Low-temperature properties of pseudoternary R(Rh/sub 1-x/Ir/sub x/)/sub 4/B/sub 4/ (R=Ho and Dy) systems

Journal Article · Thu Dec 31 23:00:00 EST 1987 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00683252· OSTI ID:6865976

Yang, K N; Lambert, S E; Maple, M B; Ku, H C

Pseudoternary Ho(Rh/sub 1-x/Ir/sub x/)/sub 4/B/sub 4/ and Dy(Rh/sub 1-x/Ir/sub x/)/sub 4/B/sub 4/ systems were investigated with respect to the interplay between superconductivity (SC) and long-range magnetic ordering by means of specific heat (C) and upper critical magnetic field (H/sub c2/) measurements. For Ho(Rh/sub 1-x/Ir/sub x/)/sub 4/B/sub 4/ with x less than or equal to 0.2 and Dy(Rh/sub 1-x/Ir/sub x/)/sub 4/B/sub 4/ with x less than or equal to 0.15, ferromagnetic (FM) ordering , reminiscent of spin-1/2 mean-field theory, was observed. In particular, FM ordering in Ho(Rh/sub 1-x/Ir/sub x/)/sub 4/B/sub 4/ with 0.07 less than or equal to x less than or equal to 0.2 was found to destroy SC at a second critical temperature T/sub c2/ below the superconducting transition temperature T/sub c/, and was accompanied by a spike-shaped feature in C at T/sub c2/. Coexistence of antiferromagnetic (AFM) ordering with SC was observed in both systems for 0.2 less than or equal to x less than or equal to 0.7. The compounds with x less than or equal to 0.5 exhibited Neel temperatures T/sub N/ that were smaller than T/sub c/ and enhanced values of H/sub c2/ below T/sub N/. The T/sub c/ and T/sub N/ undergo an abrupt decrease and increase, respectively, near x approx. 0.5, and then cross at x approx. 0.6, above which T/sub N/ > T/sub c/. For Ho(Rh/sub 1-x/Ir/sub x/)/sub 4/B/sub 4/ with 0.275 less than or equal to x less than or equal to 0.4, two different AFM transitions were detected in a double-peak feature in C.

• Research Organization: Univ. of California at San Diego, La Jolla (USA)
• OSTI ID: 6865976
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 70:1-2; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ANTIFERROMAGNETISM
BORIDES
BORON COMPOUNDS
CRITICAL FIELD
DIAGRAMS
DYSPROSIUM BORIDES
DYSPROSIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC SPECIFIC HEAT
FERROMAGNETISM
HOLMIUM BORIDES
HOLMIUM COMPOUNDS
IRIDIUM BORIDES
MAGNETIC FIELDS
MAGNETISM
MEAN-FIELD THEORY
ORDER PARAMETERS
ORDER-DISORDER TRANSFORMATIONS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
RHODIUM BORIDES
RHODIUM COMPOUNDS
SPECIFIC HEAT
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE