creators

  • 1. Department of Physics and the Frederick Seitz Material Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
  • 2. Cavendish Laboratory, J J Thomson Ave, University of Cambridge (United Kingdom)
  • 3. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York, 11973 (United States)
  • 4. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011 (United States)

Description

Point contact spectroscopy reveals a gap-like feature above the magnetic and structural transition temperatures for underdoped Ba(Fe1−xCox)2As2, SrFe2As2 and Fe1+yTe. The conductance spectrum starts showing an enhancement at temperatures as high as 177 K for BaFe2As2 (TN ∼ 132 K) and 250 K for SrFe2As2 (TN ∼ 192 K). Possible origins for this enhancement are discussed in light of recent experimental claims of nematicity in these materials. We construct a modified phase diagram for Co-doped Ba122 showing a gap-like feature existing above TN and TS for the underdoped regime.

Availability note (English)

Available from http://dx.doi.org/10.1088/1742-6596/400/2/022001

Additional details

Identifiers

DOI
10.1088/1742-6596/400/2/022001;

Publishing Information

Journal Title
Journal of Physics. Conference Series (Online)
Journal Volume
400
Journal Issue
2
Journal Page Range
[6 p.]
ISSN
1742-6596

Conference

Title
26. international conference on low temperature physics
Acronym
LT26
Dates
10-17 Aug 2011
Place
Beijing (China)

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
44039939
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Conference
Descriptors DEI
BARIUM COMPOUNDS; COBALT COMPOUNDS; CUPRATES; DOPED MATERIALS; ELECTRIC CONTACTS; HIGH-TC SUPERCONDUCTORS; IRON ARSENIDES; IRON TELLURIDES; NEEL TEMPERATURE; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; SPECTROSCOPY; STRONTIUM COMPOUNDS; TEMPERATURE DEPENDENCE
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ARSENIC COMPOUNDS; ARSENIDES; CHALCOGENIDES; COPPER COMPOUNDS; DIAGRAMS; ELECTRICAL EQUIPMENT; EQUIPMENT; INFORMATION; IRON COMPOUNDS; MATERIALS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PNICTIDES; SUPERCONDUCTORS; TELLURIDES; TELLURIUM COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION TEMPERATURE; TYPE-II SUPERCONDUCTORS