mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-234Research ArticleСтатьиMicroscopic phase separation and two types of quasiparticles in lightly doped La2-xSrxCuO4 observed by electron paramagnetic resonance (in English)ShengelayaA.

Zürich CH-8057

BruunM.

Zürich CH-8057

MüllerK. A.

Zürich CH-8057

SafinaA.

Kazan, 420008

ConderK.

CH-5232 Villigen PSI

Physik-Institut der Universität ZürichSwitzerlandKazan State UniversityRussian FederationETH Zürich and PSISwitzerland20042201202461Special Issue191197Copyright © Shengelaya A., Bruun M., Müller K.A., Safina A., Conder K., 20242024Shengelaya A., Bruun M., Müller K.A., Safina A., Conder K.Shengelaya A., Bruun M., Müller K.A., Safina A., Conder K.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/234

In the low doping range of x from 0.01 to 0.06 in La2-xSrxCuO4 , we observed two electron paramagnetic resonance (EPR) signals: a narrow and a broad one. The narrow line is ascribed to metallic regions in the material, and its intensity increases exponentially upon cooling below  ~  150 K. The activation energy deduced ∆  = 460(50) K is nearly the same as that found in the doped superconducting regime by Raman and neutron scattering. Obtained results provide evidence of the microscopic phase separation and two type of quasiparticles in lightly doped La2-xSrxCuO4.

This work is supported by SNSF under the grant 7IP062595, AS are partially supported by INTAS-01-0654 and CRDF REC-007.ReferencesJ.G. Bednorz and K.A. Müller, Z. Phys. B 64, 189 (1986).J.G. Bednorz and K.A. Müller, Z. Phys. B 64, 189 (1986).See, for instance, Phase separation in Cuprate Superconductors, edited by K.A. Müller and G. Benedek (World Scientific, Singapore, 1993).See, for instance, Phase separation in Cuprate Superconductors, edited by K.A. Müller and G. Benedek (World Scientific, Singapore, 1993).J.H. Cho et al., Phys. Rev. Lett. 70, 222 (1993).J.H. Cho et al., Phys. Rev. Lett. 70, 222 (1993).Y. Ando et al., Phys. Rev. Lett. 88, 137005 (2002).Y. Ando et al., Phys. Rev. Lett. 88, 137005 (2002).A.N. Lavrov, S. Komiya and Y. Ando, Nature 418, 385 (2002).A.N. Lavrov, S. Komiya and Y. Ando, Nature 418, 385 (2002).V.J. Emery and S.A. Kivelson et al., Physica C 209, 597 (1993).V.J. Emery and S.A. Kivelson et al., Physica C 209, 597 (1993).T. Imai et al., Phys. Rev. Lett. 70, 1002 (1993).T. Imai et al., Phys. Rev. Lett. 70, 1002 (1993).A. Shengelaya et al., Phys. Rev. B 63, 144513 (2001).A. Shengelaya et al., Phys. Rev. B 63, 144513 (2001).B.I. Kochelaev et al., Phys. Rev. B 49, 13106 (1994).B.I. Kochelaev et al., Phys. Rev. B 49, 13106 (1994).Ch. Niedermayer et al., Phys. Rev. Lett. 80, 3843 (1998).Ch. Niedermayer et al., Phys. Rev. Lett. 80, 3843 (1998).L.K. Aminov and B. I. Kochelaev, Zh. Eksp. Theor. Fiz. 42, 1303 (1962).L.K. Aminov and B. I. Kochelaev, Zh. Eksp. Theor. Fiz. 42, 1303 (1962).R. Orbach and M. Tachiki, Phys. Rev. 158, 524 (1967).R. Orbach and M. Tachiki, Phys. Rev. 158, 524 (1967).B.I. Kochelaev et al., Mod. Phys. Lett. B 17, 415 (2003).B.I. Kochelaev et al., Mod. Phys. Lett. B 17, 415 (2003).V.V. Kabanov and D. Mihailovic, Phys. Rev. B 65, 212508 (2002).V.V. Kabanov and D. Mihailovic, Phys. Rev. B 65, 212508 (2002).D. Mihailovic and K. A. Müller, in High-Tc Superconductivity: Ten Years After the Discovery, E. Kaldis et al., eds. Kluwer Academic Publishers (1997) p. 243.D. Mihailovic and K. A. Müller, in High-Tc Superconductivity: Ten Years After the Discovery, E. Kaldis et al., eds. Kluwer Academic Publishers (1997) p. 243.T. Yoshida et al., Phys. Rev. Lett. 91, 027001 (2003).T. Yoshida et al., Phys. Rev. Lett. 91, 027001 (2003).A. Lanzara et al., Nature 412, 510 (2001).A. Lanzara et al., Nature 412, 510 (2001).A. Lanzara et al., unpublished.A. Lanzara et al., unpublished.X. J. Zhou et al., Nature 423, 398 (2003).X. J. Zhou et al., Nature 423, 398 (2003).Y. Ando et al., Phys. Rev. Lett. 87, 017001 (2001).Y. Ando et al., Phys. Rev. Lett. 87, 017001 (2001).F. Venturini et al., Phys. Rev. B 66, R060502 (2002).F. Venturini et al., Phys. Rev. B 66, R060502 (2002).D. Mihailovic et al., Europhys. Lett. 57, 254 (2002).D. Mihailovic et al., Europhys. Lett. 57, 254 (2002).

The authors declare that there are no conflicts of interest present.