• Keine Ergebnisse gefunden

Theoretical Investigation of the EPR g-factors for Yb

N/A
N/A
Info
Herunterladen
Protected

Academic year: 2022

Aktie "Theoretical Investigation of the EPR g-factors for Yb"

Copied!
1
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Jetzt herunterladen ( 1 Seite )

Volltext

(1)

Theoretical Investigation of the EPR g-factors for Yb

3+

in YBa

2

Cu

3

O

7-δ

Hui-Ning Donga,b, Shao-Yi Wub,c, and Xiao-Bing Luoa

aInstitute of Applied Physics and College of Electronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China

bInternational Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, P. R. China

cDepartment of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

Reprint requests to Dr. H.-N. D.; E-mail:donghn@cqupt.edu.cn Z. Naturforsch. 59a, 346 – 348 (2004); received March 29, 2004

The EPR g factors g, g⊥for Yb3+in YBa2Cu3O7−δare studied with perturbation formulas based on the cluster approach of the spin-Hamiltonian parameters for a 4f13 ion in tetragonal symmetry.

In these formulas, the contributions to the EPR parameters of the covalency effects, the admixture between the J=7/2 and J=5/2 states and the second-order perturbation terms are all included.

The used crystal-field parameters are calculated with the superposition model and the local structural data of Yb3+in YBa2Cu3O7−δ. The resulting EPR g factors for Yb3+ions in the superconductor YBa2Cu3O7−δagree reasonably with the experimental values. The results are discussed.

Key words: Electron Paramagnetic Resonance; High-Tc Superconductor; Yb3+; YBa2Cu3O7−δ.

Referenzen

Jetzt herunterladen ( PDF - 1 Seite - 9.22 KB )

ÄHNLICHE DOKUMENTE

Department of Physics and Astronomy University of Heidelberg

As the same sensors will be used in the inner and outer detector layers, the exprint should also have a similar width as the inner detector layer exprints.. Due to the fact that

Department of Physics and Astronomy University of Heidelberg

All local static displacements found in layer 3 were smaller than 2 µm, as large as or smaller than the average amplitudes of flow induced vibrations in the module.. Thus the

Investigations of the EPR g Factors for Er in CaMoO

From Table 1 one can find that the calculated g fac- tors for Er 3+ in CaMoO 4 based on the perturbation for- mulas of the g factors for 4f 11 ions in tetragonal sym-.. metry agree

Theoretical Investigation of the EPR g-factors for Yb

On the other hand, electron paramagnetic resonance (EPR) studies of rare- earth (Re 3+ ) ions in high-Tc oxide superconductors have attracted much interest because they can pro-

Center Found from EPR Measurements in CaF

c Institute of Solid State Physics, Sichuan Normal University, Chengdu 610066, China. d Department of Applied Physics, University of Electronic Science and Technology of China,

Studies of the EPR g Factors and Hyperfine Structure Constants for Yb

It is found intrinsic parameters ¯ A(R 0 ) that the superposition model with the same R 0 for Yb 3 + in various zircon-type compounds obtained by considering local lattice relax-

Theoretical Investigations of the EPR g Factors for Er

a Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054,

Theoretical Investigations of the EPR g Factors for Er

Since Er 3+ ion has an effective spin S = 1 / 2, a large g value (g 2) and a long spin-lattice relaxation time com- pared with other rare earth ions having a non-zero or-