Structure refinement for La1.85Sr0.15Cu1 − xNixO4 (x = 0–0.19) transition‐metal oxides

Minikayev, R.; Bezusyy, V.L.; Malinowski, A.

doi:10.1002/xrs.2645

Cited by 2 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After regrounding the pellets, the whole procedure was repeated two more times. The X-ray powder diffraction analysis confirmed the tetragonal K 2 NiF 4 -type structure and revealed no impurity phases in the final targets [29,30].…”

Section: Methodsmentioning

confidence: 67%

Ni-Driven Evolution of Pseudogap and Superconducting Gap in Underdoped Cuprate

2023

View full text Add to dashboard Cite

In the presented study, Ni impurity is used to probe pseudogap and superconducting gap in the underdoped cuprate La1.85Sr0.15CuO4. The longitudinal magnetoresistance measurements reveal the presence of local maximum at the same temperature Tmax, below which zero-field resistivity in the parallelresistor model deviates from its T 2 -dependence. Tracking the systematic evolution with Ni content y allows equating Tmax with pseudogap temperature T * . The rate of pseudogap closing by the magnetic field is consistent with the spin-paramagnetic effect, which is also the main pair-breaking process destroying superconductivity in the same field configuration. The thermal energy scale of pseudogap kBT * for y = 0 is equal to the relevant magnetic Zeeman energy scale. With increasing y, both energy scales separate from each other. The increased Stoner factor is partially responsible for the enhancement of the Pauli effect and the decrease of the Zeeman limiting field with increased y.

show abstract

Section: Methodsmentioning

confidence: 67%

Ni-Driven Evolution of Pseudogap and Superconducting Gap in Underdoped Cuprate

2023

View full text Add to dashboard Cite

show abstract

“…The temperature behavior of resistance was monitored on the small pieces cut from the targets. The x-ray powder diffraction analysis revealed no impurity phases in all the final targets and confirmed their tetragonal K 2 NiF 4 -type structure [27,29].…”

Section: Experimental Methodsmentioning

confidence: 68%

Pseudogap in underdoped cuprate seen in longitudinal magnetoresistance

Malinowski¹,

Bezusyy²,

Nowicki³

2022

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

We report the results of in-plane magnetotransport study of slightly underdoped cuprate La$_{1.85}$Sr$_{0.15}$CuO$_{4}$ (LSCO15) with Ni impurity. Increasing Ni content $y$ causes a sharp drop in longitudinal magnetoresistance (LMR) in LSCO15 to broaden and move towards higher temperatures. Temperature $T_{mLMR}(y)$ of this local maximum in LMR coincides with temperature $T_{dev}(y)$, below which ideal resistivity from the parallel-resistor model deviates from its $T^{2}$-dependence. A direct comparison with the hole doping evolution of pseudogap (PG) in La$_{2-x}$Sr$_{x}$CuO$_{4}$ (LSCO), possible through the mobile-carrier concentration extracted from the thermopower measurements, allows to equate both characteristic temperatures $T_{mLMR}\!\cong\!T_{dev}$ with PG opening temperature $T^{*}$. The rate of PG closing by magnetic field parallel to the CuO$_{2}$ plane, in measurements up to 9 T, is consistent with spin-paramagnetic effect in this configuration and yields PG closing field $B_{pc}$ close to the second critical field $B_{c2}$ predicted for superconducting gap with the help of Werthamer--Helfand--Hohenberg theory. The field anisotropy of $B_{pc}$ suggests that orbital degrees of freedom also play a role in PG formation.

show abstract

Structure refinement for La_1.85Sr_0.15Cu_1 − xNi_xO₄ (x = 0–0.19) transition‐metal oxides

Cited by 2 publications

References 29 publications

Ni-Driven Evolution of Pseudogap and Superconducting Gap in Underdoped Cuprate

Ni-Driven Evolution of Pseudogap and Superconducting Gap in Underdoped Cuprate

Pseudogap in underdoped cuprate seen in longitudinal magnetoresistance

Contact Info

Product

Resources

About