报告了作者对Gd5Ge4合金样品进行了磁化和电输运测量的研究结果,实验表明,磁化强度随外磁场的增加而出现台阶式跳跃,磁转变的可逆性与温度存在有密切的关联. 在由磁场导致的磁转变附近电阻率随着磁场的增加亦表现出台阶式磁电阻现象,并在不同温区表现出正负不同的磁电阻效应,4.2 K时呈现正磁电阻效应,而在16和20 K时呈现出负磁阻效应,即铁磁相的阻值小于反铁磁相的阻值. 结果证明了在Gd5Ge4中存在的典型相分离特征,从而在磁场诱导下发生了反铁磁到铁磁的转变,并对这种奇异磁电阻效应的物理机制进行了讨论.
参考文献
| [1] | V K Pecharsky;K A Gschneidner Jr .[J].Physical Review Letters,1997,78:4494. |
| [2] | L. Morellon;J. Stankiewicz;B. García-Landa .Giant magnetoresistance near the magnetostructural transition in Gd↓(5)(Si↓(1.8)Ge↓(2.2))[J].Applied physics letters,1998(19/24):3462-3464. |
| [3] | L Morellon;P A Algarabel;M R Ibarra;J.Blasco,B.Garc a Landa,Z.Arnold,F.Albertini .[J].Physical Review,1998,B58:R14721. |
| [4] | J Stankiewicz;L Morellon;P A Algarabel;M.R.Ibarra .[J].Physical Review,2000,B61:12651. |
| [5] | Fe'lix Casanova;Xavier Batlle;Am lcar Labarta;Jordi Marcos,Llus Man osa,Antoni Planes .[J].Physical Review,2002,B66:212402. |
| [6] | E M Levin;V K Pecharsky;K A Gschneidner Jr;G.J.Miller .[J].Physical Review,2001,B64:235103. |
| [7] | L. H. Lewis;Ming-hui Yu;D. O. Welch;Richard J. Gambino .Manipulation of the metamagnetic transition and entropy change in Gd_(5)(Si,Ge)_(4)[J].Journal of Applied Physics,2004(11):6912-6914. |
| [8] | G. D. Samolyuk;V. P. Antropov .Electronic structure and magnetic properties of Gd_(5)(Si_(1-x)Ge_(x))_(4)[J].Journal of Applied Physics,2002(10):8540-8542. |
| [9] | J. Leib;J. E. Snyder;C. C. H. Lo;J. A. Paulsen;P. Xi;D. C. Jiles .Magnetic force microscopy characterization of a first-order transition: Magnetic-martensitic phase transformation in Gd_(5)(Si_(x)Ge_(1-x))_(4)[J].Journal of Applied Physics,2002(10):8852-8854. |
| [10] | A. O. Pecharsky;K. A. Gschneidner Jr.;V. K. Pecharsky .The room temperature metastable/stable phase relationships in the pseudo-binary Gd_5Si_4-Gd_5Ge_4 system[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2002(1/2):126-135. |
| [11] | J Stankiewicz;L Morellon;P A Algarabel;M.R.Ibarra .[J].Physical Review,2000,B61:12651. |
| [12] | W Choe;V K Pecharsky;A O Pecharsky;K.A.Gschneidner Jr.,V.G.Young Jr.,G.J.Miller .[J].Physical Review Letters,2000,84:4617. |
| [13] | E M Levin;K A Gschneidner Jr;V K Pecharsky .[J].Physical Review,2001,B65:214427. |
| [14] | V Hardy;S Majumdar;S J Crowe;M.R.Lees,D.McK.Paul,L.Herv,A.Maignan,S.H bert,C.Martin,C.Yaicle,M.Hervieu,and B.Raveau .[J].Physical Review,2004,B69:020407. |
| [15] | Guixin CAO;Jincang ZHANG;Shixun CAO;Chao JING,and Xuechu SHEN .[J].Applied Physics Letters,2005,86:042507. |
| [16] | V K Pecharsky;A P Holm;K A Gschneidner Jr;R.Rink .[J].Physical Review Letters,2003,91:197-204. |
| [17] | C Magen;Z Arnold;L Morellon;Y.Skorokhod.,P.A.Algarabel,M.R.Ibarra and J.Kamarad .[J].Physical Review Letters,2003,91:207202. |
| [18] | L Tan;J W Kim;A I Goldman;R.J.McQueeney,D.Wermeille,B.Sieve,T.A.Lograsso,D.L.Schlagel,S.L.Budko,V.K.Pecharsky and K.A.Gschneidner .[J].Physical Review,2005,B71:214408. |
| [19] | D Wohlleben;B Wittershagen .[J].Advances in Physics,1985,34:403. |
| [20] | E M Levin;V K Pecharsky;K A Gschneidner .[J].Physical Review,1999,B60:7993. |
| [21] | V K Pecharsky;K A Gschneidner .[J].Journal of Applied Physics,1999,85:5365. |
| [22] | E Srtyjewski;N Giordano .[J].Advances in Physics,1977,26:487. |
| [23] | 曹世勋,秦晓玲,李平林,曹桂新,张金仓,森克德,西村克彦.Er1-xDyxNi2B2C体系中超导和磁性的共存和相互作用[J].低温物理学报,2003(04):241-246. |
| [24] | 张玉凤,王新燕,津幡健,曹桂新,刘永生,敬超,西村克彦,森克德,曹世勋,张金仓.（La1-xYx）2/3Ca1/3MnO3（x=0～0.3）体系的磁特性与平均稀土离子尺寸效应的研究[J].低温物理学报,2004(01):1-7. |
| [25] | 王新燕,曹世勋,张玉风,津幡健,崔玉建,刘永生,曹桂新,西村克彦,森克德,敬超,张金仓.（La1-xCex）2/3Ca1/3MnO3体系的输运性质和反常磁特性研究[J].低温物理学报,2004(03):177-182. |
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