Antiferromagnetic alignment and relaxation rate of Gd spins in the high temperature superconductor GdBa₂Cu₃O₇₋δ

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@article{0f80f0ceed414ad0a2a5607904fb8c4d,
title = "Antiferromagnetic alignment and relaxation rate of Gd spins in the high temperature superconductor GdBa₂Cu₃O₇₋δ",
abstract = "The complex surface impedance of a number of GdBa2Cu3O7-delta single crystals has been measured at 10, 15, and 21 GHz using a cavity perturbation technique. At low temperatures a marked increase in the effective penetration depth and surface resistance is observed associated with a frequency dependent paramagnetic and antiferromagnetic alignment of the Gd spins. The effective penetration depth has a sharp change in slope at the Neel temperature, T(N)similar to2.2 K, with a peak in the surface resistance slightly above. The observed temperature and frequency dependence can he described by a model which assumes a negligibly small interaction between the Gd spins and the electrons in the superconducting state, with a frequency dependent magnetic susceptibility and a Gd spin relaxation time tau (s) being a strong function of temperature. Above T-N, tau (s), has a component varying as 1/(T-T-N), while below T-N it increases similar toT(-5).",
author = "Rodrigo Ormeno and Colin Gough and Guang Yang",
year = "2001",
month = mar,
day = "1",
doi = "10.1103/PhysRevB.63.104517",
language = "English",
volume = "63",
pages = "104517",
journal = "Physical Review B",
issn = "1098-0121",
publisher = "American Physical Society (APS)",
number = "10",

}

RIS

TY - JOUR

T1 - Antiferromagnetic alignment and relaxation rate of Gd spins in the high temperature superconductor GdBa₂Cu₃O₇₋δ

AU - Ormeno, Rodrigo

AU - Gough, Colin

AU - Yang, Guang

PY - 2001/3/1

Y1 - 2001/3/1

N2 - The complex surface impedance of a number of GdBa2Cu3O7-delta single crystals has been measured at 10, 15, and 21 GHz using a cavity perturbation technique. At low temperatures a marked increase in the effective penetration depth and surface resistance is observed associated with a frequency dependent paramagnetic and antiferromagnetic alignment of the Gd spins. The effective penetration depth has a sharp change in slope at the Neel temperature, T(N)similar to2.2 K, with a peak in the surface resistance slightly above. The observed temperature and frequency dependence can he described by a model which assumes a negligibly small interaction between the Gd spins and the electrons in the superconducting state, with a frequency dependent magnetic susceptibility and a Gd spin relaxation time tau (s) being a strong function of temperature. Above T-N, tau (s), has a component varying as 1/(T-T-N), while below T-N it increases similar toT(-5).

AB - The complex surface impedance of a number of GdBa2Cu3O7-delta single crystals has been measured at 10, 15, and 21 GHz using a cavity perturbation technique. At low temperatures a marked increase in the effective penetration depth and surface resistance is observed associated with a frequency dependent paramagnetic and antiferromagnetic alignment of the Gd spins. The effective penetration depth has a sharp change in slope at the Neel temperature, T(N)similar to2.2 K, with a peak in the surface resistance slightly above. The observed temperature and frequency dependence can he described by a model which assumes a negligibly small interaction between the Gd spins and the electrons in the superconducting state, with a frequency dependent magnetic susceptibility and a Gd spin relaxation time tau (s) being a strong function of temperature. Above T-N, tau (s), has a component varying as 1/(T-T-N), while below T-N it increases similar toT(-5).

U2 - 10.1103/PhysRevB.63.104517

DO - 10.1103/PhysRevB.63.104517

M3 - Article

VL - 63

SP - 104517

JO - Physical Review B

JF - Physical Review B

SN - 1098-0121

IS - 10

ER -