ThuliumV1, Main, Exploration, bibRecord, 002195

Observation of ultrafast spin-lattice relaxation in Tm2+-doped CaF2 and SrF2 crystals by optical means

Identifieur interne : 002195 ( Main/Exploration ); précédent : 002194; suivant : 002196

Observation of ultrafast spin-lattice relaxation in Tm2+-doped CaF2 and SrF2 crystals by optical means

Auteurs : T. Kohmoto [Japon] ; Y. Fukuda [Japon] ; M. Kunitomo [Japon] ; K. Isoda [Japon]

Source :

Physical review. B, Condensed matter [ 0163-1829 ] ; 2000-07-01.

RBID : Pascal:00-0300052

Descripteurs français

Pascal (Inist)
- 7847, 7660E, Etude expérimentale, Strontium composé, Calcium composé, Thulium, Aimantation, Relaxation spin électronique réseau, Spectre Raman, Température Debye, Dichroïsme circulaire magnétique.

English descriptors

KwdEn :
- Calcium compounds, Debye temperature, Electron spin-lattice relaxation, Experimental study, Magnetic circular dichroism, Magnetization, Raman spectra, Strontium compounds, Thulium.

Abstract

Ultrafast spin-lattice relaxation in the ground state of Tm²⁺ doped in CaF₂ and SrF₂ crystals is studied. The magnetization is created and detected by optical pulses, and spin-lattice relaxation times of the order of picoseconds or femtoseconds, which cannot be measured by the conventional electron spin resonance, can be obtained from the decay curves of the magnetization. It was found that the temperature dependences of the spin-lattice relaxation rate 1/T₁ near room temperature are deviated from the T⁹ dependence, which is expected from the well-known Raman process of phonons. Considering the effect of the Debye temperature θ_D of the host crystal on the Raman process, the observed temperature dependences of 1/T₁ are explained consistently both for Tm²⁺:CaF₂ (θ_D=513 K) and Tm²⁺:SrF₂ (θ_D=378 K).

Affiliations:

Japon

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Calcium compounds</term>
<term>Debye temperature</term>
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<term>Magnetization</term>
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<front><div type="abstract" xml:lang="en">Ultrafast spin-lattice relaxation in the ground state of Tm<sup>2+</sup>
 doped in CaF<sub>2</sub>
 and SrF<sub>2</sub>
 crystals is studied. The magnetization is created and detected by optical pulses, and spin-lattice relaxation times of the order of picoseconds or femtoseconds, which cannot be measured by the conventional electron spin resonance, can be obtained from the decay curves of the magnetization. It was found that the temperature dependences of the spin-lattice relaxation rate 1/T<sub>1</sub>
 near room temperature are deviated from the T<sup>9</sup>
 dependence, which is expected from the well-known Raman process of phonons. Considering the effect of the Debye temperature θ<sub>D</sub>
 of the host crystal on the Raman process, the observed temperature dependences of 1/T<sub>1</sub>
 are explained consistently both for Tm<sup>2+</sup>
:CaF<sub>2</sub>
 (θ<sub>D</sub>
=513 K) and Tm<sup>2+</sup>
:SrF<sub>2</sub>
 (θ<sub>D</sub>
=378 K).</div>
</front>
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<tree><country name="Japon"><noRegion><name sortKey="Kohmoto, T" sort="Kohmoto, T" uniqKey="Kohmoto T" first="T." last="Kohmoto">T. Kohmoto</name>
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<name sortKey="Fukuda, Y" sort="Fukuda, Y" uniqKey="Fukuda Y" first="Y." last="Fukuda">Y. Fukuda</name>
<name sortKey="Isoda, K" sort="Isoda, K" uniqKey="Isoda K" first="K." last="Isoda">K. Isoda</name>
<name sortKey="Kohmoto, T" sort="Kohmoto, T" uniqKey="Kohmoto T" first="T." last="Kohmoto">T. Kohmoto</name>
<name sortKey="Kunitomo, M" sort="Kunitomo, M" uniqKey="Kunitomo M" first="M." last="Kunitomo">M. Kunitomo</name>
</country>
</tree>
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</record>

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Observation of ultrafast spin-lattice relaxation in Tm2+-doped CaF2 and SrF2 crystals by optical means

Observation of ultrafast spin-lattice relaxation in Tm2+-doped CaF2 and SrF2 crystals by optical means

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri