Impact of nuclear dipoles on polarization echoes in glasses

Bazrafshan, M.; Fickenscher, G; Schickfus, M. von; Fleischmann, A.; Enss, C.

doi:10.1088/1742-6596/92/1/012135

Cited by 4 publications

(7 citation statements)

References 9 publications

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“…In particular, the qualitative explanation of the observed effect was given in [4,5,6]. In [7,8], numerical calculations of the dipole echo amplitude in glycerol in the magnetic field were performed and a good agreement with the experimental data was obtained.…”

Section: Introductionmentioning

confidence: 92%

“…The oscillations of the echo amplitude in a magnetic field were theoretically studied in [4,5,6,7,8]. In particular, the qualitative explanation of the observed effect was given in [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [9], we qualitatively and, in some cases, quantitatively compared our analytic expressions for the echo amplitude in glasses containing nuclear electric quadrupole moments with the experimental data. However, the existence of small oscillations of the dipole echo amplitude in glasses containing only spherical nuclei (without quadrupole moments), like in nondeuterated glycerol C 3 H 8 O 3 , remained unexplained until papers [7,8]. The presence of a small (0.037%) natural impurity of the 17 O isotope, which also has a nuclear quadrupole moment, did not explain these oscillations.…”

Section: Introductionmentioning

confidence: 99%

“…Bazrafshan et al [8] numerically calculated the echo amplitude in deuterated glycerol C 3 D 5 H 3 O 3 (taking into account all of the spins of hydrogen and the quadrupole moments of deuterium). It was assumed that the tunneling of the two-level system is the rotation of the glycerol molecule as a whole.…”

Section: Introductionmentioning

confidence: 99%

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Oscillations of echo amplitude in glasses in a magnetic field induced by nuclear dipole-dipole interaction

Шумилин¹,

Паршин

2009

Jetp Lett.

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The effect of a magnetic field on the dipole echo amplitude in glasses (at temperatures of about 10 mK) induced by the dipole-dipole interaction of nuclear spins has been theoretically studied. It has been shown that a change in the positions of nuclear spins as a result of tunneling and their interaction with the external magnetic field EH lead to a nonmonotonic magnetic field dependence of the dipole echo amplitude. The approximation that the nuclear dipole-dipole interaction energy E d is much smaller than the Zeeman energy EH has been found to be valid in the experimentally important cases. It has been shown that the dipole echo amplitude in this approximation may be described by a simple universal analytic function independent of the microscopic structure of the two-level systems. An excellent agreement of the theory with the experimental data has been obtained without fitting parameters (except for the unknown echo amplitude).

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oscillations of echo amplitude in glasses in a magnetic field induced by nuclear dipole-dipole interaction

Шумилин¹,

Паршин

2009

Jetp Lett.

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“…To explain this interesting phenomenon in nondeuterated glycerol Bazrafshan et al [8] suggested that the magnetic field dependence of the two-pulse echo amplitude in this case may be caused by the dipole-dipole interaction of the nuclear magnetic moments of hydrogen atoms. This interaction (along with Zeeman interaction) can also create a fine structure of two levels in TLS, which depends on the applied magnetic field.…”

Section: Introductionmentioning

confidence: 98%

A theory of the three-pulse electric-dipole echo in glasses in a magnetic field

Beltukov

Паршин

2010

Solid State Communications

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We extended existing theory of the two-pulse electric-dipole echo in glasses in a magnetic field to the three-pulse echo. As is well known, at low temperatures two-level systems (TLS's) are responsible for the echo phenomenon in glasses. Using a diagram technique in the framework of perturbation theory we derived a simple formula for the three-pulse echo amplitude. As in the case of two-pulse echo the magnetic field dependence of the tree-pulse echo amplitude in glasses is related to quadrupole electric moments of TLS's non-spherical nuclei and/or dipole-dipole interaction of their nuclear spins. These two mechanisms are responsible for the fine level splitting of TLS. As a result TLS transforms to multi-level system with the fine level splitting depending on a magnetic field. Due to existence in the theory the additional parameter T -the time interval between the second and the third pulses we have more reach spectrum of echo oscillations in a magnetic field in comparison with the case of the two-pulse echo.

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