Magnetic Properties of a UPtAl Single Crystal

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概要

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• UPtAl is a ferroraaagnet xvith 21 spontaneous taa?tgnetic nuouaaent Al. : 1.38 p.5 /['.tr. directed alongthe hexagonal c axis and Ctrrie tetnperatvrre T0: 43.5 K. Tlae trniaxial magrnetocrystallitueanisotropy is very strong, tlae estitaaated stnisotropy field B.. exceeds 290 T. In a thertaaallydetnagraetized sar'taple tlae initial strsceptibility along the c axis is xrery IOXV for a xvide field interxr?tlbelow a critical field B.j.. Then the taaagnetization iuacreases ?tbrtrptly and sattrrates in ;x r?tthernarrow field interval, The low-temperattrre hysteresis loop is altarost rect;tngtrlstr xx'ith a 100%remanent magnetization. The coercivity (B. : O.7T at l.7K) w'eakens rapidly xvith increasingtenaperature and vanishes at 20 K. A zero-field cooled sanaaple exhibits a latrge tl?erun?tI ltysteresis.In the vicinity of' B.g and B., a very pronotrnced taastgnetic viscosity is observed. As the uaaainrnechanisna of tlae magnetic hysteresis xve jcrojoose the pinning of' doraaain walls xvhich 21I'C verynarrow dtte to tlae htrge atnisotropy and a reltttively xveak exchange interaction. The strsceptibilityas a f'trnction of' tertaperattrre in param?agnetic range obeys a Cturie-XVeiss l?tw xvith ar? efl'ectixreraaagnetic tnonaetat jt.? : 2.85 p.? /f.v+. The p?tratau?ngtuetic Ctrrie teuauperattrres O, observed in fieldsapplied atlong the a- and the c-axis dif['er consideratbly ( -375 and 46 K, respectively) reflectiragthe fact that the huge trni?txial magnetic anisotropy persists in pararnagnetic st?tte. The electricalresistivity of UPtAl is rsrther isotropic. The large rraagnetic contribtttion to resistivity is dtre toa strong inter'action of condtrction-electron states with tlae narroxv 57'-band st?ttes resjconsib[efor U magraetic nuoraaents in UPtAl. Up to T : 30 K, the tetaaperattrre dependence of resistivityobeys a qtradratic laxv p(T) o pg -p AT' xvitla A : 0.061 p.Q- ctaa/K'. UPtAl laas an enhancedelectronic specific-heat coefficient 7 : 69l11J/11101-K'. The correlation between A ;'tncl y fits tothe Kadowaki-NX7oods plot.

• 社団法人日本物理学会の論文
• 1999-07-15

著者

• Nikolai V.

  Issp Tokyo University:institute Of Metal Physics

• Sechovsky Vladimir

  Faculty Of Mathematics And Physics Charles University

• Homma Y

  Imr Tohoku University

• Shiokawa Yoshinobu

  Imr Tohoku University

• Alexander V.

  Institute of Physics,ASCR

• Alexander V.

  Institute Of Physics Ascr:imr Tohoku University

• Alexander V.

  Institute Of Physics Ascr

• Andreev Alexander

  Institute For Laser Physics

• Goto Tsuneaki

  Issp Tokyo University

• SHIOKAWA Yoshinobu

  IMR,Tohoku University

• TOMIDA Michihisa

  IMR,Tohoku University

• HOMMA Yoshiya

  IMR,Tohoku University

• Nikolai V.

  ISSP,Tokyo University

• GOTO Tsuneaki

  ISSP,Tokyo University

• Tomida Michihisa

  Imr Tohoku University

関連論文

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• Metamagnetic-Like Anomalies in f-Electron Systems Investigated by Specific Heat Measurements
• Magnetic Properties of a UPtAl Single Crystal
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• Simulation of laser plasma emission characteristics of small solid particles in different gas atmospheres at various pressures
• Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs
• Suprathermal Electron Generation by an Ultraintensive Laser Pulse in Foil Plasmas
• Fast Ion Bunch Generation by Ultraintense Laser Pulse on Plasma Foil Target

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