High-pressure effects in fluorinated

M. Monteverde; C. Acha; M. Núñez-Regueiro; D. A. Pavlov; K. A. Lokshin; S. N. Putilin; E. V. Antipov

doi:10.1209/epl/i2005-10247-3

All issues

Volume 72 / No 3 (November 2005)

Europhys. Lett., 72 3 (2005) 458-464

Abstract

Issue		Europhys. Lett. Volume 72, Number 3, November 2005


Page(s)		458 - 464
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2005-10247-3
Published online		30 September 2005

Europhys. Lett., 72 (3), pp. 458-464 (2005)

High-pressure effects in fluorinated $\chem{HgBa_2Ca_2Cu_3O_{8+\delta}}$

M. Monteverde¹^,2, C. Acha², M. Núñez-Regueiro¹, D. A. Pavlov³, K. A. Lokshin³, S. N. Putilin³ and E. V. Antipov³

¹ CRTBT, CNRS - BP166, 38042 Grenoble Cedex 09, France
² Laboratorio de Bajas Temperaturas, Departamento de Física, FCEyN Universidad de Buenos Aires, Ciudad Universitaria (C1428EHA) Buenos Aires, Argentina
³ Department of Chemistry, Moscow State University - Moscow 119992, Russia

Corresponding author: acha@df.uba.ar

Received: 25 April 2005
Accepted: 7 September 2005

Abstract

We have measured the pressure sensitivity of T_c in fluorinated $\chem{HgBa_2 Ca_2 Cu_3 O_{8+\delta}}$ (Hg-1223) ceramic samples with different F contents, applying pressures up to 30 $\un{GPa}$ . We obtained that T_c increases with increasing pressure, reaching different maximum values, depending on the F doping level, and decreases for a further increase of pressure. A new high T_c record ( $166 \un{K} \pm 1 \un{K}$ ) was achieved by applying pressure (23 $\un{GPa}$ ) in a fluorinated Hg-1223 sample near the optimum doping level. Our results show that all our samples are at the optimal doping, and that fluorine incorporation decreases the crystallographic a-parameter concomitantly increasing the maximum attainable T_c. This effect reveals that the compression of the a-axis is one of the keys that controls the T_c of high-temperature superconductors.

PACS: 74.72.Jt – Other cuprates, including Tl and Hg-based cuprates / 74.62.Fj – Pressure effects

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