The afterglow of phosphorescent compounds can be distinguished from background fluorescence and scattered light by a time-resolved observation, which is a beneficial property for bioimaging. Phosphorescence emission accompanies spin-forbidden transitions from an excited singlet state through an excited triplet state to a ground singlet state. Since these intersystem crossings are facilitated us...

We report a study of the low-temperature high-pressure phase diagram of the intermetallic compound PrCu2, by means of molecular-field calculations and Cu nuclear-quadrupole-resonance (NQR) measurements under pressure. The pressure-induced magnetically-ordered phase can be accounted for by considering the influence of the crystal electric field on the 4f electron orbitals of the Pr ions and by i...

Nuclear magnetism in n-doped semiconductors with positive hyperfine constant is revisited. Two kinds of nuclear magnetic ordering can be induced by resident electrons a deeply cooled spin system. At temperature below critical value, randomly oriented polarons similar to that predicted I. Merkulov [I. Merkulov, Physics the Solid State 40, 930 (1998)] should emerge. These are and within each pola...

The present utility of nuclear magnetic resonance (NMR) spectroscopy in chemical analysis and magnetic resonance imaging (MRI) in the clinical environment has made this technology commonplace in the chemical industry, clinical medicine, and academic research. The attributes of nuclear magnetism that make the technique especially powerful in biology are discussed. This paper reviews the uses of ...

Spin noise spectroscopy is an optical technique which can probe spin resonances non-perturbatively. First applied to atomic vapours, it revealed detailed information about nuclear magnetism and the hyperfine interaction. In solids, this approach has been limited to carriers in semiconductor heterostructures. Here we show that atomic-like spin fluctuations of Mn ions diluted in CdTe (bulk and qu...

In magnetism, of which molecular magnetism is a part, the term frustration is used rather sloppily. Sometimes one gains the impression that if the reason for some phenomenon is not quite clear then it is attributed to frustration. In this paper a discussion of the effects of frustration that are relevant for the field of molecular magnetism is presented. As will become clear later these effects...

We show that applying magnetic fields up to 30 T has a dramatic effect on the ultrafast spin dynamics in ferrimagnetic GdFeCo. Upon increasing the field beyond a critical value, the dynamics induced by a femtosecond laser excitation strongly increases in amplitude and slows down significantly. Such a change in spin response is explained by different dynamics of the Gd and FeCo magnetic sublatti...

B. A. Assaf,1 F. Katmis,2,3 P. Wei,2 Cui-Zu Chang,2 B. Satpati,4 J. S. Moodera,2,3 and D. Heiman1 1Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA 2Francis Bitter Magnet Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 3Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 4Saha Institute...

The magnetic structure of antiferromagnetic $\alpha$-Mn has been unclarified for almost 70 years since its magnetism was discovered. We measured the zero-field nuclear resonance spectra to obtain further insight into below $T_{\text{N}} = 95$ K. site II split two sites with five subpeaks owing quadrupole interaction, and this shows that ordered moments at are slightly tilted from $[001]$ direct...

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