Cu NMR Study of Bilayer HgBa2CaCu2O6+δ–Variation of Pseudo Spin-Gap Spectrum

Itoh, Yutaka; Tokiwa‐Yamamoto, A.; Machi, T.; Tanabe, K.

doi:10.1143/jpsj.67.2212

Cited by 16 publications

(73 citation statements)

References 19 publications

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“…1,3,4 So far, the scaling relation with zϭ2͓T 1 T/(T 2G ) 2 ϭconst͔ has been experimentally observed in overdoped and optimally doped systems. 4,5 By contrast, the ''zϭ1'' relation ͓T 1 T/T 2G ϭconst͔ predicted for the underdoped region has not been established yet. [5][6][7][8][9][10] This ambiguity arises from complications in the interpretation of 1/T 2G ; it has turned out that the spin-echo decay process is not so simple as had been considered before.…”

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confidence: 97%

Magnetic scaling in the underdoped superconductorHg0.8Re0.2Ba2

Goto¹,

Shimizu²,

Sastry

et al. 1999

Phys. Rev. B

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An approach has been made to deduce the second moment contribution of the planar Cu NMR line from indirect nuclear couplings, using the middle plane sites of the trilayer superconductor, Hg 0.8 Re 0.2 Ba 2 Ca 2 Cu 3 O 8 (T c ϭ126 K). We find that T 1 fluctuations of neighboring nuclear spins in the plane are the dominant causes of the spin-echo decay observed in the present case of an external field perpendicular to the c axis. Taking account of this effect in the analysis, the second moment is deduced. From the T dependences of the T 1 and second moment thus obtained, we find the dynamical exponent, zϭ2. The present result indicates that the boundary of z crossing from 2 ͑overdamped regime͒ to 1 ͑quantum critical regime͒ may be shifted more closely to the antiferromagnetic phase than previously assumed. It is also shown that the pseudogap is not a specific feature to the zϭ1 region. ͓S0163-1829͑99͒50922-3͔ RAPID COMMUNICATIONS R14 170PRB 59 GOTO, SHIMIZU, SASTRY, AND SCHWARTZ 24 This is the expression for the systems with axial symmetry, and in the static limit. RAPID COMMUNICATIONS R14 172PRB 59 GOTO, SHIMIZU, SASTRY, AND SCHWARTZ

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confidence: 97%

Magnetic scaling in the underdoped superconductorHg0.8Re0.2Ba2

Goto¹,

Shimizu²,

Sastry

et al. 1999

Phys. Rev. B

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“…The temperature dependence of the spin-spin relaxation time recently measured in high-T c cuprate superconductors [2][3][4][5] deviates from the expected behavior of a prevailing thoery.…”

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confidence: 99%

“…The temperature dependence of the spin-spin relaxation time recently measured in high-T c cuprate superconductors [2][3][4][5] deviates from the expected behavior of a prevailing thoery. [6] The observed relaxation time has strong temperature dependence for temperatures below the superconducting transition temparature, T < T c , while the theory predicts little temparature dependence.…”

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confidence: 99%

“…Such a temperature independence predicted by the theory was regarded as an evidence for the d-wave superconductivity and established by the measurements in La-and Y-systems. [7] On the other hand, the measurements in Tl-, Hg-and Bi-systems [2][3][4][5] revealed the insufficiency of the theory. [6] In this Short Note we clarify that the temperature independence is not a direct consequence of the theory by searching much wider parameter space than in the original work [6] and that the recent experiments [2][3][4][5] can be understood within the framework of the theory.…”

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Note on the Spin-Spin Relaxation Time in High-T_cCuprate Superconductors

Narikiyo

2001

J. Phys. Soc. Jpn.

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Recent experiments on the spin-spin relaxation time in high-Tc cuprate superconductors are discussed on the basis of the BCS-RPA theory.Keywords: spin-spin relaxation time, high-Tc cuprate superconductorThe temperature dependence of the spin-spin relaxation time recently measured in high-T c cuprate superconductors [2][3][4][5] deviates from the expected behavior of a prevailing thoery.[6] The observed relaxation time has strong temperature dependence for temperatures below the superconducting transition temparature, T < T c , while the theory predicts little temparature dependence. Such a temperature independence predicted by the theory was regarded as an evidence for the d-wave superconductivity and established by the measurements in La-and Y-systems. [7] On the other hand, the measurements in Tl-, Hg-and Bi-systems [2-5] revealed the insufficiency of the theory. [6] In this Short Note we clarify that the temperature independence is not a direct consequence of the theory by searching much wider parameter space than in the original work [6] and that the recent experiments [2-5] can be understood within the framework of the theory.The Gaussian component of the spin-spin relaxation time T

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