Related Experiment Video
Updated: Aug 7, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Spin-flop and spin-Peierls transition in doped CuGeO3
1Physics Department, Science Faculty, Bozok University, 66500 Yozgat, Turkey. orhanyalcin@gmail.com
Abstract:
Ni++ ions doped inorganic CuGeO3 sample has been studied by using electron spin resonance (ESR) technique in the temperature range of 3-300 K. The ESR spectrum of Cu++ ion has been observed to be strongly temperature dependent for inorganic spin-Peierls (SP) Cu0.96Ni0.04GeO3 samples. The ESR line width and ESR amplitude exponentially vanishes below a critical temperature, Tsp=14 K. The one-dimensional (1D) antiferromagnetic (AF) spin chain formed of Cu++ is broken by Ni++ (spin-1) ion, giving uncoupled spins at the end of the chains that give extra contribution to the spectra at lower temperature and stabilizes a Néel state. The g-factor is much smaller than the expected value for isolated Cu++ and Ni++ ions and is much more anisotropic than for undoped samples [O. Yalçin, B. Aktaş, J. Magn. Magn. Mater. 258/259 (2003) 137 (reference therein)]. It is shown that the ground state of dimerized spins is singlet. The spin-flop (SF) phenomenon is obtained from AF state mixed condition and then ferromagnetic (FM) state. The spin-flop field slightly increases when increasing temperature in the temperature range 100-300 K. The SF transition is showed almost AF order for Cu0.96Ni0.04GeO3.
More Related Videos
06:53Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Related Concept Videos
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Spin–Spin Coupling: One-Bond Coupling
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement