1
|
Santos-Cottin D, Mohelský I, Wyzula J, Le Mardelé F, Kapon I, Nasrallah S, Barišić N, Živković I, Soh JR, Guo F, Rigaux K, Puppin M, Dil JH, Gudac B, Rukelj Z, Novak M, Kuzmenko AB, Homes CC, Dietl T, Orlita M, Akrap A. EuCd_{2}As_{2}: A Magnetic Semiconductor. Phys Rev Lett 2023; 131:186704. [PMID: 37977632 DOI: 10.1103/physrevlett.131.186704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 05/22/2023] [Accepted: 10/10/2023] [Indexed: 11/19/2023]
Abstract
EuCd_{2}As_{2} is now widely accepted as a topological semimetal in which a Weyl phase is induced by an external magnetic field. We challenge this view through firm experimental evidence using a combination of electronic transport, optical spectroscopy, and excited-state photoemission spectroscopy. We show that the EuCd_{2}As_{2} is in fact a semiconductor with a gap of 0.77 eV. We show that the externally applied magnetic field has a profound impact on the electronic band structure of this system. This is manifested by a huge decrease of the observed band gap, as large as 125 meV at 2 T, and, consequently, by a giant redshift of the interband absorption edge. However, the semiconductor nature of the material remains preserved. EuCd_{2}As_{2} is therefore a magnetic semiconductor rather than a Dirac or Weyl semimetal, as suggested by ab initio computations carried out within the local spin-density approximation.
Collapse
Affiliation(s)
- D Santos-Cottin
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
| | - I Mohelský
- LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, F-38042 Grenoble, France
| | - J Wyzula
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, F-38042 Grenoble, France
| | - F Le Mardelé
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, F-38042 Grenoble, France
| | - I Kapon
- Department of Physics, University of Geneva, CH-1204 Geneva, Switzerland
| | - S Nasrallah
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria
| | - N Barišić
- Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
| | - I Živković
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - J R Soh
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - F Guo
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - K Rigaux
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - M Puppin
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - J H Dil
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - B Gudac
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
| | - Z Rukelj
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
| | - M Novak
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
| | - A B Kuzmenko
- Department of Physics, University of Geneva, CH-1204 Geneva, Switzerland
| | - C C Homes
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Tomasz Dietl
- International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
- WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - M Orlita
- LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, F-38042 Grenoble, France
- Institute of Physics, Charles University, CZ-12116 Prague, Czech Republic
| | - Ana Akrap
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
| |
Collapse
|
2
|
Klebel-Knobloch B, Tabiś W, Gala MA, Barišić OS, Sunko DK, Barišić N. Transport properties and doping evolution of the Fermi surface in cuprates. Sci Rep 2023; 13:13562. [PMID: 37604843 PMCID: PMC10442347 DOI: 10.1038/s41598-023-39813-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 07/31/2023] [Indexed: 08/23/2023] Open
Abstract
Measured transport properties of three representative cuprates are reproduced within the paradigm of two electron subsystems, itinerant and localized. The localized subsystem evolves continuously from the Cu 3d[Formula: see text] hole at half-filling and corresponds to the (pseudo)gapped parts of the Fermi surface. The itinerant subsystem is observed as a pure Fermi liquid (FL) with material-independent universal mobility across the doping/temperature phase diagram. The localized subsystem affects the itinerant one in our transport calculations solely by truncating the textbook FL integrals to the observed (doping- and temperature-dependent) Fermi arcs. With this extremely simple picture, we obtain the measured evolution of the resistivity and Hall coefficients in all three cases considered, including LSCO which undergoes a Lifshitz transition in the relevant doping range, a complication which turns out to be superficial. Our results imply that prior to evoking polaronic, quantum critical point, quantum dissipation, or even more exotic scenarios for the evolution of transport properties in cuprates, Fermi-surface properties must be addressed in realistic detail.
Collapse
Affiliation(s)
| | - W Tabiś
- Institute of Solid State Physics, TU Wien, 1040, Vienna, Austria
- Faculty of Physics and Applied Computer Science, AGH University of Krakow, 30-059, Krakow, Poland
| | - M A Gala
- Institute of Solid State Physics, TU Wien, 1040, Vienna, Austria
- Faculty of Physics and Applied Computer Science, AGH University of Krakow, 30-059, Krakow, Poland
| | - O S Barišić
- Institute of Physics, Bijenička cesta 46, HR-10000, Zagreb, Croatia.
| | - D K Sunko
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000, Zagreb, Croatia.
| | - N Barišić
- Institute of Solid State Physics, TU Wien, 1040, Vienna, Austria.
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000, Zagreb, Croatia.
| |
Collapse
|
3
|
Abstract
A review of the phenomenology and microscopy of cuprate superconductors is presented, with particular attention to universal conductance features, which reveal the existence of two electronic subsystems. The overall electronic system consists of 1 + p charges, where p is the doping. At low dopings, exactly one hole is localized per planar copper-oxygen unit, while upon increasing doping and temperature, the hole is gradually delocalized and becomes itinerant. Remarkably, the itinerant holes exhibit identical Fermi liquid character across the cuprate phase diagram. This universality enables a simple count of carrier density and yields comprehensive understanding of the key features in the normal and superconducting state. A possible superconducting mechanism is presented, compatible with the key experimental facts. The base of this mechanism is the interaction of fast Fermi liquid carriers with localized holes. A change in the microscopic nature of chemical bonding in the copper oxide planes, from ionic to covalent, is invoked to explain the phase diagram of these fascinating compounds.
Collapse
Affiliation(s)
- N. Barišić
- Department of Physics, Faculty of Science, University of Zagreb, Zagreb, 10000 Croatia
- Institute of Solid State Physics, TU Wien, Vienna, 1040 Austria
| | - D. K. Sunko
- Department of Physics, Faculty of Science, University of Zagreb, Zagreb, 10000 Croatia
| |
Collapse
|
4
|
Bedenić B, Ladavac R, Vranić-Ladavac M, Barišić N, Karčić N, Sreter KB, Mihaljević S, Bielen L, Car H, Beader N. FALSE POSITIVE PHENOTYPIC DETECTION OF METALLO-BETA-LACTAMASES IN ACINETOBACTER BAUMANNII. Acta Clin Croat 2019; 58:113-118. [PMID: 31363333 PMCID: PMC6629212 DOI: 10.20471/acc.2019.58.01.15] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Phenotypic detection of metallo-β-lactamases (MBLs) in Acinetobacter (A.) baumannii is a serious challenge to clinical microbiologists. MBLs are inhibited by metal chelators such as ethylenediaminetetraacetic acid) (EDTA). Production of MBLs cannot be recognized based on resistance phenotype. Therefore, phenotypic tests using EDTA are recommended. The aim of this study was to investigate the sensitivity and specificity of inhibitor based tests (EDTA) for detection of MBL. A total of 172 A. baumannii strains (123 carbapenemase positive and 49 carbapenemase negative) were analyzed. Phenotypic detection of MBLs was performed by the combined disk test with EDTA (CDT-EDTA) and EPI-dilution test (EPI-DT). Both tests were positive in all 11 isolates possessing VIM-1 MBL, showing 100% sensitivity. However, false positive results were observed in strains with class D carbapenemases using both tests, i.e. all OXA-23 and OXA-24/40 producing organisms and most OXA-58 positive strains (77% with CDT-EDTA vs. 65% with EPI-DT). False positive results can occur because oxacillinases are converted to a less active state in the presence of EDTA, leading to augmentation of the inhibition zone around the carbapenem disk or reduction of carbapenem minimum inhibitory concentrations. This study showed high sensitivity but low specificity of phenotypic methods in the detection of MBLs.
Collapse
Affiliation(s)
| | - Ranko Ladavac
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| | - Mirna Vranić-Ladavac
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| | - Nada Barišić
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| | - Natalie Karčić
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| | - Katherina Bernadette Sreter
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| | - Slobodan Mihaljević
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| | - Luka Bielen
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| | - Haris Car
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| | - Nataša Beader
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Nephrology, Pula General Hospital, Pula, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 6Department of Anesthesiology, Zagreb University Hospital Centre, Zagreb, Croatia; 7Department of Internal Medicine, Zagreb University Hospital Centre, Zagreb, Croatia; 8Zagreb Secondary Medical School, Zagreb, Croatia
| |
Collapse
|
5
|
Li Y, Tabis W, Tang Y, Yu G, Jaroszynski J, Barišić N, Greven M. Hole pocket-driven superconductivity and its universal features in the electron-doped cuprates. Sci Adv 2019; 5:eaap7349. [PMID: 30746483 PMCID: PMC6358316 DOI: 10.1126/sciadv.aap7349] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 10/02/2018] [Indexed: 05/10/2023]
Abstract
After three decades of intensive research attention, the emergence of superconductivity in cuprates remains an unsolved puzzle. One major challenge has been to arrive at a satisfactory understanding of the unusual metallic "normal state" from which the superconducting state emerges upon cooling. A second challenge has been to achieve a unified understanding of hole- and electron-doped compounds. Here, we report detailed magnetoresistance measurements for the archetypal electron-doped cuprate Nd2-x Ce x CuO4+δ that, in combination with previous data, provide crucial links between the normal and superconducting states and between the electron- and hole-doped parts of the phase diagram. The characteristics of the normal state (magnetoresistance, quantum oscillations, and Hall coefficient) and those of the superconducting state (superfluid density and upper critical field) consistently indicate two-band (electron and hole) features and point to hole pocket-driven superconductivity in these nominally electron-doped materials. We show that the approximate Uemura scaling between the superconducting transition temperature and the superfluid density found for hole-doped cuprates also holds for the small hole component of the superfluid density in electron-doped cuprates.
Collapse
Affiliation(s)
- Yangmu Li
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
- Corresponding author. (Y.L.); (N.B.); (M.G.)
| | - W. Tabis
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
- AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, 30-059 Krakow, Poland
| | - Y. Tang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
| | - G. Yu
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
| | - J. Jaroszynski
- National High Magnetic Field National Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA
| | - N. Barišić
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
- Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
- Department of Physics, Faculty of Science, University of Zagreb, HR-10000 Zagreb, Croatia
- Corresponding author. (Y.L.); (N.B.); (M.G.)
| | - M. Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
- Corresponding author. (Y.L.); (N.B.); (M.G.)
| |
Collapse
|
6
|
Pelc D, Popčević P, Požek M, Greven M, Barišić N. Unusual behavior of cuprates explained by heterogeneous charge localization. Sci Adv 2019; 5:eaau4538. [PMID: 30746450 PMCID: PMC6357730 DOI: 10.1126/sciadv.aau4538] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 12/07/2018] [Indexed: 06/09/2023]
Abstract
The discovery of high-temperature superconductivity in cuprates ranks among the major scientific milestones of the past half century, yet pivotal questions regarding the complex phase diagram of these materials remain unanswered. Generally thought of as doped charge-transfer insulators, these complex oxides exhibit pseudogap, strange-metal, superconducting, and Fermi liquid behavior with increasing hole-dopant concentration. Motivated by recent experimental observations, here we introduce a phenomenological model wherein exactly one hole per planar copper-oxygen unit is delocalized with increasing doping and temperature. The model is percolative in nature, with parameters that are highly consistent with experiments. It comprehensively captures key unconventional experimental results, including the temperature and the doping dependence of the pseudogap phenomenon, the strange-metal linear temperature dependence of the planar resistivity, and the doping dependence of the superfluid density. The success and simplicity of the model greatly demystify the cuprate phase diagram and point to a local superconducting pairing mechanism.
Collapse
Affiliation(s)
- D. Pelc
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000 Zagreb, Croatia
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
| | - P. Popčević
- Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
- Institute of Physics, HR-10000 Zagreb, Croatia
| | - M. Požek
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000 Zagreb, Croatia
| | - M. Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
| | - N. Barišić
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000 Zagreb, Croatia
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
- Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
| |
Collapse
|
7
|
Bedenić B, Cavrić G, Vranić-Ladavac M, Barišić N, Karčić N, Tot T, Presečki-Stanko A, Lukić-Grlić A, Frančula-Zaninović S, Sreter KB. COMPARISON OF TWO DIFFERENT METHODS FOR TIGECYCLINE SUSCEPTIBILITY TESTING IN ACINETOBACTER BAUMANNII. Acta Clin Croat 2018; 57:618-623. [PMID: 31168197 PMCID: PMC6544113 DOI: 10.20471/acc.2018.57.04.02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
SUMMARY – Tigecycline susceptibility testing (TST) presents a tremendous challenge for clinical microbiologists. Previous studies have shown that the Epsilometer test (E-test) and Vitek 2 automated system significantly overestimate the minimum inhibitory concentrations for tigecycline resistance compared to the broth microdilution method (BMM). This leads to very major errors or false susceptibility (i.e. the isolate is called susceptible when it is actually resistant). The aim of this study was to compare E-test against BMM for TST in carbapenem-resistant and carbapenem-susceptible Acinetobacter (A.) baumannii and to analyze changes in tigecycline susceptibility between two time periods (2009-2012 and 2013-2014), with BMM as the gold standard. Using the EUCAST criteria, the rate of resistance to tigecycline for the OXA-23 MBL-positive, OXA-23 MBL-negative and carbapenemase-negative strains for BMM was 54.5% (6/11), 29.4% (5/17) and 2.7% (1/37), respectively; the OXA-24/40 and OXA-58 producing organisms did not exhibit any resistance. With E-test, all OXA-23 MBL-positive organisms (11/11), 23.5% (4/17) of OXA-23 MBL-negative, and 4.1% of OXA-24/40 (3/74) strains displayed tigecycline resistance; there were no resistant strains among the OXA-58 and carbapenemase-negative isolates. Resistance emerged in the bacterial isolates from 2013 to 2014. Although tigecycline does not display cross-resistance, the highest rates of resistant A. baumannii isolates were observed among those producing VIM MBL, regardless of the testing method. These findings suggest that the commercial E-test does not provide reliable results for TST of A. baumannii. Further confirmation with the dilution method should be recommended, particularly in cases of serious infections.
Collapse
Affiliation(s)
- Branka Bedenić
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Gordana Cavrić
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Mirna Vranić-Ladavac
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Nada Barišić
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Natalie Karčić
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Tatjana Tot
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Aleksandra Presečki-Stanko
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Amarela Lukić-Grlić
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Sonja Frančula-Zaninović
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| | - Katherina Bernadette Sreter
- 1Department of Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; 2Department of Clinical and Molecular Microbiology, Zagreb University Hospital Centre, Zagreb, Croatia; 3Department of Intensive Care, Merkur University Hospital, Zagreb, Croatia; 4Department of Microbiology, Public Health Institute of Istria County, Pula, Croatia; 5Department of Microbiology, Karlovac General Hospital, Karlovac, Croatia; 6Department of Clinical Microbiology, Zagreb Children's Hospital, Zagreb, Croatia; 7Zagreb Health Centre, Zagreb, Croatia; 8Department of Clinical Immunology, Pulmonology and Rheumatology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia
| |
Collapse
|
8
|
Bedenić B, Vranić-Ladavac M, Venditti C, Tambić-Andrašević A, Barišić N, Gužvinec M, Karčić N, Petrosillo N, Ladavac R, di Caro A. Emergence of colistin resistance in Enterobacter aerogenes from Croatia. J Chemother 2017; 30:120-123. [PMID: 29063811 DOI: 10.1080/1120009x.2017.1382121] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A colistin-resistant Enterobacter aerogenes [study code 12264] was isolated from the tracheal aspirate of a 71-year-old male patient in the General Hospital [GH] in Pula, Croatia. The patient was previously treated in University Hospital Centre in Rijeka with colistin in order to eradicate Acinetobacter baumannii isolate, susceptible only to colistin and tigecycline. Genes encoding ESBLs [blaTEM, blaSHV, blaCTX-M, blaPER-1] were screened by PCR. The strain was shown to possess blaCTX-M-15 and blaTEM-1 genes. To asses genes possibly involved in resistance to colistin the chromosomal enconding mgrB gene and the plasmid-mediated mcr-1 and mcr-2 genes were screened as described previously. Mcr-1 and mcr-2 genes were not detected and mgrB gene presented a wild-type sequence. PCR-based Replicon typing method [PBRT] conducted on an E. aerogenes isolate, showed that the strain carried an IncN plasmid. Adaptive mechanisms such as changes of the bacterial cell outer membrane that cause porin decrease or presence of an efflux pump, due to selection pressure exerted by the therapeutic administration of colistin, could be responsible for the development of colistin resistance in our strain, as recently reported in E. aerogenes from France. Due to effective infection control measures, the colistin-resistant strain did not spread to other patients or hospital wards. This is the first report of an ESBL-producing, colistin-resistant E. aerogenes in clinically relevant samples such as endotracheal aspirate and blood culture, showing the presence of this rare resistance profile among Gram-negative bacteria.
Collapse
Affiliation(s)
- Branka Bedenić
- a Department of Microbiology, School of Medicine , University of Zagreb , Zagreb , Croatia.,b Clinical Department of Clinical and Molecular Microbiology , University Hospital Center Zagreb , Zagreb , Croatia
| | | | - Carolina Venditti
- d National Institute for Infectious Diseases, Spallanzani , Rome , Italy
| | | | - Nada Barišić
- c Public Health Institute of Istria County , Pula , Croatia
| | - Marija Gužvinec
- e University Hospital for Infectious Diseases , Zagreb , Croatia
| | - Natalie Karčić
- c Public Health Institute of Istria County , Pula , Croatia
| | - Nicola Petrosillo
- d National Institute for Infectious Diseases, Spallanzani , Rome , Italy
| | | | - Antonino di Caro
- d National Institute for Infectious Diseases, Spallanzani , Rome , Italy
| |
Collapse
|
9
|
Ladavac R, Bedenić B, Vranić-Ladavac M, Barišić N, Karčić N, Pompe K, Ferenčić A, Stojanović A, Seifert H, Katić S, Higgins PG. Emergence of different Acinetobacter baumannii clones in a Croatian hospital and correlation with antibiotic susceptibility. J Glob Antimicrob Resist 2017; 10:213-218. [PMID: 28735048 DOI: 10.1016/j.jgar.2017.07.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 06/07/2017] [Accepted: 07/09/2017] [Indexed: 10/19/2022] Open
Abstract
OBJECTIVES During routine diagnostic laboratory work, the clinical microbiologist observed an increase of Acinetobacter baumannii isolates with three different carbapenem susceptibility patterns: susceptible, intermediate and resistant. Isolates belonging to the same carbapenem susceptibility phenotype exhibited identical susceptibility/resistance patterns to non-β-lactam antibiotics. This prompted us to analyse the mechanisms of carbapenem-resistance and the molecular epidemiology of the isolates. A total of 59 A. baumannii isolates were analysed and grouped according to their susceptibility to imipenem: group 1 were susceptible (N=24), group 2 were intermediate (N=8) and group 3 were resistant (N=27) to imipenem. MATERIAL AND METHODS PCR and sequencing was used to detect resistance genes. Genotyping of the isolates was performed by PFGE and MLST. RESULTS Out of 27 resistant isolates, 20 harboured blaOXA-40-like and 7 blaOXA-23-like genes. ISAba1 was found upstream of blaOXA-51 and blaOXA-23 genes. PFGE genotyping demonstrated the existence of three major A. baumannii clones in GH Pula and determination of sequence groups showed that the isolates belonged to international clones commonly associated with multidrug-resistance. MLST (performed on six isolates) showed diverse population structure of isolates belonging to the same cluster, including ST 195, ST 231, ST 775 and ST 1095. CONCLUSIONS A previous study conducted in 2009-2010 showed that reduced susceptibility to carbapenems in GH Pula was only associated with upregulation of the intrinsic OXA-51 β-lactamase. In this study a shift to isolates with acquired oxacillinases, belonging to two major clones was reported.
Collapse
Affiliation(s)
- Ranko Ladavac
- Department for Nephrology, General Hospital Pula, Pula, Croatia
| | - Branka Bedenić
- Department for Microbiology, School of Medicine, University of Zagreb, Zagreb, Croatia; Clinical Department for Clinical and Molecular Microbiology, University Hospital Center Zagreb, Zagreb, Croatia.
| | - Mirna Vranić-Ladavac
- Department for Microbiology, Public Health Institute of Istria County, Pula, Croatia
| | - Nada Barišić
- Department for Microbiology, Public Health Institute of Istria County, Pula, Croatia
| | - Natalie Karčić
- Department for Microbiology, Public Health Institute of Istria County, Pula, Croatia
| | - Karoline Pompe
- Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Goldenfelsstrasse 19-21, Cologne, Germany
| | - Antun Ferenčić
- School of Medicin, University of Rijeka, Rijeka, Croatia
| | - Aleksandar Stojanović
- Department for Microbiology, Public Health Institute of Istria County, Pula, Croatia
| | - Harald Seifert
- Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Goldenfelsstrasse 19-21, Cologne, Germany; German Centre for Infection Research (DZIF), Partner Site Bonn-Cologne, Cologne, Germany
| | - Stjepan Katić
- Clinical Department for Clinical and Molecular Microbiology, University Hospital Center Zagreb, Zagreb, Croatia
| | - Paul G Higgins
- Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Goldenfelsstrasse 19-21, Cologne, Germany; German Centre for Infection Research (DZIF), Partner Site Bonn-Cologne, Cologne, Germany
| |
Collapse
|
10
|
Li Y, Tabis W, Yu G, Barišić N, Greven M. Hidden Fermi-liquid Charge Transport in the Antiferromagnetic Phase of the Electron-Doped Cuprate Superconductors. Phys Rev Lett 2016; 117:197001. [PMID: 27858438 DOI: 10.1103/physrevlett.117.197001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Indexed: 06/06/2023]
Abstract
Systematic analysis of the planar resistivity, Hall effect, and cotangent of the Hall angle for the electron-doped cuprates reveals underlying Fermi-liquid behavior even deep in the antiferromagnetic part of the phase diagram. The transport scattering rate exhibits a quadratic temperature dependence, and is nearly independent of doping and compound and carrier type (electrons versus holes), and hence is universal. Our analysis moreover indicates that the material-specific resistivity upturn at low temperatures and low doping has the same origin in both electron- and hole-doped cuprates.
Collapse
Affiliation(s)
- Yangmu Li
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - W Tabis
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
- AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, 30-059 Krakow, Poland
| | - G Yu
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - N Barišić
- Fakultät für Physik, Technische Universität Wien, Wiedner Hauptstraße 8, 1040 Wien, Austria
- Department of Physics, Faculty of Science, University of Zagreb, HR-10000 Zagreb, Croatia
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| |
Collapse
|
11
|
Krajčinović SS, Doronjski A, Barišić N, Stojanović V. Risk Factors for Neonatal Sepsis and Method for Reduction of Blood Culture Contamination. Malawi Med J 2015; 27:20-4. [PMID: 26137194 DOI: 10.4314/mmj.v27i1.6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND False-positive blood cultures findings may lead to a falsely increased morbidity and increased hospital costs. METHOD The survey was conducted as retrospective - prospective study and included 239 preterm infants (born before 37 weeks of gestation) who were treated in Neonatal Intensive Care Unit (NICU) in Institute for Child and Youth Health Care of Vojvodina during one year (January 1st, 2012 to December 31st, 2012). The retrospective part of the study focused on examination of incidence of neonatal sepsis and determination of risk factors. In the prospective part of the study infants were sub-divided into two groups: Group 1- infants hospitalized in NICU during the first 6 months of the study; blood cultures were taken by the "clean technique" and checklists for this procedure were not taken. Group 2- neonates hospitalized in NICU during last 6 months of the study; blood cultures were taken by "sterile technique" and checklists for this procedure were taken. RESULTS The main risk factors for sepsis were prelabor rupture of membranes, low gestational age, low birth weight, mechanical ventilation, umbilical venous catheter placement, and abdominal drainage. Staphylococcus aureus and coagulase negative Staphylococcus were the most frequently isolated microorganisms in false-positive blood samples. CONCLUSIONS Education of employees, use of checklists and sterile sets for blood sampling, permanent control of false positive blood cultures, as well as regular and routine monthly reports are crucial for successful reduction of contamination rates.
Collapse
Affiliation(s)
- S S Krajčinović
- Intensive Care Unit, Institute for Child and Youth Health care of Vojvodina, Hajduk Veljkova 10, 21000 Novi Sad, Serbia
| | - A Doronjski
- Intensive Care Unit, Institute for Child and Youth Health care of Vojvodina, Hajduk Veljkova 10, 21000 Novi Sad, Serbia ; Medical faculty, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia
| | - N Barišić
- Intensive Care Unit, Institute for Child and Youth Health care of Vojvodina, Hajduk Veljkova 10, 21000 Novi Sad, Serbia ; Medical faculty, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia
| | - V Stojanović
- Intensive Care Unit, Institute for Child and Youth Health care of Vojvodina, Hajduk Veljkova 10, 21000 Novi Sad, Serbia ; Medical faculty, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia
| |
Collapse
|
12
|
Tabis W, Li Y, Le Tacon M, Braicovich L, Kreyssig A, Minola M, Dellea G, Weschke E, Veit MJ, Ramazanoglu M, Goldman AI, Schmitt T, Ghiringhelli G, Barišić N, Chan MK, Dorow CJ, Yu G, Zhao X, Keimer B, Greven M. Charge order and its connection with Fermi-liquid charge transport in a pristine high-T(c) cuprate. Nat Commun 2014; 5:5875. [PMID: 25522689 DOI: 10.1038/ncomms6875] [Citation(s) in RCA: 236] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 11/17/2014] [Indexed: 11/09/2022] Open
Abstract
Electronic inhomogeneity appears to be an inherent characteristic of the enigmatic cuprate superconductors. Here we report the observation of charge-density-wave correlations in the model cuprate superconductor HgBa2CuO(4+δ) (T(c)=72 K) via bulk Cu L3-edge-resonant X-ray scattering. At the measured hole-doping level, both the short-range charge modulations and Fermi-liquid transport appear below the same temperature of about 200 K. Our result points to a unifying picture in which these two phenomena are preceded at the higher pseudogap temperature by q=0 magnetic order and the build-up of significant dynamic antiferromagnetic correlations. The magnitude of the charge modulation wave vector is consistent with the size of the electron pocket implied by quantum oscillation and Hall effect measurements for HgBa2CuO(4+δ) and with corresponding results for YBa2Cu3O(6+δ), which indicates that charge-density-wave correlations are universally responsible for the low-temperature quantum oscillation phenomenon.
Collapse
Affiliation(s)
- W Tabis
- 1] School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA [2] AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Y Li
- 1] International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
| | - M Le Tacon
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
| | - L Braicovich
- CNR-SPIN, CNISM and Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - A Kreyssig
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - M Minola
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
| | - G Dellea
- CNR-SPIN, CNISM and Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - E Weschke
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - M J Veit
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - M Ramazanoglu
- 1] Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA [2] Physics Engineering Department, ITU, Maslak 34469, Istanbul, Turkey
| | - A I Goldman
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - T Schmitt
- Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - G Ghiringhelli
- CNR-SPIN, CNISM and Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - N Barišić
- 1] School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA [2] Service de Physique de l'Etat Condensé, CEA-DSM-IRAMIS, F-91198 Gif-sur-Yvette, France [3] Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - M K Chan
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - C J Dorow
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - G Yu
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - X Zhao
- 1] School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA [2] State Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
| | - B Keimer
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| |
Collapse
|
13
|
Chan MK, Veit MJ, Dorow CJ, Ge Y, Li Y, Tabis W, Tang Y, Zhao X, Barišić N, Greven M. In-plane magnetoresistance obeys Kohler's rule in the pseudogap phase of cuprate superconductors. Phys Rev Lett 2014; 113:177005. [PMID: 25379934 DOI: 10.1103/physrevlett.113.177005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Indexed: 06/04/2023]
Abstract
We report in-plane resistivity (ρ) and transverse magnetoresistance (MR) measurements for underdoped HgBa(2)CuO(4+δ) (Hg1201). Contrary to the long-standing view that Kohler's rule is strongly violated in underdoped cuprates, we find that it is in fact satisfied in the pseudogap phase of Hg1201. The transverse MR shows a quadratic field dependence, δρ/ρ(0)=aH(2), with a(T)∝T(-4). In combination with the observed ρ∝T(2) dependence, this is consistent with a single Fermi-liquid quasiparticle scattering rate. We show that this behavior is typically masked in cuprates with lower structural symmetry or strong disorder effects.
Collapse
Affiliation(s)
- M K Chan
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - M J Veit
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - C J Dorow
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Y Ge
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Y Li
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - W Tabis
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. A. Mickiewicza 30, 30-059 Krakow, Poland
| | - Y Tang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - X Zhao
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and State Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
| | - N Barišić
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and Service de Physique de l'Etat Condensé, CEA-DSM-IRAMIS, F 91198 Gif-sur-Yvette, France and Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| |
Collapse
|
14
|
Li Y, Le Tacon M, Matiks Y, Boris AV, Loew T, Lin CT, Chen L, Chan MK, Dorow C, Ji L, Barišić N, Zhao X, Greven M, Keimer B. Doping-dependent photon scattering resonance in the model high-temperature superconductor HgBa2CuO4+δ revealed by Raman scattering and optical ellipsometry. Phys Rev Lett 2013; 111:187001. [PMID: 24237551 DOI: 10.1103/physrevlett.111.187001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Indexed: 06/02/2023]
Abstract
We study the model high-temperature superconductor HgBa(2)CuO(4+δ) with electronic Raman scattering and optical ellipsometry over a wide doping range. The dependence of the resonant Raman cross section on the incident photon energy changes drastically as a function of doping, in a manner that corresponds to a rearrangement of the interband optical transitions seen with ellipsometry. This doping-dependent Raman resonance allows us to reconcile the apparent discrepancy between Raman and x-ray detection of magnetic fluctuations in superconducting cuprates. Intriguingly, the strongest variation occurs across the doping level where the antinodal superconducting gap appears to reach its maximum.
Collapse
Affiliation(s)
- Yuan Li
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China and Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Li Y, Le Tacon M, Bakr M, Terrade D, Manske D, Hackl R, Ji L, Chan MK, Barišić N, Zhao X, Greven M, Keimer B. Feedback effect on high-energy magnetic fluctuations in the model high-temperature superconductor HgBa2CuO(4+δ) observed by electronic Raman scattering. Phys Rev Lett 2012; 108:227003. [PMID: 23003643 DOI: 10.1103/physrevlett.108.227003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Indexed: 06/01/2023]
Abstract
We use electronic Raman scattering to study the model single-layer cuprate superconductor HgBa(2)CuO(4+δ). In an overdoped sample, we observe a pronounced amplitude enhancement of a high-energy peak related to two-magnon excitations in insulating cuprates upon cooling below the critical temperature T(c). This effect is accompanied by the appearance of the superconducting gap and a pairing peak above the gap in the Raman spectrum, and it can be understood as a hitherto-undetected feedback effect on the high-energy magnetic fluctuations due to the Cooper pairing interaction. This implies a direct involvement of the high-energy magnetic fluctuations in the pairing mechanism. All of these effects occur already above T(c) in two underdoped samples, demonstrating a related feedback mechanism associated with the pseudogap.
Collapse
Affiliation(s)
- Yuan Li
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Li Y, Balédent V, Yu G, Barišić N, Hradil K, Mole RA, Sidis Y, Steffens P, Zhao X, Bourges P, Greven M. Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor. Nature 2010; 468:283-5. [DOI: 10.1038/nature09477] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Accepted: 09/07/2010] [Indexed: 01/10/2023]
|
17
|
Hardy F, Hillier NJ, Meingast C, Colson D, Li Y, Barišić N, Yu G, Zhao X, Greven M, Schilling JS. Enhancement of the critical temperature of HgBa₂CuO(4+δ) by applying uniaxial and hydrostatic pressure: implications for a universal trend in cuprate superconductors. Phys Rev Lett 2010; 105:167002. [PMID: 21230997 DOI: 10.1103/physrevlett.105.167002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Indexed: 05/30/2023]
Abstract
It is well known that the superconducting transition temperature (T(c)) of cuprate superconductors can be enhanced by varying certain structural and electronic parameters, such as the flatness of the CuO₂ planes or their doping level. We determine the uniaxial and hydrostatic pressure derivatives of T(c) in the structurally simple tetragonal compound HgBa₂CuO(4+δ) near optimal doping. Our results provide experimental evidence for two further methods to enhance T(c): (i) reducing the area of the CuO₂ planes, and (ii) increasing the separation of the CuO₂ planar groups. T(c) is found to couple much more strongly to the ratio c/a of the lattice constants than to the unit cell volume. A comparison with prior results for structurally more complicated cuprates reveals a general trend of uniaxial pressure derivatives with T(c).
Collapse
Affiliation(s)
- F Hardy
- Institute for Solid State Physics, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
|