Training effect by the applied magnetic field in the double-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Pr</mml:mi><mml:mrow><mml:mn>0.5</mml:mn><mml:mo>+</mml:mo><mml:mn>0.5</mml:mn><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mrow><mml:mn>0.5</mml:mn><mml:mo>−</mml:mo><mml:mn>0.5</mml:mn><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mm

Pi, Li; Cai, Jianwei; Zhang, Quan; Tan, Shun; Zhang, Yuheng

doi:10.1103/physrevb.71.134418

Cited by 29 publications

(17 citation statements)

References 18 publications

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“…Hence, we conclude that the increase of f AFII deduces the decreasing H c . The antiferromagnetic exchange interaction of AFII is much larger than that of COOAF [18]. The decrease of f AFII deduces the softening of the antiferromagnetic exchange interaction, which would increase the polarization of the CO regions and reduce the Zeeman energy advantage of the ferromagnetic state to which the system is transforming [11].…”

Section: Resultsmentioning

confidence: 95%

“…As for the samples with x ≥ 0.10, AFII instead of COOAF predominates in AFM phase. AFII is more stable than COOAF [18], cannot be converted to FM state voluminously under the field investigated. The relative magnitude of the step can be written as g = M/M th reduces with the increasing Fe doping (g = 0.905, 0.772 and 0.380 for x = 0, 0.02 and 0.05, respectively), which suggests that the fraction of COOAF (f COOAF ) decreases with increasing Fe doping.…”

Section: Resultsmentioning

confidence: 96%

See 1 more Smart Citation

Metamagnetic phase transitions in perovskite manganites

Li¹,

Miao²,

Sui³

et al. 2008

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 96%

Metamagnetic phase transitions in perovskite manganites

Li¹,

Miao²,

Sui³

et al. 2008

Journal of Alloys and Compounds

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“…A particular fi nding is that, as the magnetic fi eld sweeps from zero to ±60 kOe, there fi rst emerges a large positive magnetoresistance (PMR), and then turns to the classical negative CMR driven by the wileyonlinelibrary.com AFM-COO melting at H cr ≈35 kOe. Although a training effect is seen with the magnetization jump magnitude, [ 33 ] the critical fi elds for the low fi eld PMR, the low fi eld magnetization shoulder (see also Figure 4 c), and the high fi eld AFM-COO melting are only slightly infl uenced. To gain more insights on the nontrivial PMR, we measured the low fi eld magnetoresistive behavior with current perpendicular to magnetic fi eld ( H ⊥ I ) (Figure 4 e).…”

Section: Resultsmentioning

confidence: 89%

Spin Nematicity and Large Low‐Field Positive Magnetoresistance in a Half‐Doped Manganite: An Approach Exploiting Cation Size Disorder

Wang

et al. 2015

Adv Elect Materials

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ELC states should arise from strong electron correlations. However, a clear picture is still far from completed, especially for transition metal oxides where the interplay between spin, charge and orbital degrees of freedom is ineluctably complex. On the other hand, how essentially the ELC states would grant exotic physical properties remains to be elucidated in spite of relentless efforts.In general ELC states are expected to stay away from even a weak material disorder. [ 2,21 ] In this work, we however report an exploring of spin nematic phase in perovskite manganites (La 1-x Y x ) 0.5 (Ca 1-y Sr y ) 0.5 MnO 3 (LYCS) by increasing cation size disorder ( σ 2 ), quantifi ed by q r rwhere q i is the fractional occupancies of A-site species in the ABO 3 type structure, r i and r A are the individual and mean ionic radius, respectively. [ 22,23 ] The parent oxide La 0.5 Ca 0.5 MnO 3 is a prototypical half-doped manganite and is well known for its antiferromagnetic (AFM) charge-exchange (CE) type charge-orbital ordering (COO). [ 24,25 ] Recently, a real-space imaging study of this compound by Tao et al. reveals a nanoscale phase separation, presenting as randomly distributed charge disordering (CD) droplets in the AFM-COO matrix. [ 11 ] It is therefore of keen interest to see if the CD droplets could be elongated and textured, and with possible enhanced spin moments driven by magnetic symmetry breaking. Note that there exist the following relations for the cation ionic size: r r [ 23 ] A cation size mismatch and disorder already presents at x = y = 0 ( σ 2 = 0.0003 Å 2 ). By tuning the (Y,Sr) ratios at the A site in LYCS, one can fi x r A and the hole doping while increase the cation size disorder, [ 26 ] which would further break the AFM-COO symmetry and thus create an expanded CD phase in ELC states. Here, with detailed magnetic and electrical measurements, we demonstrate that a spin nematic phase can be indeed separated from the weakened AFM-COO matrix by a minor σ 2 = 0.001 Å 2 , and remarkably, such an ELC state can yield large positive as well as negative magnetoresistance under external magnetic fi elds much lower than that required for the conventional colossal magnetoresistance (CMR).In principle, material disorder such as random dopants disfavors the long range electronic liquid crystal (ELC) order in quantum matters. It is reported that a minor A site cation size disorder ( σ 2 = 0.001 Å 2 ) in half-doped manganites (La 1-x Y x ) 0.5 (Ca 1-y Sr y ) 0.5 MnO 3 interestingly leads to spin nematicity which is accompanied by a large positive magnetoresistance (up to 40%) at fi elds ( H ≤ 1 kOe at 60 K) much lower than that ( H cr ≈ 35 kOe) critical for melting the weakened antiferromagnetic charge-orbital ordering (AFM-COO). The spin nematicity, emerging with a suppressed orthorhombicity, is ascribed to the destabilization of the d 3 x 2 -r 2 / d 3 y 2 -r 2 orbital stripe alternation and the consequent magnetic symmetry breaking. The non-trivial low fi eld magnetoresistance is found to be determined by the spi...

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“…The authors concluded from the magnetic and magneto-transport properties that the anomalous behavior observed in the above-mentioned manganite compounds originates from the magnetic training effect due to the field cycling. On the other hand, Pi et al reported that the training effect is a common phenomenon of phase separated compounds [13]. Since our nanocomposite compound is phase separated, a signature of the training effect is expected to be present.…”

Section: Resultsmentioning

confidence: 97%

“…The formation of the connected ferromagnetic metallic percolation path in the phase separated manganites results in the decrease of resistance. The occurrence of magnetic training effect is frequently observed in cases of mixed valent phase-separated manganites [13]. The consequence of the training effect is the growth of the antiferromagnetic phase fraction owing to either temperature or magnetic field cycling.…”

Section: Introductionmentioning

confidence: 99%

Training effects induced by cycling of magnetic field in ferromagnetic rich phase-separated nanocomposite manganites

Das

2015

Journal of Magnetism and Magnetic Materials

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Training effect by the applied magnetic field in the double-dopedPr0.5+0.5xCa0.5−0.5xMn1−x

Cited by 29 publications

References 18 publications

Metamagnetic phase transitions in perovskite manganites

Metamagnetic phase transitions in perovskite manganites

Spin Nematicity and Large Low‐Field Positive Magnetoresistance in a Half‐Doped Manganite: An Approach Exploiting Cation Size Disorder

Training effects induced by cycling of magnetic field in ferromagnetic rich phase-separated nanocomposite manganites

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