Research Unit FOR538
Doping Dependence of Phase Transitions and Ordering Phenomena in Copper-Oxygen Superconductors

P4 Crystal Growth of Superconducting Cuprates

Andreas Erb, Michael Lambacher, Astrid Habel and Rudolf Gross

In 2004 the DFG (Deutsche Forschungsgemeinschaft) founded the research unit FOR 538: ” Doping Dependence of Phase Transitions and Ordering Phenomena in Cuprate Superconductors ”, which consisted of 7 different projects, one of which is ”Crystal Growth of p and n-doped cuprate superconductors”. Goal of this project is the growth and characterization of high purity single crystals of the high temperature superconductors to provide samples for different spectroscopic experiments within the ”Research Unit High Temperature Superconductivity”. By the end of the year 2006 the renewed proposal for the Research united was not only reviewed positively again, but was even enlarged and now consists of 9 groups. The project crystal growth within the research unit is of particular importance in that sense, that it provides the common sample basis to the different experimental projects within the research unit. Only such a common sample basis of high quality single crystals of the cuprates makes the comparison of the results obtained by the various experimental techniques reliable.

Sample Space

Goal of this project is the growth and characterization of high purity single crystals of the high temperature superconductors to provide samples for different spectroscopic experiments within the "Forschergruppe High Temperature Superconductivity". In order to cover the whole phase diagram of the high temperature superconductors we want to grow crystals with well defined and homogeneous doping of both, the p- and n-doped compounds.

In order to cover the whole phase diagram of the high temperature superconductors, which is one of the central ideas of this research unit, crystals with well defined and homogeneous doping of both, the p and n-doped compounds need to be grown. On the hole doped side of the phase diagram we focused on the systems of YBa2Cu3O7-δ and Bi2Sr2CaCu2O8. There are restrictions in the accessible doping regime for the YBa2Cu3O7-δ even when co-doping with Ca is applied (see Fig. 1).

 

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Fig 1: Accessible regions of the phase diagram for the different compounds of the high temperature superconductors
 

For the Bi2Sr2CaCu2O8 system one is actually limited to a relatively small region around optimal doping. For this reason we have started to grow single crystals of the La2-xSrxCuO4 system, since they can be used to access the reminder part of the phase diagram as well as it is possible to access the whole doping range of the hole doped side by using one compound only. Moreover, they allow a more direct comparison of the n- and p-doped side of the phase diagram, due to the similarity of both the critical temperature and the structure with the electron doped 214-compounds. For the electron doped side of the phase diagram only 214-compounds are available to probe the phase diagram. We concentrated our efforts on the crystal growth of Pr2-xCexCuO4, Nd2-xCexCuO4, Sm2-xCexCuO4 or mixtures such as LaPr1-xCexCuO4.
 

 

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Fig 2: Single crystal of La2-xSrxCuO4 grown in the mirror furnace at WMI. The last about 6 cm on the left end of the sample are formed by a single crystallite.

 

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Fig 3: Transition curves for single crystals of the  La2-xSrxCuO4 series  grown in the mirror furnace at WMI.

 
 

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Fig 4: Transition curves for the electron doped 214 systems  single crystals of the  Nd2-xCexCuO4 and Pr2-xCexCuO4

 


For more information you may read the annual report of the Crystal Growth group of the WMI.
 

 

Selected Papers:

url
Unadulterated spectral function of low-energy quasiparticles in Bi2Sr2CaCu2O8 + δ
D.V. Evtushinsky, A.A. Kordyuk, S.V. Borisenko, V.B. Zabolotnyy, M. Knupfer, J. Fink, B. Buchner, A.V. Pan, A. Erb,
C.T. Lin & H. Berger
Phys. Rev. B
74
,
172509
(2006)
url
Effect of Zn and Ni Impurities on the Quasiparticle Renormalization of Superconducting Bi-2212
V.B. Zabolotnyy, S.V. Borisenko, A.A. Kordyuk, J. Fink, J. Geck, A. Koitzsch, M. Knupfer, B. Buchner, H. Berger,
A. Erb, C.T. Lin, B. Keimer & R. Follath
Phys. Rev. Lett.
96
,
037003
(2006)
url
Raman study of ordering phenomena in copper-oxygen systems
R. Hackl, L. Tassini, F. Venturini, A. Erb, Ch. Hartinger, N. Kikugawa & T. Fujita
Journal of Physics and Chemistry of Solids
67
,
289-293
(2006)
url
Triangular to Square Flux Lattice Phase Transition in YBa2Cu3O7
S.P. Brown, D. Charalambous, E.C. Jones, E.M. Forgan, P.G. Kealey, A. Erb & J. Kohlbrecher
Phys. Rev. Lett.
92
,
067004
(2004)
doi
Diagonal Antiferromagnetic Easy Axis in Lightly Hole Doped Y1-xCaxBa2Cu3O6
A. Jánossy, T. Fehér & A. Erb
Phys. Rev. Lett.
91
,
177001
(2003)
url
Experimental evidence for fast cluster formation of chain oxygen vacancies in YBa2Cu3O7-δ as the
origin of the fishtail anomaly
A. Erb, A.A. Manuel, M. Dhalle, F. Marti, J.Y. Genoud, B. Revaz, A. Junod, D. Vasumathi, S. Ishibashi, A. Shukla,
E. Walker, O. Fischer, R. Flukiger, R. Pozzi, M. Mali & D. Brinkmann
Solid State Communications
112
,
245-249
(1999)
url
Comparative study of oxygen diffusion in rare earth REBa2Cu3O7-δ single crystals (RE = Y, Er, Dy)
with different impurity levels
M. Kläser, J. Kaiser, F. Stock, G. Müller-Vogt & A. Erb
Physica C
306
,
188-198
(1998)
doi
url
Reversible suppression of the so-called fishtail effect in ultra pure single crystals of
YBa2Cu3O7-δ achieved by proper oxygenation
A. Erb, J.-Y. Genoud, F. Marti, M. Däumling, E. Walker & R. Flükiger
Journal of Low Temperature Physics
105
,
1023-1028
(1996)
url
In-situ resistivity measurements during the oxygenation of YBa2Cu3O7-δ and Gd0.8Y0.2Ba2Cu3O7-δ
single crystals
A. Erb, B. Greb & G. Müller-Vogt
Physica C
259
,
83-91
(1996)
url
The use of BaZrO3 crucibles in crystal growth of the high-Tc superconductors. Progress in crystal
growth as well as in sample quality
A. Erb, E. Walker & R. Flükiger
Physica C
258
,
9-20
(1996)
url
BaZrO3: The solution for the crucible corrosion problem during the single crystal growth of high-Tc superconductors REBa2Cu3O7-δ; RE = Y, Pr
A. Erb, E. Walker & R. Flükiger
Physica C
245
,
245-251
(1995)
url
YBa2Cu3O7-δ-BaCuO2-CuO: investigations on the phase diagram and growth of single crystals II.
A. Erb, T. Traulsen & G. Müller-Vogt
Journal of Crystal Growth
137
,
487-492
(1994)
url
YBa2Cu3O7-δ-BaCuO2-CuO: investigations on the phase diagram and growth of single crystals I.
The system BaCuO2-CuOx
A. Erb, T. Biernath & G. Müller-Vogt
Journal of Crystal Growth
132
,
389-395
(1993)

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