Accessing the entire overdoped regime in pristine 
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 by application of pressure

Alireza, Patricia; Zhang, G. H.; Guo, Wei; Porras, J.; Loew, T.; Hsu, Yu-Te; Lonzarich, G. G.; Tacon, M. Le; Keimer, B.; Sebastian, Suchitra E.

doi:10.1103/physrevb.95.100505

Cited by 12 publications

(19 citation statements)

References 56 publications

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“…8. For the highest doping (black; p = 0.175), the linear extrapolation is reasonable and the uncertainty is small, so that T c (15 GPa) = 80 ± 5 K. Note that a recent study reports a linear decrease of T c with pressure in overdoped YBa 2 Cu 3 O 7 leading to a complete suppression above ∼ 10 GPa [46]. For the lowest two dopings, it is clear that T c (15 GPa) = 0 regardless of how one extrapolates to 15 GPa.…”

Section: Discussionmentioning

confidence: 63%

Sensitivity of Tc to pressure and magnetic field in the cuprate superconductor YBa2Cu3Oy

et al. 2018

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Cuprate superconductors have a universal tendency to form charge density-wave (CDW) order which competes with superconductivity and is strongest at a doping p 0.12. Here we show that in the archetypal cuprate YBa2Cu3Oy (YBCO) pressure suppresses charge order, but does not affect the pseudogap phase. This is based on transport measurements under pressure, which reveal that the onset of the pseudogap at T * is independent of pressure, while the negative Hall effect, a clear signature of CDW order in YBCO, is suppressed by pressure. We also find that pressure and magnetic field shift the superconducting transition temperature Tc of YBCO in the same way as a function of doping -but in opposite directions -and most effectively at p 0.12. This shows that the competition between superconductivity and CDW order can be tuned in two ways, either by suppressing superconductivity with field or suppressing CDW order by pressure. Based on existing high-pressure data and our own work, we observe that when CDW order is fully suppressed at high pressure, the so-called "1/8 anomaly" in the superconducting dome vanishes, revealing a smooth Tc dome which now peaks at p 0.13. We propose that this Tc dome is shaped by the competing effects of the pseudogap phase below its critical point p ∼ 0.19 and spin order at low doping.

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Section: Discussionmentioning

confidence: 63%

Sensitivity of Tc to pressure and magnetic field in the cuprate superconductor YBa2Cu3Oy

et al. 2018

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“…For planar O in Fig. 4b-c we find that 17 ν Q,c (field along the crystal c-direction) and 17 ν Q,σ (field along the Cu-O σ-bond) generally increase with pressure for all doping levels, although this is more pronounced for the underdoped 17 O along the σ-bond direction, and (c), 17 O along the crystal c-axis. For Y-6.9 both quadrupole frequencies reflecting the double peak feature of the satellite transitions are displayed (the error, indicated, is typically much less than the symbol size).…”

Section: High Pressure Nmr Experimentsmentioning

confidence: 82%

“…Therefore, our anvil cells are rather small compared to what is used by another group [12] that also engages in single crystal NMR experiments (of other materials) at similar pressures. We use 17 O exchanged small volume (0.3 to 1.5 nano-L) micro-crystals with 3 different stoichiometries: YBa 2 Cu 3 O 6.5 (Y-6.5), YBa 2 Cu 3 O 6.85 (Y-6.85), and YBa 2 Cu 3 O 6.9 (Y-6.9). These doping levels were originally determined from T c measurements (see Supplementary Sec.…”

Section: High Pressure Nmr Experimentsmentioning

confidence: 99%

“…Clearly, with the NMR results mentioned above, it appears intriguing to explore how pressure affects the charges in the CuO 2 plane at the atomic level. However, since this requires 63 Cu and 17 O NMR experiments on oriented single crystals at pressures that can only be achieved with anvil cell devices, such experiments are rather challenging: a micro-crystal surrounded by a radio frequency micro-coil needs to be positioned inside the pressurized region of an anvil cell, as depicted in Fig. 1a.…”

Section: Introductionmentioning

confidence: 99%

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How pressure enhances the critical temperature for high temperature superconductivity in YBa$_2$Cu$_3$O$_{6+y}$

Jurkutat¹,

Kattinger²,

Tsankov³

et al. 2021

Preprint

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FIG. 1. Anvil cell high-pressure excerted on YBa2Cu3O6+y changes the charges in the CuO2 plane. (a) Schematic of the anvil cell used for NMR; the micro-coil surrounds the single crystal of about 1 nano-L volume, and both are placed in the high pressure chamber with a ruby chip as an optical pressure gauge. (b) Sketch of the crystal structure of YBa2Cu3O6+y with highlighted bonding orbitals in one of the CuO2 planes. The charge content of these bonding orbitals can be measured with Cu and O NMR quadrupole splittings. As indicated in (c) it reflects the corresponding hole contents for Cu (n Cu ) and O (n O ), from which the NMR doping ζ follows (1 + ζ = n Cu + 2n O ).

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“…The high pressure measurements were performed in a miniature Moissanite anvil cell similar to the one employed in Refs. [29][30][31][32][33][34][35]. The culet diameter of the Moissanite anvils is 0.8 mm, and the pressure achieved was determined by the ruby fluorescence spectroscopy at room temperature.…”

mentioning

confidence: 99%

Nearly isotropic superconductivity in the layered Weyl semimetal WTe2 at 98.5 kbar

et al. 2017

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Layered transition metal dichalcogenide WTe2 has recently attracted significant attention due to the discovery of an extremely large magnetoresistance, a predicted type-II Weyl semimetallic state, and the pressure-induced superconducting state. By a careful measurement of the superconducting upper critical fields as a function of the magnetic field angle at a pressure as high as 98.5 kbar, we provide the first detailed examination of the dimensionality of the superconducting condensate in WTe2. Despite the layered crystal structure, the upper critical field exhibits a negligible field anisotropy. The angular dependence of the upper critical field can be satisfactorily described by the anisotropic mass model from 2.2 K (T /Tc ∼ 0.67) to 0.03 K (T /Tc ∼ 0.01), with a practically identical anisotropy factor γ ∼ 1.7. The temperature dependence of the upper critical field, determined for both H ⊥ ab and H // ab, can be understood by a conventional orbital depairing mechanism. Comparison of the upper critical fields along the two orthogonal field directions results in the same value of γ ∼ 1.7, leading to a temperature independent anisotropy factor from near Tc to < 0.01Tc. Our findings thus identify WTe2 as a nearly isotropic superconductor, with an anisotropy factor among one of the lowest known in superconducting transition metal dichalcogenides.The discovery of an extremely large and non-saturating magnetoresistance in semimetallic WTe 2 [1] has generated considerable research efforts [2][3][4][5][6][7][8][9][10][11]. The interest is further intensified with the prediction that WTe 2 can be a type-II Weyl semimetal, in which Weyl fermions emerge at the border between electron and hole pockets [12]. The crystal structure of WTe 2 consists of weaklybonded block-layers of W-Te atoms along the c direction. The layered nature of WTe 2 has facilitated the fabrication of devices based on thin layers of WTe 2 , enabling the application of gate voltage, and hence further exploration of fundamental physical properties in a controllable manner [8,[13][14][15][16].Another powerful tool to tune the properties of WTe 2 is pressure. With the application of pressure, superconductivity has been successfully induced in the bulk WTe 2 [17,18]. Although the temperature-pressure phase diagrams reported by two groups [17,18] are quite different, some qualitative similarities can still be observed. First, the superconducting transition temperature (T c ) takes a dome-shaped pressure dependence, with a maximum onset T c between 6.5 K and 7 K. Second, the magnetoresistance is significantly suppressed when the superconducting state sets in. In the work of Pan et al.[17], superconductivity can be induced with a pressure as low as ∼25 kbar, which is close to the pressure range where a subtle structural transformation from T d phase to 1T phase was detected via powder X-ray diffraction and Raman spectroscopy [19,20]. However, these results contradict the study of Kang et al. [18], which claims that the structure * skgoh@phy.cuhk.edu.hk of WTe...

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Accessing the entire overdoped regime in pristine YBa2Cu3O6+x by application of pressure

Cited by 12 publications

References 56 publications

Sensitivity of Tc to pressure and magnetic field in the cuprate superconductor YBa2Cu3Oy

Sensitivity of Tc to pressure and magnetic field in the cuprate superconductor YBa2Cu3Oy

How pressure enhances the critical temperature for high temperature superconductivity in YBa$_2$Cu$_3$O$_{6+y}$

Nearly isotropic superconductivity in the layered Weyl semimetal WTe2 at 98.5 kbar

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