Evidence of unusual hybridization: Electrical resistivity and specific heat of Y{sub 1{minus}{ital x}}Tb{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7} single crystals

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.71· OSTI ID:76411

Cao, G; McCall, S; Freibert, F; Shepard, M; Henning, P; Crow, J E ^[1]; Andraka, B ^[2]

---

1. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005 (United States)
2. Department of Physics, University of Florida, Gainesville, Florida 32611 (United States)

The electrical resistivity {rho}({ital T},{ital x}) (4{le}{ital T}{le}300 K) and specific heat {ital C}({ital T},{ital x}) (0.3{le}{ital T}{le}15 K) have been measured on single crystals of Y{sub 1{minus}{ital x}}Tb{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7}. $T sub c--- is 91 K and irrespective of Tb doping. However, the {ital T}-linear slope of {rho}({ital T},{ital x}) for {ital T}{gt}{ital T}{sub {ital c}} increases rapidly with increasing {ital x}, and a fit of {rho}({ital T},{ital x}) to {ital A}+{ital BT} indicates that the Tb doping primarily alters the slope and much more weakly impacts on the {ital T}{r_arrow}0 intercept. The results of the low-temperature {ital C}({ital T},{ital x}), on the other hand, show an anomalously enhanced electron contribution to {ital C}({ital T}), {gamma}. The enhancement of {gamma}, along with a large temperature-independent magnetic susceptibility {chi}{sub 0} reported earlier, strongly suggests the appearance of strong {ital f} conduction-electron hybridization. It becomes apparent that the Tb-doped system possesses properties that largely deviate from the well-known behavior of the other high-{ital T}{sub {ital c}} and doped high-{ital T}{sub {ital c}} systems, thus standing out as being anomalous.

• OSTI ID: 76411
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
HYBRIDIZATION
MONOCRYSTALS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TERBIUM OXIDES
YTTRIUM OXIDES