71 research outputs found
Experimental observation of quantum entanglement in low dimensional spin systems
We report macroscopic magnetic measurements carried out in order to detect
and characterize field-induced quantum entanglement in low dimensional spin
systems. We analyze the pyroborate MgMnB_2O_5 and the and the warwickite
MgTiOBO_3, systems with spin 5/2 and 1/2 respectively. By using the magnetic
susceptibility as an entanglement witness we are able to quantify entanglement
as a function of temperature and magnetic field. In addition, we experimentally
distinguish for the first time a random singlet phase from a Griffiths phase.
This analysis opens the possibility of a more detailed characterization of low
dimensional materials
Structure and Biosynthesis of Amychelin, an Unusual Mixed-Ligand Siderophore from Amycolatopsis sp. AA4
The crystal structure of a blatterite mineral, Mg1.33 Mn1.44 Fe0.05 Sb0.17 O2 BO3, a combined single crystal X-ray and HREM study
Structural investigations of new calcium - rare earth (R) oxyborates with the composition Ca4RO(BO3)3
Molecular and crystal structure of Sp-thymidin-3'-yl 4-thiothymidin-5'-yl methylphosphonate.
The molecular structure of one diastereomer of the dinucleoside methylphosphonate Tp(Me)sT (1) has been determined by X-ray diffraction methods. The crystal asymmetric unit contains one molecule of 1 and one methanol in an orthorhombic unit cell of dimensions a = 13.241(4), b = 13.844(3), c = 14.944(7) A, space group P2(1)2(1)2(1). Both pyrimidine bases in 1 are oriented anti relative to the 2'-deoxyribose rings, and the sugar conformations are 2E and 2(3)T in the 4-thiothymidine and thymidine moieties, respectively. The deoxyribose-phosphonate backbone has an extended conformation with the bases completely unstacked and almost parallel. The absolute configuration at the phosphorus center in 1 is Sp
Synthesis, Characterization, and Structural Determination of the Bimetallic Alkoxide ErAl 3
- …