Non-Fermi-liquid behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CaCu</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Ru</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Krimmel, A.; Günther, Axel; Kraetschmer, W.; Dekinger, H.; Büttgen, N.; Loidl, A.; Ebbinghaus, Stefan G.; Scheidt, E.‐W.; Scherer, Wolfgang

doi:10.1103/physrevb.78.165126

Cited by 49 publications

(48 citation statements)

References 58 publications

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“…The on-resonance spectrum bears strong similarity to the one of CuO. 32 Huge resonance features are observed, each corresponding to different Cu 3d 8 photon energy difference for resonant and non-resonant measurements (10 eV), the photoionization cross-sections for Cu 3d, Ru 4d, and O 2p are practically constant. The changes in the spectrum can therefore be attributed primarily to the Cu resonance process.…”

Section: Results C: Resonant Photoemissionmentioning

confidence: 75%

“…The simulation reproduces the experiment very well. The most important parameters determining the calculated lineshape are the following: (1) the Slater integrals, which give the energy positions of the atomic-like 3d 8 multiplet final states, and (2) the difference of U dd and the charge-transfer energy ∆, controlling the energies of the final states with ligand-hole character (3d 9 L and 3d 10 L 2 ) relative to those of the 3d 8 .…”

Section: Results C: Resonant Photoemissionmentioning

confidence: 99%

“…It exhibits unusual magnetic and transport properties. [7][8][9] For example, the temperature dependence of the magnetic susceptibility resembles very much that of CeSn 3 , as both compounds show a broad maximum around a characteristic temperature T * , which is about 200 K for CaCu 3 Ru 4 O 12 . Furthermore, an enhanced quasi-particle mass has been observed from specific heat measurements.…”

Section: Introductionmentioning

confidence: 99%

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Correlation effects in CaCu3Ru4O12

Hollmann

Maignan

et al. 2013

Phys. Rev. B

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We have investigated the electronic structure of CaCu3Ru4O12 and LaCu3Ru4O12 using soft x-ray photoelectron and absorption spectroscopy together with band structure and cluster configuration interaction calculations. We found the Cu to be in a robust divalent ionic state while the Ru is more itinerant in character and stabilizes the metallic state. Substitution of Ca by La predominantly affects the Ru states. We observed strong correlation effects in the Cu 3d states affecting the valence band line shape considerably. Using resonant photoelectron spectroscopy at the Cu L3 edge we were able to unveil the position of the Zhang-Rice singlet states in the one-electron removal spectrum of the Cu with respect to the Ru-derived metallic bands in the vicinity of the chemical potential.

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Section: Results C: Resonant Photoemissionmentioning

confidence: 75%

Section: Results C: Resonant Photoemissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlation effects in CaCu3Ru4O12

Hollmann

Maignan

et al. 2013

Phys. Rev. B

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“…The ruthenate CaCu 3 Ru 4 O 12 is a Pauli paramagnet with itinerant charge carriers showing heavy-fermion behavior [7]. For this compound, non-Fermiliquid [8] and intermediate-valence behavior [9] were reported. Strong correlation effects were also observed for the rare-earthsubstituted LnCu 3 Ru 4 O 12 (Ln = La, Pr, Nd) [10,11].…”

Section: Introductionmentioning

confidence: 97%

Magnetic and thermodynamic properties of the spin-dimer systemLa2RuO5induced by Mn substitution

et al. 2014

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Magnetic properties as well as the specific heat of the spin-dimer system La 2 Ru 1−y Mn y O 5 were investigated for manganese concentrations 0 y 0.25. The magnetic (dc) susceptibility of the unsubstituted (y = 0) system shows a steplike decrease close to 160 K reflecting a magnetostructural transition into a dimerized ground state. With increasing manganese concentration this behavior (typical for singlet formation) becomes continuously suppressed and the susceptibility bears the signatures of the emergence of new magnetic ground states. The high-temperature Curie-Weiss susceptibility can be described by Ru 4+ (S = 1) and Mn 4+ (S = 3 2 ) spin moments, with a dramatic decrease of the Curie-Weiss temperatures by almost 30% close to y = 0.1, indicating significant changes in the average mean magnetic exchange. Field-cooled and zero-field-cooled experiments as well as ac-susceptibility measurements provide clear evidence for the formation of a spin-glass state, well below the characteristic dimerization temperature. The relaxation dynamics can be described by a Vogel-Fulcher-Tammann behavior and indicates high fragility when characterized in terms of glassy dynamics of canonical supercooled liquids. Additional electron-spin resonance experiments indicate different spin-glass regimes and a rather dynamic nature of the dimerized phase. In the Mn-substituted compounds, a linear contribution to the heat capacity at low temperatures can be ascribed to the spin-glass formation. With increasing manganese concentration, the anomaly in the specific heat caused by the spin-singlet formation is shifted to lower temperatures and becomes continuously suppressed and smeared out. On the basis of these results, we propose a (y,T )-phase diagram indicating the competition of the spin-glass and the dimerized states. We stress the similarities with doped CuGeO 3 , the canonical inorganic spin-Peierls system.

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“…22 A possibility of the non-Fermi-liquid behavior is discussed below 1 K, and is compared with other heavy fermion compounds. 23,24 The concept of the delocalization of the Cu 2+ hole has also been examined in the related compounds, such as L 2/3 Cu 3 (Ti,Ru) 4 28,29 We emphasize that response to high magnetic fields is particularly important in the present system. 30 In the antiferromagnetic phase of x = 0, the exchange energy is evaluated to be 4 meV, 8 which is much smaller than that of La 2−x Sr x CuO 4 (100 meV).…”

Section: Introductionmentioning

confidence: 98%

High-field magnetization and magnetoresistance of theA-site ordered perovskite oxide CaCu3Ti4−x

et al. 2012

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We have measured high-field magnetization and magnetoresistance of polycrystalline samples of the A-site ordered perovskite CaCu 3 Ti 4−x Ru x O 12 (0 x 4) utilizing a nondestructive pulsed magnet. We find that the magnetization for x = 0.5, 1.0, and 1.5 is nonlinear, and tends to saturate in high fields. This is highly nontrivial because the magnetization for x = 0 and 4 is linear in external field up to the highest one. We have analyzed this field dependence based on the thermodynamics of magnetic materials, and propose that the external fields delocalize the holes on the Cu 2+ ions in order to maximize the entropy. This scenario is qualitatively consistent with a large magnetoresistance of −70% observed at 4.2 K at 52 T for x = 1.5.

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Non-Fermi-liquid behavior inCaCu3Ru4O12

Cited by 49 publications

References 58 publications

Correlation effects in CaCu3Ru4O12

Correlation effects in CaCu3Ru4O12

Magnetic and thermodynamic properties of the spin-dimer systemLa2RuO5induced by Mn substitution

High-field magnetization and magnetoresistance of theA-site ordered perovskite oxide CaCu3Ti4−x

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