Isotope, pressure, and doping effects on the pseudogap in the LSCO-type compounds studied by neutron spectroscopy

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

doi:10.1016/j.physc.2004.03.126

Isotope, pressure, and doping effects on the pseudogap in the LSCO-type compounds studied by neutron spectroscopy

A. Furrer, K. Conder, P. Häfliger, A. Podlesnyak

Research output: Contribution to journal › Conference article › peer-review

9 Scopus citations

Abstract

Isotope, pressure, and doping effects on the pseudogap temperature T* were investigated by neutron spectroscopic experiments of the relaxation rate of crystal-field excitations in La_1.96-xSr_xHo _0.04CuO₄ (x=0.11, 0.15, 0.20). With increasing doping, T* is found to decrease from 80 K (x=0.11) to 60 K (x=0.15) and 50 K (x=0.20). The application of hydrostatic pressure (p=0.8 GPa) results in a downward shift of T* by 5 K for the optimally doped compound. Upon oxygen isotope substitution (¹⁸O vs ¹⁶O), T* is shifted upwards by 20, 10, and 5 K for x=0.11, x=0.15, and x=0.20, respectively. The large isotope and pressure effects indicate that lattice fluctuations are involved in the pseudogap phenomena. Our relaxation data are compatible with the unusual temperature dependence of the gap function in the pseudogap region, namely a breakup of the Fermi surface into disconnected arcs.

Original language	English
Pages (from-to)	773-774
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	408-410
Issue number	1-4
DOIs	https://doi.org/10.1016/j.physc.2004.03.126
State	Published - Aug 2004
Externally published	Yes
Event	Proceedings of the International Conference on Materials - Rio de Janeiro, Brazil Duration: May 25 2003 → May 30 2003

Funding

This work was performed at the spallation neutron source SINQ, Paul Scherrer Institut, Villigen, Switzerland. Financial support by the Swiss National Science Foundation (project no. 20-66949.01) and by the NCCR NaNEP project is gratefully acknowledged.

Funders	Funder number
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	20-66949.01

Keywords

Isotope effect
Neutron spectroscopy
Pseudogap

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10.1016/j.physc.2004.03.126

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title = "Isotope, pressure, and doping effects on the pseudogap in the LSCO-type compounds studied by neutron spectroscopy",

abstract = "Isotope, pressure, and doping effects on the pseudogap temperature T* were investigated by neutron spectroscopic experiments of the relaxation rate of crystal-field excitations in La1.96-xSrxHo 0.04CuO4 (x=0.11, 0.15, 0.20). With increasing doping, T* is found to decrease from 80 K (x=0.11) to 60 K (x=0.15) and 50 K (x=0.20). The application of hydrostatic pressure (p=0.8 GPa) results in a downward shift of T* by 5 K for the optimally doped compound. Upon oxygen isotope substitution (18O vs 16O), T* is shifted upwards by 20, 10, and 5 K for x=0.11, x=0.15, and x=0.20, respectively. The large isotope and pressure effects indicate that lattice fluctuations are involved in the pseudogap phenomena. Our relaxation data are compatible with the unusual temperature dependence of the gap function in the pseudogap region, namely a breakup of the Fermi surface into disconnected arcs.",

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T1 - Isotope, pressure, and doping effects on the pseudogap in the LSCO-type compounds studied by neutron spectroscopy

AU - Furrer, A.

AU - Conder, K.

AU - Häfliger, P.

AU - Podlesnyak, A.

PY - 2004/8

Y1 - 2004/8

N2 - Isotope, pressure, and doping effects on the pseudogap temperature T* were investigated by neutron spectroscopic experiments of the relaxation rate of crystal-field excitations in La1.96-xSrxHo 0.04CuO4 (x=0.11, 0.15, 0.20). With increasing doping, T* is found to decrease from 80 K (x=0.11) to 60 K (x=0.15) and 50 K (x=0.20). The application of hydrostatic pressure (p=0.8 GPa) results in a downward shift of T* by 5 K for the optimally doped compound. Upon oxygen isotope substitution (18O vs 16O), T* is shifted upwards by 20, 10, and 5 K for x=0.11, x=0.15, and x=0.20, respectively. The large isotope and pressure effects indicate that lattice fluctuations are involved in the pseudogap phenomena. Our relaxation data are compatible with the unusual temperature dependence of the gap function in the pseudogap region, namely a breakup of the Fermi surface into disconnected arcs.

AB - Isotope, pressure, and doping effects on the pseudogap temperature T* were investigated by neutron spectroscopic experiments of the relaxation rate of crystal-field excitations in La1.96-xSrxHo 0.04CuO4 (x=0.11, 0.15, 0.20). With increasing doping, T* is found to decrease from 80 K (x=0.11) to 60 K (x=0.15) and 50 K (x=0.20). The application of hydrostatic pressure (p=0.8 GPa) results in a downward shift of T* by 5 K for the optimally doped compound. Upon oxygen isotope substitution (18O vs 16O), T* is shifted upwards by 20, 10, and 5 K for x=0.11, x=0.15, and x=0.20, respectively. The large isotope and pressure effects indicate that lattice fluctuations are involved in the pseudogap phenomena. Our relaxation data are compatible with the unusual temperature dependence of the gap function in the pseudogap region, namely a breakup of the Fermi surface into disconnected arcs.

KW - Isotope effect

KW - Neutron spectroscopy

KW - Pseudogap

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M3 - Conference article

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VL - 408-410

SP - 773

EP - 774

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1-4

T2 - Proceedings of the International Conference on Materials

Y2 - 25 May 2003 through 30 May 2003

ER -

Isotope, pressure, and doping effects on the pseudogap in the LSCO-type compounds studied by neutron spectroscopy

Abstract

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Keywords

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