Anisotropy of the upper critical field near Tc and the properties of URu sub 2 Si sub 2 and UBe sub 13 in the normal state

Journal Article · Sat Nov 30 23:00:00 EST 1991 · Journal of Low Temperature Physics; (United States)

DOI:https://doi.org/10.1007/BF00682192· OSTI ID:5166187

Aliev, F G; Kovachik, V; Moshchalkov, V V; Pryadun, V V ^[1]; Alekseevskii, N E; Mitin, A V ^[2]; Agrait, N; Vieira, S; Villar, R ^[3]

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1. Moscow State Univ. (USSR)
2. Inst. for Physical Problems, Moscow (USSR)
3. Univ. Autonoma de Madrid (Spain)

Simultaneous measurements of the electrical resistivity {rho}, Seebeck coefficient S, and thermal conductivity k of URu{sub 2}Si{sub 2} and UBe{sub 13} are carried out. For URu{sub 2}Si{sub 2} a strong anomaly in the k(T) dependence near the temperature of the antiferromagnetic transition was observed. The thermal conductivity of UBe{sub 13} exhibits only a small (about 30%) change of the derivative dk/dT near 8-9 K, which may be related to an increase of the characteristic length of antiferromagnetic correlations below this temperature. Studying STM spectra in the normal and magnetic phase of a URu{sub 2}Si{sub 2} single crystal, it was observed that the magnetic gap, partially opened at the Fermi surface below the Neel temperature, T{sub N} = 17.5 K, is strongly anisotropic: gapped states mainly correspond to the tetragonal ab-plane. Anisotropy of the upper critical field near {Tc} (H < 4kOe), studied for URu{sub 2}Si{sub 2} and UBe{sub 13} single crystals, was found to be in a good correspondence with the character of the antiferromagnetic transition.

• OSTI ID: 5166187
• Journal Information: Journal of Low Temperature Physics; (United States), Journal Name: Journal of Low Temperature Physics; (United States) Vol. 85:5-6; ISSN 0022-2291; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ANISOTROPY
BERYLLIUM ALLOYS
CRITICAL FIELD
ELECTRICAL PROPERTIES
MAGNETIC FIELDS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RUTHENIUM ALLOYS
SILICON ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
URANIUM ALLOYS