Formation of magnetic moments in the cuprate superconductor Hg0.8Cu0.2Ba2Ca2Cu3O8+δ below Tc seen by NQR

Breitzke, Hergen; Eremin, I.; Manske, Dirk; Антипов, Е.В.; Lüders, Klaus

doi:10.1016/j.physc.2004.02.183

Cited by 10 publications

(5 citation statements)

References 27 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2(d) are separated due to the double differences in the quadrupole shifts and the spin Knight shifts at Cu(1) and Cu(2) for the O 2 -annealed Hg1223 with B 0 ⊥ c. More than two lines of Cu(2) spectra with B 0 ⊥ c in Fig. 2(d) indicate multiple ν Q (2)'s for the O 2 -annealed H1223, which are consistent with multiple zero-field NQR spectra [16].…”

Section: Cu Nmr Spectrasupporting

confidence: 58%

Uniform hole doping in HgBa$_{2}$Ca$_{2}$Cu$_{3}$O$_{8+δ}$ studied by $^{63}$Cu NMR

Itoh,

Ogawa,

Adachi

2019

Preprint

View full text Add to dashboard Cite

We studied local magnetic properties of triple-CuO2-layer superconductors HgBa2Ca2Cu3O 8+δ with rich 63 Cu isotope (underdoped Tc = 124 K and optimally doped Tc = 134 K) by 63 Cu NMR spin-echo techniques. The temperature dependences of the 63 Cu nuclear spin-lattice relaxation rate 63 (1/T1) and the spin Knight shift 63 Kspin of the inner plane Cu(1) site were nearly the same as those of the outer plane Cu(2) site in the normal states. The pseudogap temperature T * defined as the maximum temperature of 63 (1/T1T ) was 190 K for the underdoped Tc = 124 sample and 143 K for the optimally doped Tc = 134 K sample. The NMR results indicate the uniform hole distribution in the three layers, which is consistent with a coalescence of three-derived Fermi surfaces predicted by a band theory. The room temperature in-plane 63 K ab spin depends on whether the number of CuO2 planes per unit cell is even or odd for the Hg-based multilayer cuprate superconductors.

show abstract

Section: Cu Nmr Spectrasupporting

confidence: 58%

Uniform hole doping in HgBa$_{2}$Ca$_{2}$Cu$_{3}$O$_{8+δ}$ studied by $^{63}$Cu NMR

Itoh,

Ogawa,

Adachi

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…Thus, we identify material chemistry parameters, the hole contents at planar Cu and O, that are largely temperature independent, yet determine the superfluid density at low temperatures. This finding stimulates the use of these orbital hole contents, calculated from NMR literature data161819202122232425262728293031323334353637383940414243444546474849, to draw a three-dimensional cuprate phase diagram that encompasses all cuprate families and has the superconducting domes ordered according to the maximum T c . We argue that such a phase diagram might be very useful in discussing the complex properties of the cuprates.…”

mentioning

confidence: 80%

Perspective on the phase diagram of cuprate high-temperature superconductors

et al. 2016

View full text Add to dashboard Cite

Universal scaling laws can guide the understanding of new phenomena, and for cuprate high-temperature superconductivity the influential Uemura relation showed, early on, that the maximum critical temperature of superconductivity correlates with the density of the superfluid measured at low temperatures. Here we show that the charge content of the bonding orbitals of copper and oxygen in the ubiquitous CuO2 plane, measured with nuclear magnetic resonance, reproduces this scaling. The charge transfer of the nominal copper hole to planar oxygen sets the maximum critical temperature. A three-dimensional phase diagram in terms of the charge content at copper as well as oxygen is introduced, which has the different cuprate families sorted with respect to their maximum critical temperature. We suggest that the critical temperature could be raised substantially if one were able to synthesize materials that lead to an increased planar oxygen hole content at the expense of that of planar copper.

show abstract

“…Thus, the internal magnetic moments if they are present will result in an NQR line splitting. The first experimental evidence for the formation of the internal magnetic moments in the underdoped three-CuO 2 -layer Hg 0.8 Cu 0.2 Ba 2 Ca 2 Cu 3 O 8+δ (Hg-1223) high-T c cuprate superconductor below T c = 134 K has been presented by Breitzke et al 23 Using NQR technique they show that Cu NQR-lines split below T c due to a Zeeman splitting originating from the internal magnetic fields within the CuO 2 -layers. These results strongly favor a formation of staggered orbital currents as an origin of the observed phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Nonbonding oxygen holes and spinless scenario of magnetic response in doped cuprates

Moskvin

2004

Jetp Lett.

View full text Add to dashboard Cite

Both theoretical considerations and experimental data point to a more complicated nature of the valence hole states in doped cuprates than it is predicted by Zhang-Rice model. Actually, we deal with a competition of conventional hybrid Cu 3d-O 2p b1g ∝ d x 2 −y 2 state and purely oxygen nonbonding state with eux, y ∝ px,y symmetry. The latter reveals a non-quenched Ising-like orbital moment that gives rise to a novel spinless purely oxygen scenario of the magnetic response in doped cuprates with the oxygen localized orbital magnetic moments of the order of tenths of Bohr magneton. We consider the mechanism of 63,65 Cu-O 2p transferred orbital hyperfine interactions due to the mixing of the oxygen O 2p orbitals with Cu 3p semicore orbitals. Quantitative estimates point to a large magnitude of the respective contributions both to local field and electric field gradient, and their correlated character.

show abstract

Formation of magnetic moments in the cuprate superconductor Hg0.8Cu0.2Ba2Ca2Cu3O8+δ below Tc seen by NQR

Cited by 10 publications

References 27 publications

Uniform hole doping in HgBa$_{2}$Ca$_{2}$Cu$_{3}$O$_{8+δ}$ studied by $^{63}$Cu NMR

Uniform hole doping in HgBa$_{2}$Ca$_{2}$Cu$_{3}$O$_{8+δ}$ studied by $^{63}$Cu NMR

Perspective on the phase diagram of cuprate high-temperature superconductors

Nonbonding oxygen holes and spinless scenario of magnetic response in doped cuprates

Contact Info

Product

Resources

About