Electron spin-lattice relaxation in noncommon metals YBa2Cu3Ox and Rb1C60

Ацаркин, В. А.; Демидов, В. В.; Vasneva, G. A.

doi:10.1007/bf03162018

Cited by 7 publications

(13 citation statements)

References 12 publications

(18 reference statements)

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“…The X-band EPR spectra of our Gd3 +-doped 123 samples taken below 120-150 K [7] show a resolved fine structure consistent with the published data [8,9]. When temperature increases, the fine structure progressively collapses into one central line due to exchange coupling with delocalized charge carriers, in agreement with the Barnes-Plefka theory [10].…”

supporting

confidence: 78%

“…Hence, the following relation should be expected: (2) where Spp is the peak-to-peak width of the 5/2-7/2 satellite; 8pp is its temperature-independent part; and y is the electron magnetogyric ratio. The experimental data (more precise than those reported in [7]) are shown in Fig. 4.…”

mentioning

confidence: 79%

“…1). We [7] suspected revealing of electronic crossover related to the spin gap opening at T = T* , as suggested by Suter et al [ 19] to interpret some NMR anomalies near the same temperature.…”

mentioning

confidence: 80%

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Spin gap, phase separation and d-wave pairing as revealed by electron spin-lattice relaxation in 123 and 124 YBaCuO systems doped with Gd3+

et al. 2000

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With an original modulation technique, the Gd 3 + electron spin-lattice relaxation has been investigated in normal and superconducting states of YBa 2 Cu306+x (123) and YBa2Cu4G8 (124) compounds doped with 1 % Gd. In the 123 sample with x = 0.9 (T = 90 K), the T, behavior within 50 < T < 200 K reveals the [1 -tanh 2 (zl/2kT)]/T dependence typical of a spin gap opening with A 240 K. Below 50 K, the exponential slowing down of T, is limited by the Korringa-like behavior (TI T = const); the same Korringa-like law is found in the 123 sample with x = 0.59 (T = 56 K) within the total 4.2-200 K temperature range. This is interpreted in terms of microscopic separation of the normal and superconducting phases allowing for the electron spin cross-relaxation between them.In the 124 sample (T = 82 K), the Gd3 + relaxation rate below 60 K is found to obey a power law T" with an exponent n 3. Such a behavior (previously reported for nuclear spin relaxation) is indicative of the d-wave superconducting pairing. Additional paramagnetic centers characterized by relatively slow spin-lattice relaxation are found in both 123 and 124 systems. A well-pronounced change in the Ti temperature dependence at TT 180-200 K is observed for these slowly relaxing centers as well as for the conventional, fast-relaxing Gd 3 + ions, suggesting microscopic phase separation and a change in the relaxation mechanism due to electronic crossover related with the opening of the spin gap. This hypothesis is supported by some "180 K anomalies" previously reported by other authors.Among the puzzles of high-Te physics, three problems attracted special attention but remained unsolved for years. First, the so-called spin gap (or pseudo gap) which opens in underdoped oxide superconductors well above T c ; second, a microscopical (or mesoscopical) phase separation of spins and charges in high-Tc materials; and, finally, the competition between s-and d-wave superconducting pairing below T. In our contribution, some information on these topics as obtained with the help of electron paramagnetic resonance (EPR) and, especially, electron spin-lattice relaxation will be presented.

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confidence: 78%

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confidence: 79%

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Spin gap, phase separation and d-wave pairing as revealed by electron spin-lattice relaxation in 123 and 124 YBaCuO systems doped with Gd3+

et al. 2000

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“…LODESR phase has also been used by Atsarkin et al (39,40), but only to measure spin-lattice relaxation in the case T 1e T 2e . Both expressions [4] and [5] are valid for both homogeneous and inhomogeneous lines in the case T 1e T 2e .…”

Section: Figmentioning

confidence: 98%

Electron Spin Relaxation Time Measurements Using Radiofrequency Longitudinally Detected ESR and Application in Oximetry

Panagiotelis

Nicholson

Hutchison

2001

Journal of Magnetic Resonance

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“…Experimental and theoretical investigation of electron spin resonance (ESR) spectra and various relaxational data in the polymer phase of RbC bp fulleride in a temperature range 4.2 < T < 300 K were reported in [1][2][3] and references therein. Their results are as follows.…”

Section: Introductionmentioning

confidence: 99%

Coupled (localized+delocalized) electron spins dynamics in polymer phase of RbC60 fulleride

Fokina

Khutsishvili

1999

Appl. Magn. Reson.

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The transverse response (transverse dynamic susceptibility) of coupled localized (s) and delocalized (e) electron spins of a metal paramagnet as well as the longitudinal dynamic response of such a system (to be registered by a longitudinal coil) to the modulation of microwave power saturating electron spin resonance (ESR) are calculated. The ESR spectrum is analytically decomposed into two Lorentzians with normal resonance frequencies and decay rates of the coupled localized +delocalized electron spin system. In the case of relaxationally coupled s-and e-spins the longitudinal response is decomposed into two "relaxational" Lorentzians squared with amplitudes containing ESR lineshapes with above-mentioned shifted frequencies and linewidths as well as enhancement-suppression coefficients of magnetization evolution. These results are essential for the interpretation of experiments on longitudinal response in metal paramagnets, the latter being the source of important information on longitudinal electron relaxation; in particular, for extraction of information from longitudinal response experiments in the polymer phase of RbC 60 fulleride, where the obtained results describe the observed form of the ESR spectrum and the main features of the longitudinal response.

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Electron spin-lattice relaxation in noncommon metals YBa2Cu3Ox and Rb1C60

Cited by 7 publications

References 12 publications

Spin gap, phase separation and d-wave pairing as revealed by electron spin-lattice relaxation in 123 and 124 YBaCuO systems doped with Gd3+

Spin gap, phase separation and d-wave pairing as revealed by electron spin-lattice relaxation in 123 and 124 YBaCuO systems doped with Gd3+

Electron Spin Relaxation Time Measurements Using Radiofrequency Longitudinally Detected ESR and Application in Oximetry

Coupled (localized+delocalized) electron spins dynamics in polymer phase of RbC60 fulleride

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