Pressure effect on the pseudogap in the optimally doped high-temperature superconductor

P. S. Häfliger; A. Podlesnyak; K. Conder; A. Furrer

doi:10.1209/epl/i2005-10373-x

All issues

Volume 73 / No 2 (January 2006)

Europhys. Lett., 73 2 (2006) 260-266

Abstract

Issue		Europhys. Lett. Volume 73, Number 2, January 2006


Page(s)		260 - 266
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2005-10373-x
Published online		02 December 2005

Europhys. Lett., 73 (2), pp. 260-266 (2006)

Pressure effect on the pseudogap in the optimally doped high-temperature superconductor $\chem{La_{1.81}Sr_{0.15}Ho_{0.04}Cu^{16}O_4}$

P. S. Häfliger¹, A. Podlesnyak¹, K. Conder² and A. Furrer¹

¹ Laboratory for Neutron Scattering, ETH Zurich & PSI Villigen CH-5232 Villigen PSI, Switzerland
² Laboratory for Developments and Methods, Condensed Matter Research with Neutrons and Muons - CH-5232 Villigen PSI, Switzerland

Received: 2 June 2005
Accepted: 4 October 2005

Abstract

The effect of hydrostatic pressure on the relaxation rate of crystal-field excitations in the optimally doped high-T_c superconductor $\chem{La_{1.81}Sr_{0.15}Ho_{0.04}Cu^{16}O_4}$ ( $T_c=32.5\un{K}$ ) has been investigated by means of inelastic neutron scattering. The temperature T^* where the pseudogap opens is found to shift downwards from $T^*=(61.0\pm1.3)\un{K}$ ( $p=0$ ) to $T^*=(55.8\pm1.5)\un{K}$ ( $p=0.8\un{GPa}$ ) and to $T^*=(54.1\pm1.5)\un{K}$ ( $p=1.2 \un{GPa}$ ), i.e., $\upd T^*/\upd p=(-5.9\pm1.6)\un{K/GPa}$ .

PACS: 74.62.Fj – Pressure effects / 76.30.Kg – Rare-earth ions and impurities / 78.70.Nx – Neutron inelastic scattering

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