pressure effect on the superconductivity of hgba 2 ca 2 cu 3 o 8+ 2010.11.17 shimizu lab. m1 kamada...
TRANSCRIPT
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Pressure effect on the superconductivity of HgBa2Ca2Cu3O8+
2010.11.17
Shimizu Lab. M1 KAMADA Yukihiro
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Contents
• Introduction– The world record of the Tc
– Pressure effect on HgBa2Ca2Cu3O8+ (previous work)– Tc depends on…– Motivation
• Experiment– About diamond-anvil cell (DAC)– High purity of the samples– The amount of the doping carriers– Method of measuring electrical resistance under high pressure with DAC– Method of cooling & determination of the pressure– Experimental result– Discussion
• Summary
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The world record of the Tc
Introduction
Tc = 164 K @ 31 GPa
World record of high-Tc!
※ Superconductivity ・ Electrical resistance is Zero ・ Meissner effect
(perfect diamagnetism)
Its superconductivity can’t be explained with BCS theory.
The mechanism of superconductivity still has many mysteries.
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Pressure effect on HgBa2Ca2Cu3O8+ (previous work)
The electrical resistivity of Hg-1223 under high pressure
Pressure dependence of the Tc of Hg-series cuprate
L. Gao et al., Phys. Rev. B 50, 4260 (1994)
Introduction
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SCAFM AFM
quasi-gap
SC
under dope over dope
optimal dopeoptimal dopeTemperature
00.15 0.15 ~0.20electron hole
Tc depends on…
>0, supplying holes into the CuO2 layers
HgBa2Cam-1CumO2m+2+
m = 3 is the best for high-Tc @ ambient pressure.
aa
c
The carrier concentration
Pressure effect is not only changing lattice constant but also changing hole distribution between CuO2 layers etc…
Introduction
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Tc depends on…
F.Nakamura, J.Hori, T.Goko, Y.Uno, N.Kikugawa and T.Fujita, Journal of Low Temperature Physics, Vol. 117. Nos. 5/6, 1999
Xiao-Jia Chen, Viktor V. Struzhkin, Yong Yu, Alexander F. Goncharov, Cheng-Tian Lin, Ho-kwang Mao & Russell J. Hemley, Nature 466, (2010) 950–953
La2-xSrxCuO4 Bi2Sr2Ca2Cu3O10+
Introduction
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Motivation
• Try to make a new world record!– High purity of the sample– The amount of the doping carriers– To control the pressure condition– Higher pressure– And so on…
Introduction
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About diamond-anvil cell (DAC)
gasket
pressuremedium
sample
Diamond Anvil Cell(DAC)
6 cm
3 cmdiamond
diamond
To explain easily, this picture is the DAC which keeps the pressure by screw.In this experiment, I used the DAC which apply the pressure by gas-pressure system.
※
Experiment
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SCAFM
quasi-gap
SC
under dope over dope
optimal dopeoptimal dopeTemperature
00.15 0.15 ~ 0.20electron hole
High purity of the samples
• Sample 1 (S1) & Sample 2 (S2)
– Purity (Hg-1223 : 90%~)
• Sample 1 (S1) : Tc = 134 K @ ambient pressure
– To control a little under doped (annealing in a vacuum)
• Sample 2 (S2) : Tc = 130 K @ ambient pressure
– Not to control doping carriers
Experiment
The amount of the doping carriers
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To control the pressure condition
• Sample 2 (S2)– Hydrostatic
• With pressure medium (NaCl)
– Non-hydrostatic• Without pressure medium
Experiment
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Method of measuring electrical resistance under high pressure with DAC
Gasket(SUS310S)
Electrical probe (Pt foil)
Pressure Medium(NaCl)
sample
Pressure marker (Ruby chip)
Insulator(c-BN powder + epoxy)
Electrical probe(Au wire)
300 m100 m
1.8 GPa
Sample 2
Hydrostatic (with NaCl) (Sample 1, Sample 2)
※ with microscope.
AC four probe method ※ S1:pserud four probe method
Experiment
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Method of measuring electrical resistance under high pressure with DAC
Gasket(SUS310S)
Electrical probe (Pt foil)
sample
Pressure marker (Ruby chip)
Insulator(c-BN powder + epoxy)
300 m
Non-hydrostatic (without pressure medium) (Sample 2)
Sample 2 100 m
0.85 GPa
※ with microscope.
AC four probe method
Experiment
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Method of cooling & determination of the pressure
Low temperature generator : Pulse Tube refrigerator (low vibration)
Gas type DAC
different type
Gas type DAC can change the pressure at low temperature.(DAC in the refrigerator)
Measured with PC
CameraPressure determination:• Ruby fluorescence method• Raman shift of diamond
Experiment
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Experimental result
Hg-1223 (S1) with NaCl
Hg-1223 (S2) with NaCl
Experiment
Hydrostatic (with NaCl) (Sample 1, Sample 2)
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Experimental result
Hg-1223 (S2) with no pressure medium
Tco
Tc
Hg-1223 (S1) at 0.7 GPa
The Tc was defined by same method of the world record
Definition of the Tc
Experiment
Non-hydrostatic (without pressure medium) (Sample 2)
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Experimental result
Pressure dependence of Tc about Sample 1 (carrier controlled) and Sample 2 (non-controlled)
Hg-1223 (S1 and S2) with NaCl
The pressure effect of the Tc depends on the sample
Experiment
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Experimental result
Pressure dependence of Tc with pressure medium and without pressure medium about Sample 2
?
The pressure effect of the Tc depends on the way how to apply the pressure
Hg-1223 (S2)
Experiment
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Discussion
L. Gao et al., Phys. Rev. B 50, 4260 (1994)
Comparing the previous work to my work
Hg-1223 (S1 and S2) with NaCl
Carrier density?But, can’t find any clear reasons.
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Discussion
Phase transition?
The change of the Tc by applying the pressure is not continuous
The other discussion…
Hg-1223 (S1 and S2) with NaCl
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Summary
• From this experiment– Can’t make the new world record…– Phase transition?
• Future– 1. Higher pressure– 2. X-ray diffraction measurement– 3. Uniaxial pressure– 4. Best condition of the pressure
The new world record of the Tc!?