Electronic crossover in the normal state of YBa{sub 2}Cu{sub 4}O{sub 8}
- Physik-Institut, Universitaet Zuerich, CH-8057 Zuerich (Switzerland)
- Laboratorium fuer Festkoerperphysik, Eidgenoessische Technische Hochschule Zuerich, CH-8093 Zuerich (Switzerland)
By performing nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR), respectively, with Cu, O, and Y isotopes in the normal state of the high-temperature superconductor YBa{sub 2}Cu{sub 4}O{sub 8}, we have found the following major results: (i) The Y, Cu, and O shift data support, for planes and chains, the validity of the {open_quotes}single-spin fluid model.{close_quotes} (ii) Around T{sup {dagger}}=180 K, {open_quotes}anomalies{close_quotes} in the temperature behavior of several NMR/NQR quantities have been detected. (iii) The anomalies do not arise from a structural phase transition; instead they reflect an electronic crossover which involves enhanced charge fluctuations in planes and chains accompanied by a charge (hole) transfer from chain to plane. (iv) As a possible mechanism of the crossover, a charge-density-wave instability is proposed. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 538582
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cu nuclear magnetic resonance of aligned single crystals of YBa/sub 2/Cu/sub 3/O/sub 7/. sqrt. /sub delta/
Intrinsic magnetic centers and microdomains in oxygen-deficient YBa{sub 2}Cu{sub 3}O{sub 6.5} and TmBa{sub 2}Cu{sub 3}O{sub 6+x}