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Tsui, Ophelia Kwan Chui; Ong, N. P.; Matsuda, Yuji; Yan, Y. F.; Peterson, Jim

doi:10.1103/physrevlett.73.724

Cited by 191 publications

(67 citation statements)

References 7 publications

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“…Singular frequency dependence of Z(ω) is due to retardation caused by electromagnetic wave propagation inside dielectric, Eq. (17). Thus boundary conditions also exhibit retardation effect.…”

Section: Outside Dielectric Mediamentioning

confidence: 96%

“…The first indication of the intrinsic Josephson effect was observation of switching of individual junctions to the resistive state in the I-V characteristics [14]. After that many Josephson effects have been found in these systems including the Fraunhofer patterns in the dependence of the critical current on the dc magnetic field applied parallel to the layers [15], Josephson plasma resonance [16] strongly affected by pancake vortices in the presence of the magnetic field applied perpendicular to the layers [17,18], Shapiro steps in the I-V characteristics induced by external microwave radiation [19,20], and Fiske resonances [21,22,23] One can anticipate much smaller variations of intrinsic-junction parameters in comparison with the artificially-fabricated junction arrays. In addition, the intrinsic junctions are much closer to each other and one can anticipate much stronger coupling between them.…”

Section: Introductionmentioning

confidence: 99%

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Radiation from Flux Flow in Josephson Junction Structures

Bulaevskiǐ

Koshelev

2006

J Supercond

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We derive the radiation power from a single Josephson junction (JJ) and from layered superconductors in the flux-flow regime. For the JJ case we formulate the boundary conditions for the electric and magnetic fields at the edges of the superconducting leads using the Maxwell equations in the dielectric media and find dynamic boundary conditions for the phase difference in JJ which account for the radiation. We derive the fraction of the power fed into JJ transformed into the radiation. In a finite-length JJ this fraction is determined by the dissipation inside JJ and it tends to unity as dissipation vanishes independently of mismatch of the junction and dielectric media impedances. We formulate also the dynamic boundary conditions for the phase difference in intrinsic Josephson junctions in highly anisotropic layered superconductors of the Bi 2 Sr 2 CaCu 2 O 8 type at the boundary with free space. Using these boundary conditions, we solve equations for the phase difference in the linear regime of Josephson oscillations for rectangular and triangular lattices of Josephson vortices. In the case of rectangular lattice for crystals with the thickness along the c-axis much larger than the radiation wavelength we estimate the radiation power per unit length in the direction of magnetic field at the frequency 1 THz as ∼ N µW/cm for Tl 2 Ba 2 CaCu 2 O 8 and ∼ 0.04 N µW/cm for Bi 2 Sr 2 CaCu 2 O 8 . For crystals with thickness smaller than the radiation wavelength we found that the radiation power in the resonance is independent on number of layers and can be estimated at 1 THz as 0.5 W/cm (Tl 2 Ba 2 CaCu 2 O 8 ) and 24 mW/cm (Bi 2 Sr 2 CaCu 2 O 8 ). For rectangular lattice, due to superradiation regime, up to half of power fed into the crystal may be converted into the radiation. In the case of triangular or random lattice in the direction perpendicular to the layers the fraction of power converted into the radiation depends on the dissipation rate and is much lower than for rectangular lattice in the case of high-temperature superconductors with nodes in the gap.

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Section: Outside Dielectric Mediamentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Radiation from Flux Flow in Josephson Junction Structures

Bulaevskiǐ

Koshelev

2006

J Supercond

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“…Earlier JPR experiments include microwave cavity experiments on Bi 2 Sr 2 CaCu 2 O 8 at a fixed frequency on the order of 30-90 GHz utilizing the fact that the microwave absorption resonance peak can be tuned by temperature and magnetic field [4,5,6]. While these measurements demonstrate the existence of the JPR and are useful in probing the system over a narrow range of temperatures and fields, the pancake vortices from the required magnetic field alter the system.…”

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confidence: 99%

C-axis Josephson plasma resonance observed in Tl_2Ba_2CaCu_2O_8 superconducting thin films by use of terahertz time-domain spectroscopy

et al. 2001

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We have unambiguously observed the c-axis Josephson Plasma Resonance (JPR) in high-T c cuprate Tl 2 Ba 2 CaCu 2 O 8 superconducting thin films employing terahertz time-domain spectroscopy in transmission as a function of temperature in zero magnetic field. These are the first measurements of the JPR temperature dependence of a high-T c material in transmission. With increasing temperature, the JPR shifts from 705 GHz at 10 K to ∼170 GHz at 98 K corresponding to a c-axis penetration depth increasing from 20.1±0.6 µm to 84±9 µm. The linewidth of the JPR peak increases with temperature, indicative of an increase in the quasiparticle scattering rate. We have probed the onset of the c-axis phase coherence to ∼0.95T c . The JPR vanishes above T c as expected.

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“…Studies of the temperature and magnetic field dependence of the JPR provide useful insights into the pinning and thermal fluctuations of vortices in the cuprate family [5][6][7][8][9][10]. It is natural, to anticipate unusual magnetic field behavior in these highly anistropic materials.…”

Section: 72-h7425gzmentioning

confidence: 99%

“…74.25.Gz The Josephson plasma resonance (JPR) phenomenon [1][2][3] provides direct information about the Josephson coupling between the CuO 2 planes in the highly anisotropic high T c superconductors [4]. Studies of the temperature and magnetic field dependence of the JPR provide useful insights into the pinning and thermal fluctuations of vortices in the cuprate family [5][6][7][8][9][10]. It is natural, to anticipate unusual magnetic field behavior in these highly anistropic materials.…”

mentioning

confidence: 99%

Effects of Vortex Pinning and Thermal Fluctuations on the Josephson Plasma Resonance inTl2Ba2CaCu2
Dulić
¹
,
Hak
²
,
Marel
³

et al. 2001
Phys. Rev. Lett.
23
0
20
0
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Infrared spectroscopy has been used to investigate the temperature dependence and c-axis magnetic field dependence of the Josephson plasma resonance in optimally doped Tl2Ba2CaCu2O8 thin films, and underdoped YBa2Cu3O6.5 ortho -II single crystals. The resonances are directly related to the c-axis penetration depths, yielding low temperature, zero fields values of about 20 µm, and 7 µm respectively. While the temperature dependencies of the resonances in the two compounds are very similar, the magnetic field dependence in YBCO is much weaker. We attribute this weak magnetic field dependence to the lower anisotropy of YBCO, and discuss the observed behaviours in terms of thermal fluctuations and pinning of pancake vortices, valid for highly anisotropic layered superconductors. 74.25.Gz The Josephson plasma resonance (JPR) phenomenon [1][2][3] provides direct information about the Josephson coupling between the CuO 2 planes in the highly anisotropic high T c superconductors [4]. Studies of the temperature and magnetic field dependence of the JPR provide useful insights into the pinning and thermal fluctuations of vortices in the cuprate family [5][6][7][8][9][10]. It is natural, to anticipate unusual magnetic field behavior in these highly anistropic materials. Indeed, just as in any conventional type-II superconductor, if a DC magnetic field is applied perpendicular to the 2D planes it penetrates the sample in the form of vortices which, when the anisotropy is large, are not vortex lines but pancake vortices. For low magnetic fields and low temperatures, these pancake vortices may form a nearly perfect vortex lattice. Under these conditions there should be no magnetic field dependence of the JPR since ω 2 p (B, T ) = ω 2 p (0) cos(φ n,n+1 )(r) , where ω 2 p (0) is the plasma frequency in zero field, and φ n,n+1 (r) is the gauge-invariant phase difference between the neighboring layers n and n + 1 [8]. In zero field, φ n (r) is independent of r and independent of n for zero c-axis current. In non-zero field, φ n (r) becomes position dependent but φ n,n+1 (r) is everywhere zero, provided the vortex cores are lined up, as in a perfect lattice. However, due to the effects of pinning (at low temperatures), and thermal fluctuations (at higher temperatures) pancake vortices do not in general line up from layer to layer. Both regimes have been extensively studied theoretically by Bulaevskii and one of us (AEK) [9][10][11], but there is very little data on the JPR in the low magnetic field regime [7]. In this paper we present our studies of the temperature and field dependence of the JPR in two members of the high T c family with differing anisotropies.Two types of reflectivity spectra were measured, each optimized to the type of sample: First normal incidence reflectivity spectra were recorded of a mosaic made of six ac-oriented single crystals of YBa 2 Cu 3 O 6.5 with ortho-II oxygen ordering, and a superconducting transition temperature of 58K. The mosaic was held together with epoxy and had an area of 6mm 2 . Second...

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Sharp Magnetoabsorption Resonances in the Vortex State ofBi2Sr2Ca
Ophelia Kwan Chui Tsui
¹
,
N. P. Ong
²
,
Yuji Matsuda
³

et al.

Cited by 191 publications

References 7 publications

Radiation from Flux Flow in Josephson Junction Structures

Radiation from Flux Flow in Josephson Junction Structures

C-axis Josephson plasma resonance observed in Tl_2Ba_2CaCu_2O_8 superconducting thin films by use of terahertz time-domain spectroscopy

Effects of Vortex Pinning and Thermal Fluctuations on the Josephson Plasma Resonance inTl2Ba2CaCu2
Dulić
¹
,
Hak
²
,
Marel
³

et al. 2001
Phys. Rev. Lett.
23
0
20
0
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Sharp Magnetoabsorption Resonances in the Vortex State ofBi2Sr2CaOphelia Kwan Chui Tsui1, N. P. Ong2, Yuji Matsuda3 et al.

Cited by 191 publications

References 7 publications

Radiation from Flux Flow in Josephson Junction Structures

Radiation from Flux Flow in Josephson Junction Structures

C-axis Josephson plasma resonance observed in Tl_2Ba_2CaCu_2O_8 superconducting thin films by use of terahertz time-domain spectroscopy

Effects of Vortex Pinning and Thermal Fluctuations on the Josephson Plasma Resonance inTl2Ba2CaCu2Dulić1, Hak2, Marel3 et al. 2001Phys. Rev. Lett.230200View full textAdd to dashboardCite

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Sharp Magnetoabsorption Resonances in the Vortex State ofBi2Sr2Ca
Ophelia Kwan Chui Tsui
¹
,
N. P. Ong
²
,
Yuji Matsuda
³

et al.

Effects of Vortex Pinning and Thermal Fluctuations on the Josephson Plasma Resonance inTl2Ba2CaCu2
Dulić
¹
,
Hak
²
,
Marel
³

et al. 2001
Phys. Rev. Lett.
23
0
20
0
View full text Add to dashboard Cite