scholarly journals Mixed-valence-driven heavy-fermion behavior and superconductivity in KNi2Se2

2012 ◽  
Vol 86 (5) ◽  
Author(s):  
James R. Neilson ◽  
Anna Llobet ◽  
Andreas V. Stier ◽  
Liang Wu ◽  
Jiajia Wen ◽  
...  
Keyword(s):  
Heavy Fermion ◽  
Mixed Valence ◽  
Heavy Fermion Behavior

Systematics of mixed valence and heavy fermion behaviors in YbCu5 and related systems

2000 ◽  
Vol 281-282 ◽  
pp. 141-143 ◽  
Author(s):  
Kazuyoshi Yoshimura ◽  
Naohito Tsujii ◽  
Kouichi Sorada ◽  
Takashi Kawabata ◽  
Hiroyuki Mitamura ◽  
...  
Keyword(s):  
Heavy Fermion ◽  
Mixed Valence

Coexistence of magnetic order and heavy fermion behavior in Ce7X3

1992 ◽  
Vol 108 (1-3) ◽  
pp. 183-184 ◽  
Author(s):  
J.G. Sereni ◽  
O. Trovarelli ◽  
G. Schmerber ◽  
J.P. Kappler
Keyword(s):  
Heavy Fermion ◽  
Magnetic Order ◽  
Heavy Fermion Behavior

CRYSTALLINE STRUCTURE AND PHYSICAL PROPERTIES OF UCo2Al3

2004 ◽  
Vol 18 (30) ◽  
pp. 3905-3914
Author(s):  
E. VERDÍN ◽  
R. ESCUDERO
Keyword(s):  
Intermetallic Compound ◽  
Physical Properties ◽  
Single Crystal ◽  
Intermetallic Compounds ◽  
Heavy Fermion ◽  
Ferromagnetic Transition ◽  
Crystallographic Characteristics ◽  
Heavy Fermion Behavior ◽  
Small Single Crystal ◽  
Weak Ferromagnetic

Some intermetallic compounds which contain uranium or cerium present heavy fermion characteristics. Take, for example, in the UM 2 Al 3 ( M = Pd , Ni ) family, superconductivity and magnetism coexist and present heavy fermion behavior. This work presents the crystallographic characteristics and physical properties of a new compound of this family; the intermetallic compound UCo 2 Al 3. Our initial crystallographic studies performed in a small single crystal show that the structure is hexagonal and similar to the UNi 2 Al 3 and UPd 2 Al 3 parent compounds. The space group is P6/mmm with a=5.125 Å and c=4.167 Å crystalline parameters. Measurements of resistivity and magnetization performed on the single crystal reveal that the compound is not superconducting when measured at about 1.8 K. The compound is highly anisotropic and features related to Kondo-like behavior are observed. A weak ferromagnetic transition is observed at a temperature of about 20 K.

THEORETICAL APPROACH USING EXTENDED HUCKEL TIGHT-BINDING METHOD OF THE ELECTRONIC STRUCTURE OF CeOs4Sb12 FILLED SKUTTERUDITE

2006 ◽  
Vol 20 (08) ◽  
pp. 1005-1014
Author(s):  
DONALD H. GALVAN ◽  
J. C. SAMANIEGO
Keyword(s):  
Heavy Fermion ◽  
Energy Gap ◽  
Population Analysis ◽  
Tight Binding ◽  
Energy Bands ◽  
Mulliken Population ◽  
Semiconductor Behavior ◽  
Tight Binding Method ◽  
Strong Hybridization ◽  
Heavy Fermion Behavior

Based on band structure, total and projected density of states and Mulliken Population Analysis, the electronic properties of CeOs 4 Sb 12 were investigated. The calculated energy bands depict a semiconductor behavior with an energy gap (direct gap at H ) of the order of 0.45 eV. On the other hand, a strong hybridization occurs between Ce f-orbitals with Os d-, p-, and Sb p-orbitals, which convince us to believe that this hybridization, added to the existence of a mini gap, are responsible for the heavy Fermion behavior, as well as the possibility to consider it a candidate for thermoelectric applications.

Depression of superconductivity, heavy fermion behavior and valence fluctuations in Y1−xPrxBa2Cu3O7

1989 ◽  
Vol 69 (4) ◽  
pp. 379-384 ◽  
Author(s):  
Chan-Soo Jee ◽  
A. Kebede ◽  
D. Nichols ◽  
J.E. Crow ◽  
T. Mihalisin ◽  
...  
Keyword(s):  
Heavy Fermion ◽  
Valence Fluctuations ◽  
Heavy Fermion Behavior
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