Ion pairs and spontaneous break of symmetry in the valence-fluctuating compound YbB12
Physical Review B - Condensed Matter and Materials Physics Volume 68 Issue 1
Page 014425-1-014425-7
published_at 2003-07-24
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| File | |
| Title ( eng ) |
Ion pairs and spontaneous break of symmetry in the valence-fluctuating compound YbB12
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| Creator |
Altshuler Tatiana S.
Goryunov Yu.V.
Bresler Michael S.
Iga Fumitoshi
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| Source Title |
Physical Review B - Condensed Matter and Materials Physics
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| Volume | 68 |
| Issue | 1 |
| Start Page | 014425-1 |
| End Page | 014425-7 |
| Abstract |
Electron spin resonance (ESR) from Yb3+ ions in a single crystal of fluctuating valence compound YbB12 was studied. We have observed two main lines symmetrically displaced from a g value of 2.55 and exhibiting modulation with 5% anisotropy, when the magnetic field was rotated in the (110) plane from the cubic axis to the [110] direction. Experimental results are explained by an existence of Yb-Yb pairs which are coupled by isotropic exchange but interact also with the other pairs by dipole and exchange coupling. A strong temperature dependence of the amplitude of the ESR signals is found and interpreted as a result of capture of electrons by Yb3+ ions from electron traps with a binding energy of 18 K. The occurrence of a slight anisotropy in a cubic semiconductor may be the result of a spontaneous break of symmetry specific for the ground state of a Kondo dielectric.
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
American Physical Society
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| Date of Issued | 2003-07-24 |
| Rights |
Copyright (c) 2003 American Physical Society.
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[ISSN] 0163-1829
[DOI] 10.1103/PhysRevB.68.014425
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.68.014425
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