Erratum: Quasiparticle and phonon lifetimes in superconductors

Kaplan, Steven B.; C., C.; Langenberg, D. N.; Chang, Joon-Hyuk; Jafarey, S.; Scalapino, D. J.

doi:10.1103/physrevb.15.3567

Cited by 20 publications

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“…The same calculation assuming an isotropic s-wave gap confirms the earlier result that t R and t i are equal for T ! T c in s-wave superconductors [21]. A small admixture of s-wave symmetry of the type "d 1 s" merely breaks the fourfold rotation symmetry of the quasiparticle dispersion, without affecting the physical picture.…”

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confidence: 99%

Nonequilibrium Superconductivity and Quasiparticle Dynamics Studied by Photoinduced Activation of mm-Wave Absorption

et al. 1997

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We present a study of nonequilibrium superconductivity in DyBa 2 Cu 3 O 72d using photoinduced activation of mm-wave absorption. We monitor the time evolution of the thin film transmissivity at 5 cm 21 subject to pulsed infrared radiation. In addition to a positive bolometric signal we observe a second, faster, decay with a sign opposite to the bolometric signal for T . 40 K. We attribute this to the unusual properties of quasiparticles residing near the nodes of an unconventional superconductor, resulting in a strong enhancement of the recombination time. [S0031-9007(97)04710-8] PACS numbers: 74.25.Gz, 63.20.Ls, 74.40. + k, The occurrence of zeros in the superconducting gap for certain values of the momentumh k at the Fermi surface of high T c superconductors has a number of intriguing consequences for the dynamical behavior and lifetime of the quasiparticles at low temperatures, which has only recently begun to attract the attention of researchers in the field. Because of the presence of these zeros (or nodes) the reduction in the superfluid fraction ( r s ) [1,2] and specific heat [3] is proportional to H 1͞2 , where H is the magnetic field. Also, a strong reduction of the quasiparticle scattering rate (1͞t) below T c [4][5][6] provides evidence that the dominant scattering mechanism has an electronic signature.In this Letter we present a study of the quasiparticle dynamics using photoinduced activation of mm-wave absorption (PIAMA). In this pump/probe experiment we use a free electron laser [7] (FELIX) which is continuously tunable from 100 to 2000 cm 21 as a pump to create a temporary excited state of a superconductor. FELIX produces macropulses with a stepwise "off-on-off " intensity profile ("on" for 3 , t , 7 ms in Fig. 1), consisting of 5000 micropulses (1-5 ps). The step response of the complex dielectric constant is monitored at 5 cm 21 using the combination of a backward wave oscillator (BWO) and a fast waveguide diode detector as a probe to measure the transmission through a superconducting film as a function of time. The mm-wave detector circuit was selected as a compromise between sensitivity and speed of detection, resulting in an overall time resolution of 1 ms. This choice of experimental parameters is optimal for the detection of small changes induced in the dielectric function by the infrared (IR) pulse at, as we will see, the scale of the lifetime of nonequilibrium superconductivity in high T c 's.We used films of DyBa 2 Cu 3 O 72d which were prepared by rf sputtering on LaAlO 3 substrates. The film thickness was 20 nm and T c was 88 K. Optimal surface quality was obtained by using Dy instead of Y. This substitution does not affect the superconducting properties. A detailed description of the preparation, characterization and the mm-wave dielectric properties of these films has been given elsewhere [8,9].The LaAlO 3 substrate supporting the film is plan parallel, with a thickness D 0.054 cm and a refractive index n 4.70. At k͞2p ഠ 5cm 21 , which is our probe frequency, the dielectric function...

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Nonequilibrium Superconductivity and Quasiparticle Dynamics Studied by Photoinduced Activation of mm-Wave Absorption

et al. 1997

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“…( 3) is Ohm's law. The values of τ in have been tabulated [30,31] for many materials. Following [32], we denote by 4L the perimeter of the loop, and therefore the flux that it encloses is 4LA.…”

Section: Basic Modelmentioning

confidence: 99%

The Stationary SQUID

Berger

2018

J Low Temp Phys

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In the customary mode of operation of a SQUID, the electromagnetic field in the SQUID is an oscillatory function of time. In this situation, electromagnetic radiation is emitted, and couples to the sample. This is a back-action that can alter the state that we intend to measure. A circuit that could perform as a stationary SQUID consists of a loop of superconducting material that encloses the magnetic flux, connected to a superconducting and to a normal electrode. This circuit does not contain Josephson junctions, or any other miniature feature. We study the evolution of the order parameter and of the electrochemical potential in this circuit; they converge to a stationary regime and the voltage between the electrodes depends on the enclosed flux. We obtain expressions for the power dissipation and for the heat transported by the electric current; the validity of these expressions does not rely on a particular evolution model for the order parameter. We evaluate the influence of fluctuations. For a SQUID perimeter of the order of 1µm and temperature 0.9T c , we obtain a flux resolution of the order of 10 −5 Φ 0 /Hz 1/2 ; the resolution is expected to improve as the temperature is lowered.

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Thermoelectric Effect in a Nonequilibrium Superconductor

Falco

1978

Thermoelectricity in Metallic Conductors

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Erratum: Quasiparticle and phonon lifetimes in superconductors

Cited by 20 publications

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Nonequilibrium Superconductivity and Quasiparticle Dynamics Studied by Photoinduced Activation of mm-Wave Absorption

Nonequilibrium Superconductivity and Quasiparticle Dynamics Studied by Photoinduced Activation of mm-Wave Absorption

The Stationary SQUID

Thermoelectric Effect in a Nonequilibrium Superconductor

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