| Autor: |
Hiroyuki Mitamura, Syuma Yasuzuka, Satoshi Tanda, T. Nakanishi, Nao Takeshita, Nobuo Môri, Yoshitoshi Okajima, Kazuhiko Yamaya |
| Rok vydání: |
2002 |
| Předmět: |
|
| Zdroj: |
Journal of Physics and Chemistry of Solids. 63:1003-1006 |
| ISSN: |
0022-3697 |
| DOI: |
10.1016/s0022-3697(02)00139-7 |
| Popis: |
We report the results of the resistance ( R ) and magnetoresistance (MR) measurements in NbSe 3 near the critical pressure ( P c ), where the lower charge-density-wave (CDW) phase is on the verge of destruction. Near P c , the temperature dependence of d R /d T exhibits a weak anomaly at T ∗ =15 K. MR gradually increases with decreasing temperature down to T ∗ , and then rises sharply below T ∗ . Comparing this sharp rise in MR with the large magnetoresistance (LMR) in the lower CDW phase reported previously, we find that there exists the lower CDW phase below T ∗ . However, MR does not follow Kohler's rule even at T T ∗ /2, where the temperature dependence of the CDW gap is very little. Moreover, detailed analysis of the temperature dependence of R and d R /d T show that the weak anomaly of d R /d T at T ∗ yields an excess conductance below T ∗ in spite of the formation of the CDW gap. The violation of Kohler's rule and the excess conductance below T ∗ are discussed in terms of the quantum fluctuation of the CDW phase near P c . |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect