78 research outputs found
Pressure effects on the structural and superconducting transitions in LaâCoâSnââ
La3Co4Sn13 is a superconducting material with transition temperature at Tc = 2.70 K, which
presents a superlattice structural transition at T
â â 150 K, a common feature for this class of
compounds. However, for this material, it is not clear that at T
â
the lattice distortions arise from
a charge density wave (CDW) or from a distinct microscopic origin. Interestingly, it has been
suggested in isostructural non-magnetic intermetallic compounds that T
â
can be suppressed to zero
temperature, by combining chemical and external pressure, and a quantum critical point is argued
to be observed near these critical doping/pressure. Our study shows that application of pressure
on single-crystalline La3Co4Sn13 enhances Tc and decreases T
â
. We observe thermal hysteresis
loops for cooling/heating cycles around T
â
for P & 0.6 GPa, in electrical resistivity measurements,
which are not seen in x-ray diffraction data. The hysteresis in electrical measurements may be due
to the pinning of the CDW phase to impurities/defects, while the superlattice structural transition
maintains its ambient pressure second-order transition nature under pressure. From our experiments
we estimate that T
â
vanishes at around 5.5 GPa, though no quantum critical behavior is observed
up to 2.53 GPa
Is there a therapeutic window for pentoxifylline after the onset of acute pancreatitis?
Ultrastructural study of morphological changes in Schistosoma mansoni after in vitro exposure to the monoterpene rotundifolone
O conhecimento dos estudantes da faculdade de medicina de MarĂlia (Famema) sobre responsabilidade profissional e segredo mĂ©dico
Measurement of Elastic Modulus and Vickers Hardness of Surround Bone Implant Using Dynamic Microindentation - Parameters Definition
Probiotic lactobacilli inhibit early stages of Candida albicans biofilm development by reducing their growth, cell adhesion, and filamentation
We evaluated the inhibitory effects of the probiotic Lactobacillus species on different phases of Candida albicans biofilm development. Quantification of biofilm growth and ultrastructural analyses were performed on C. albicans biofilms treated with Lactobacillus rhamnosus, Lactobacillus casei, and Lactobacillus acidophilus planktonic cell suspensions as well as their supernatants. Planktonic lactobacilli induced a significant reduction (p\ua0\ua00.05), but significantly reduced the early stages of Candida biofilm formation (p\ua
Functional antagonism between nitrogen-fixing leguminous trees and calcicole-drought-tolerant trees in the Cerrado
Parasitological characteristics of Schistosoma mansoni infection in swiss mice with underlying malnutrition
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