Breakpoint Phenomenon and Creation of Longitudinal Plasma Waves in Layered Superconductors

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Breakpoint Phenomenon and Creation of
Longitudinal Plasma Waves in Layered
Superconductors Yu.M.Shukrinov BLTP, JINR,
Dubna, , Russia In collaboration with
F.Mahfouzi (IASBS, Iran), P.Seidel (Jena
university, Germany), N.Pedersen (TUD, Denkmark),
A.Irie, G.I.Oya (Utsunomiya university) M.Suzuki
(Kyoto university)
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Plan of presentation

• Introduction
• - Excitations in N and
  S,
• - IVC in NIN-, NIS-,
  SIS-structures,
• - DC and AC Josephson
  effect
• - Intrinsic Josephson
  effect
• IVC in CCJJ model and CCJJDC model
• Longitudinal plasma wave in IJJ
• Breakpoint and breakpoint region structure

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?
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CCJJ-model (Koyama and Tachiki, 1996)
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CCJJ model
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Result of calculation
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M.Machida, T.Koyama
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CCJJ model
Shukrinov, F. Mahfouzi, Physica C 434 (2006)
6-12.
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CCJJDC model
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CCJJDC model
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Yu.M.Shukrinov, F.Mahfouzi.- Supercond.Sci.Techno
l. 20 (2007) S38-S42
CCJJDC model
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M. Machida, T. Koyama, and M. Tachiki, Phys. Rev.
Lett. 83, 4816 (1999).D. A. Ryndyk, Phys. Rev.
Lett. 80, 3376 (1998).
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Parametric resonance region of the equation
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t TmIo/dI
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Time dependence of charge oscillation on the
layers at periodic boundary condition at I
0.575 (breakpoint )
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IVC of the outermost branch for the stacks with
different number N of IJJ at g0 and at PBC
Yu.M.Shukrinov, F.Mahfouzi, N.F.Pedersen.
Phys.Rev.B 75, 104508 (2007).
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The ab-dependence of the BPC of the outermost
branch of IVC for stack of 10 IJJ at PBC.
Yu.M.Shukrinov, F.Mahfouzi.
Phys.Rev.Lett, 98, 157001 (2007)
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(a,b) - The a and b-dependence of the BPC at
PBC.(c) - Charge distribution among the
junctions in the stack for
different plasma modes.
Yu.M.Shukrinov, F.Mahfouzi. Phys.Rev.Lett,
98, 157001 (2007)
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(a)-Parametric resonance region (b) - Modeling
of the BPC for plasma modes with k p and k
2p/5 for stack of 10 IJJ at PBC (c), (d)-
Modeling of the BPC from resonance region.
(a)
(a)
(b)
(c)
(d)
Yu.M.Shukrinov, F.Mahfouzi. Phys.Rev.Lett,
98, 157001 (2007)
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Modeled and calculated ab-dependence of the BPC
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IVC of the stack of 11 IJJ and beta
dependence of the BPC
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The simulated IVC of the outermost branch in the
stack with different number of junctions
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The b-dependence of the BPC for the stacks with
different number of IJJ.
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The simulated IVC of the outermost branch in the
stacks with different number of junctions
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Breakpoint current Ibp
Experimental results Utsunomiya university
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Experimental IVC of BSCCO-2212 (Sample Ea, 10K)
Kyoto university, Japan
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Experimental IVC of BSCCO-2212 (Sample Eb, 35K)
Kyoto university, Japan
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BPR STRUCTURE
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Breakpoint region
X50mV/div Y100mA/div
The observation of the breakpoint region suggests
the excitation of the longitudinal plasma wave in
the mesa.
wJ2wp
fp1.97 THz
Experimental results Utsunomiya university
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Experimental results Utsunomiya university
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• you
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• your
• attention!