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T Radu

Publications and source records attributed to T Radu.

5 recordsLinked to original sources
PubMed2005

Bose-Einstein condensation of magnons in Cs2CuCl4.

We report on results of specific heat measurements on single crystals of the frustrated quasi-2D spin-1/2 antiferromagnet Cs2CuCl4 (T(N)=0.595 K) in external magnetic fields B<12 T and for temperatures T>30 mK. Decreasing B from high fields leads to the closure of the field-induced gap in the magnon spectrum at a critical field Bc approximately = 8.51 T and a magnetic phase transition is clearly seen below Bc. In the vicinity of Bc, the phase transition boundary is well described by the power law Tc(B) proportional, variant (Bc-B)(1/phi), with the measured critical exponent phi approximately =1.5. These findings are interpreted as a Bose-Einstein condensation of magnons.

Journal Article↗
PubMed2005

Field-induced suppression of the heavy-fermion state in YbRh2Si2.

We report dc-magnetization measurements on YbRh2Si2 at temperatures down to 0.04 K, magnetic fields B< or =11.5 T, and under hydrostatic pressure P< or =1.3 GPa. At ambient pressure a kink at B* =9.9 T indicates a new type of field-induced transition from an itinerant to a localized 4f state. This transition is different from the metamagnetic transition observed in other heavy-fermion compounds, as here ferromagnetic rather than antiferromagnetic correlations dominate below B*. Hydrostatic pressure experiments reveal a clear correspondence of B* to the characteristic spin fluctuation temperature determined from specific heat.

Journal Article↗
PubMedDate not supplied

[Diagnostic value of blood fibrinogen in leptospirosis].

A study was carried out on the value of the presumptive diagnosis of fibrinogenemia in the uncharacteristic forms of leptospirosis, during the first eight days of the disease, in 42 cases, as compared to that of erythrocyte sedimentation rate. The results of fibrinogenemia determinations were more suggestive of the diagnosis at the beginning of the disease.

Fibrinogen↗
PubMedDate not supplied

[Therapeutic considerations on severe leptospirosis].

The present paper reports on the results obtained by intravenous administration of furosemide which shortened the period of oliguria in the course of acute renal insufficiency in leptospirosis. The criteria of administration of heparin for preventing the intravascular disseminated coagulation syndrome in leptospirosis are discussed.

Acute Kidney Injury↗